Co–Ti system

246 accepted literature values from 5 paper(s) (experimental 130, model 96, unspecified 20); 6 calculated phase diagram(s). 29 further extracted value(s) not accepted by the reader-agreement checks are only in the JSON/CSV.

Data: JSON · CSV · interactive explorer · interactive phase diagram · phases (9) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence classValues
experimental130
model96
unspecified20
Accepted values by property group
Property groupValues
invariant reaction121
phase transition62
phase equilibrium29
formation24
mixing / partial2
crystal structure8

Calculated phase diagrams

Binary phase diagrams calculated with pycalphad 0.11.2 from the SGTE binary collection (Hallstedt 2025, CC BY 4.0). Evidence class: model.

Assessments with a calculated phase diagram
TDB fileAssessmentSHA-256Links
CoTi-00Cac.tdbG. Cacciamani, R. Ferro, I. Ansara, N. Dupin, Intermetallics, 8, 213-22(2000). doi:10.1016/S0966-9795(99)00098-96fb1ebbac943b8ac5c4dcb1d4488dd0d30aa697cc6bbcbb24510f39d0b3d601aviewer · TDB · JSON
CoTi-01Dav-LB.tdbA.V. Davydov, U.R. Kattner, D. Josell, J.E. Blendell, R.M. Waterstrat, A.J. Shapiro, W.J. Boettinger, Metall. Mater. Trans. A, 32A, 2175-86(2001). doi:10.1007/s11661-001-0193-8b8589e70960bb0536f312ac559d8050bf9903bf086f54899ec00bd2f7ead4f96viewer · TDB · JSON
CoTi-18Zho.tdbC. Zhou, C. Guo, C. Li, Z. Du, Calphad, 63, 61-76(2018). doi:10.1016/j.calphad.2018.08.011647d0f8bf6e642c136196098e2ed8d70b3006822f8fb8b5801715c81f5b7c39aviewer · TDB · JSON
CoTi-20Wu.tdbL. Wu, Y. Zeng, Y. Pan, Y. Du, Y. Peng, H. Li, S. Liu, L. Zhang, L. Liu, J. Chem. Thermodyn., 142, 105995(2020). doi:10.1016/j.jct.2019.105995c8f2189ee1f4e5d7b0382210e6560ef3445239a697343d6adba9e56c97e8d909viewer · TDB · JSON
CoTi-22Yan.tdbH. Yang, C. Zhou, H. Wang, B. Yang, J. Iron Steel Res. Int., 29, 914-24(2022). doi:10.1007/s42243-021-00736-618ac015ba2b74def3a35755c0e7e0be6f2be897fe5ec0f5a8e87b0201c723900viewer · TDB · JSON
CoTi-24Tur.tdbM. Turchanin, P. Agraval, A. Vodopyanova, L. Dreval, J. Phase Equilib. Diffus., 45, 434-46(2024). doi:10.1007/s11669-024-01094-y8e8ceb6778fdc32a527cd6d7deeecda5af19d85baf8093eaf18f3bf9e316865dviewer · TDB · JSON
Calculated three-phase invariants (model, mole fraction of the second component)
TDB fileT (K)Phases at the invariant
CoTi-00Cac.tdb1492.12LIQUID (x(Ti) 0.29841) + C15_LAVES (x(Ti) 0.32456) + B2_BCC (x(Ti) 0.41482)
CoTi-00Cac.tdb1483.52LIQUID (x(Ti) 0.28129) + C36_LAVES (x(Ti) 0.31368) + C15_LAVES (x(Ti) 0.32127)
CoTi-00Cac.tdb1470.95FCC_A1#2 (x(Ti) 0.1329) + FCC_A1 (x(Ti) 0.13702) + LIQUID (x(Ti) 0.21226)
CoTi-00Cac.tdb1470.95L12_FCC (x(Ti) 0.1329) + FCC_A1 (x(Ti) 0.13702) + LIQUID (x(Ti) 0.21226)
CoTi-00Cac.tdb1455.8FCC_A1 (x(Ti) 0.14354) + L12_FCC (x(Ti) 0.20989) + LIQUID (x(Ti) 0.22014)
CoTi-00Cac.tdb1453.62L12_FCC (x(Ti) 0.23115) + LIQUID (x(Ti) 0.23762) + C36_LAVES (x(Ti) 0.2935)
CoTi-00Cac.tdb1413.66FCC_A1 (x(Ti) 0.13253) + FCC_A1#2 (x(Ti) 0.13737) + L12_FCC (x(Ti) 0.20556)
CoTi-00Cac.tdb1413.66L12_FCC#2 (x(Ti) 0.13253) + FCC_A1 (x(Ti) 0.13737) + L12_FCC (x(Ti) 0.20556)
CoTi-00Cac.tdb1324.6B2_BCC (x(Ti) 0.52436) + COTI2 (x(Ti) 0.66667) + LIQUID (x(Ti) 0.73414)
CoTi-00Cac.tdb1285.84COTI2 (x(Ti) 0.66667) + LIQUID (x(Ti) 0.76791) + B2_BCC (x(Ti) 0.8803)
CoTi-00Cac.tdb945.84COTI2 (x(Ti) 0.66667) + B2_BCC (x(Ti) 0.92923) + HCP_A3 (x(Ti) 0.98681)
CoTi-00Cac.tdb694.99HCP_A3 (x(Ti) 0) + FCC_A1 (x(Ti) 0) + L12_FCC (x(Ti) 0)
CoTi-00Cac.tdb593.41HCP_A3 (x(Ti) 3.000e-5) + FCC_A1 (x(Ti) 0.01015) + L12_FCC (x(Ti) 0.24721)
CoTi-00Cac.tdb593.41HCP_A3 (x(Ti) 3.000e-5) + L12_FCC (x(Ti) 0.01015) + L12_FCC#2 (x(Ti) 0.24721)
CoTi-00Cac.tdb589.33L12_FCC (x(Ti) 0.24995) + C36_LAVES (x(Ti) 0.31737) + C15_LAVES (x(Ti) 0.33327)
CoTi-01Dav-LB.tdb1509.3LIQUID (x(Ti) 0.28448) + C15_LAVES (x(Ti) 0.32591) + B2_BCC (x(Ti) 0.42946)
CoTi-01Dav-LB.tdb1509.3LIQUID (x(Ti) 0.28448) + C15_LAVES (x(Ti) 0.32591) + B2_BCC (x(Ti) 0.42946)
CoTi-01Dav-LB.tdb1474.68LIQUID (x(Ti) 0.25209) + C36_LAVES (x(Ti) 0.30945) + C15_LAVES (x(Ti) 0.32007)
CoTi-01Dav-LB.tdb1460.56LIQUID (x(Ti) 0.24032) + L12_FCC (x(Ti) 0.24222) + C36_LAVES (x(Ti) 0.30413)
CoTi-01Dav-LB.tdb1458.33FCC_A1 (x(Ti) 0.15242) + L12_FCC (x(Ti) 0.19384) + LIQUID (x(Ti) 0.20005)
CoTi-01Dav-LB.tdb1458.33L12_FCC#2 (x(Ti) 0.15242) + L12_FCC (x(Ti) 0.19384) + LIQUID (x(Ti) 0.20005)
CoTi-01Dav-LB.tdb1333.02B2_BCC (x(Ti) 0.52326) + COTI2 (x(Ti) 0.66667) + LIQUID (x(Ti) 0.76195)
CoTi-01Dav-LB.tdb1333.02B2_BCC (x(Ti) 0.52326) + COTI2 (x(Ti) 0.66667) + LIQUID (x(Ti) 0.76195)
CoTi-01Dav-LB.tdb1292.6COTI2 (x(Ti) 0.66667) + LIQUID (x(Ti) 0.78651) + B2_BCC (x(Ti) 0.85464)
CoTi-01Dav-LB.tdb1292.6COTI2 (x(Ti) 0.66667) + LIQUID (x(Ti) 0.78656) + B2_BCC (x(Ti) 0.8547)
CoTi-01Dav-LB.tdb958.96COTI2 (x(Ti) 0.66667) + B2_BCC (x(Ti) 0.93023) + HCP_A3 (x(Ti) 0.98059)
CoTi-01Dav-LB.tdb958.96COTI2 (x(Ti) 0.66667) + B2_BCC (x(Ti) 0.93032) + HCP_A3 (x(Ti) 0.98062)
CoTi-01Dav-LB.tdb694.99HCP_A3 (x(Ti) 0) + FCC_A1 (x(Ti) 0) + L12_FCC (x(Ti) 0)
CoTi-01Dav-LB.tdb674.51L12_FCC (x(Ti) 0.24998) + C36_LAVES (x(Ti) 0.32228) + C15_LAVES (x(Ti) 0.33306)
CoTi-01Dav-LB.tdb668.99L12_FCC (x(Ti) 0.24998) + C15_LAVES (x(Ti) 0.33309) + B2_BCC (x(Ti) 0.49299)
CoTi-01Dav-LB.tdb668.99L12_FCC (x(Ti) 0.24998) + C15_LAVES (x(Ti) 0.33309) + B2_BCC (x(Ti) 0.49299)
CoTi-01Dav-LB.tdb652.65HCP_A3 (x(Ti) 1.900e-4) + FCC_A1 (x(Ti) 0.00471) + L12_FCC (x(Ti) 0.24951)
CoTi-01Dav-LB.tdb652.65HCP_A3 (x(Ti) 1.900e-4) + L12_FCC (x(Ti) 0.00471) + L12_FCC#2 (x(Ti) 0.24951)
CoTi-18Zho.tdb1507.01LIQUID (x(Ti) 0.28352) + C15_LAVES (x(Ti) 0.32578) + B2_BCC (x(Ti) 0.42852)
CoTi-18Zho.tdb1507.01LIQUID (x(Ti) 0.28352) + C15_LAVES (x(Ti) 0.32578) + B2_BCC (x(Ti) 0.42852)
CoTi-18Zho.tdb1474.7LIQUID (x(Ti) 0.2521) + C36_LAVES (x(Ti) 0.30945) + C15_LAVES (x(Ti) 0.32007)
CoTi-18Zho.tdb1460.43LIQUID (x(Ti) 0.23959) + L12_FCC (x(Ti) 0.24164) + C36_LAVES (x(Ti) 0.30368)
CoTi-18Zho.tdb1458.34FCC_A1 (x(Ti) 0.15242) + L12_FCC (x(Ti) 0.19384) + LIQUID (x(Ti) 0.20004)
CoTi-18Zho.tdb1334.09B2_BCC (x(Ti) 0.52254) + COTI2 (x(Ti) 0.66667) + LIQUID (x(Ti) 0.76121)
CoTi-18Zho.tdb1334.09B2_BCC (x(Ti) 0.52254) + COTI2 (x(Ti) 0.66667) + LIQUID (x(Ti) 0.76121)
CoTi-18Zho.tdb1292.6COTI2 (x(Ti) 0.66667) + LIQUID (x(Ti) 0.78651) + B2_BCC (x(Ti) 0.85464)
CoTi-18Zho.tdb1292.6COTI2 (x(Ti) 0.66667) + LIQUID (x(Ti) 0.78656) + B2_BCC (x(Ti) 0.8547)
CoTi-18Zho.tdb958.96COTI2 (x(Ti) 0.66667) + B2_BCC (x(Ti) 0.93032) + HCP_A3 (x(Ti) 0.98062)
CoTi-18Zho.tdb663.32HCP_A3 (x(Ti) 1.500e-4) + FCC_A1 (x(Ti) 0.00352) + L12_FCC (x(Ti) 0.24964)
CoTi-18Zho.tdb638.32L12_FCC (x(Ti) 0.25) + C36_LAVES (x(Ti) 0.32272) + C15_LAVES (x(Ti) 0.33325)
CoTi-18Zho.tdb602.07L12_FCC (x(Ti) 0.25) + C15_LAVES (x(Ti) 0.3333) + B2_BCC (x(Ti) 0.49568)
CoTi-18Zho.tdb602.07L12_FCC (x(Ti) 0.25) + C15_LAVES (x(Ti) 0.3333) + B2_BCC (x(Ti) 0.49568)
CoTi-20Wu.tdb1505.89LIQUID (x(Ti) 0.28626) + C15_LAVES (x(Ti) 0.32623) + B2_BCC (x(Ti) 0.4321)
CoTi-20Wu.tdb1473.2LIQUID (x(Ti) 0.25047) + C36_LAVES (x(Ti) 0.30922) + C15_LAVES (x(Ti) 0.31983)
CoTi-20Wu.tdb1442.68FCC_A1 (x(Ti) 0.15156) + L12_FCC (x(Ti) 0.19252) + LIQUID (x(Ti) 0.20587)
CoTi-20Wu.tdb1442.68L12_FCC#2 (x(Ti) 0.15156) + L12_FCC (x(Ti) 0.19252) + LIQUID (x(Ti) 0.20587)
CoTi-20Wu.tdb1439.81L12_FCC (x(Ti) 0.21799) + LIQUID (x(Ti) 0.22134) + C36_LAVES (x(Ti) 0.29442)
CoTi-20Wu.tdb1333.5B2_BCC (x(Ti) 0.52131) + COTI2 (x(Ti) 0.66667) + LIQUID (x(Ti) 0.75903)
CoTi-20Wu.tdb1282.88COTI2 (x(Ti) 0.66667) + LIQUID (x(Ti) 0.78938) + B2_BCC (x(Ti) 0.85943)
CoTi-20Wu.tdb1282.88COTI2 (x(Ti) 0.66667) + LIQUID (x(Ti) 0.78943) + B2_BCC (x(Ti) 0.85948)
CoTi-20Wu.tdb961.64COTI2 (x(Ti) 0.66667) + B2_BCC (x(Ti) 0.93112) + HCP_A3 (x(Ti) 0.98092)
CoTi-20Wu.tdb961.64COTI2 (x(Ti) 0.66667) + B2_BCC (x(Ti) 0.93113) + HCP_A3 (x(Ti) 0.98092)
CoTi-20Wu.tdb762.02L12_FCC (x(Ti) 0.24998) + C36_LAVES (x(Ti) 0.32187) + C15_LAVES (x(Ti) 0.3328)
CoTi-20Wu.tdb673.65HCP_A3 (x(Ti) 6.000e-5) + FCC_A1 (x(Ti) 0.00232) + L12_FCC (x(Ti) 0.24981)
CoTi-20Wu.tdb673.65HCP_A3 (x(Ti) 6.000e-5) + L12_FCC#2 (x(Ti) 0.00232) + L12_FCC (x(Ti) 0.24981)
CoTi-20Wu.tdb378.69L12_FCC (x(Ti) 0.25) + C15_LAVES (x(Ti) 0.33333) + B2_BCC (x(Ti) 0.5)
CoTi-22Yan.tdb1524.39LIQUID (x(Ti) 0.30204) + C15_LAVES (x(Ti) 0.34062) + B2_BCC (x(Ti) 0.43474)
CoTi-22Yan.tdb1494.68LIQUID (x(Ti) 0.27052) + C36_LAVES (x(Ti) 0.32593) + C15_LAVES (x(Ti) 0.33429)
CoTi-22Yan.tdb1432.94FCC_A1 (x(Ti) 0.15423) + L12_FCC (x(Ti) 0.19315) + LIQUID (x(Ti) 0.20334)
CoTi-22Yan.tdb1430.95L12_FCC (x(Ti) 0.22341) + LIQUID (x(Ti) 0.22398) + C36_LAVES (x(Ti) 0.31449)
CoTi-22Yan.tdb1323.3B2_BCC (x(Ti) 0.51264) + COTI2 (x(Ti) 0.66667) + LIQUID (x(Ti) 0.75274)
CoTi-22Yan.tdb1301.86COTI2 (x(Ti) 0.66667) + LIQUID (x(Ti) 0.76899) + B2_BCC (x(Ti) 0.87518)
CoTi-22Yan.tdb1301.86COTI2 (x(Ti) 0.66667) + LIQUID (x(Ti) 0.76903) + B2_BCC (x(Ti) 0.87523)
CoTi-22Yan.tdb963.85COTI2 (x(Ti) 0.66667) + B2_BCC (x(Ti) 0.92871) + HCP_A3 (x(Ti) 0.97858)
CoTi-22Yan.tdb963.85COTI2 (x(Ti) 0.66667) + B2_BCC (x(Ti) 0.92875) + HCP_A3 (x(Ti) 0.97859)
CoTi-22Yan.tdb645.34HCP_A3 (x(Ti) 2.000e-5) + FCC_A1 (x(Ti) 0.0056) + L12_FCC (x(Ti) 0.24955)
CoTi-22Yan.tdb645.34HCP_A3 (x(Ti) 2.000e-5) + FCC_A1 (x(Ti) 0.0056) + L12_FCC (x(Ti) 0.24955)
CoTi-24Tur.tdb1521.31LIQUID (x(Ti) 0.30194) + C15_LAVES (x(Ti) 0.34044) + B2_BCC (x(Ti) 0.43028)
CoTi-24Tur.tdb1521.31LIQUID (x(Ti) 0.30194) + C15_LAVES (x(Ti) 0.34044) + B2_BCC (x(Ti) 0.43028)
CoTi-24Tur.tdb1494.67LIQUID (x(Ti) 0.27768) + C36_LAVES (x(Ti) 0.32202) + C15_LAVES (x(Ti) 0.33308)
CoTi-24Tur.tdb1435.12FCC_A1 (x(Ti) 0.1374) + L12_FCC (x(Ti) 0.20804) + LIQUID (x(Ti) 0.22473)
CoTi-24Tur.tdb1435.12L12_FCC#2 (x(Ti) 0.1374) + L12_FCC (x(Ti) 0.20804) + LIQUID (x(Ti) 0.22473)
CoTi-24Tur.tdb1433.94L12_FCC (x(Ti) 0.21367) + LIQUID (x(Ti) 0.22872) + C36_LAVES (x(Ti) 0.30212)
CoTi-24Tur.tdb1321B2_BCC (x(Ti) 0.51854) + COTI2 (x(Ti) 0.66667) + LIQUID (x(Ti) 0.72913)
CoTi-24Tur.tdb1321B2_BCC (x(Ti) 0.51854) + COTI2 (x(Ti) 0.66667) + LIQUID (x(Ti) 0.72913)
CoTi-24Tur.tdb1304.65COTI2 (x(Ti) 0.66667) + LIQUID (x(Ti) 0.73964) + B2_BCC (x(Ti) 0.86093)
CoTi-24Tur.tdb966.36COTI2 (x(Ti) 0.66667) + B2_BCC (x(Ti) 0.92554) + HCP_A3 (x(Ti) 0.97587)
CoTi-24Tur.tdb966.35COTI2 (x(Ti) 0.66667) + B2_BCC (x(Ti) 0.9256) + HCP_A3 (x(Ti) 0.97589)
CoTi-24Tur.tdb694.99HCP_A3 (x(Ti) 0) + FCC_A1 (x(Ti) 0) + L12_FCC (x(Ti) 0)
CoTi-24Tur.tdb631.64HCP_A3 (x(Ti) 1.000e-5) + FCC_A1 (x(Ti) 0.00748) + L12_FCC (x(Ti) 0.24245)
CoTi-24Tur.tdb631.64HCP_A3 (x(Ti) 1.000e-5) + L12_FCC (x(Ti) 0.00748) + L12_FCC#2 (x(Ti) 0.24245)
CoTi-24Tur.tdb631.64HCP_A3 (x(Ti) 1.000e-5) + FCC_A1 (x(Ti) 0.00748) + L12_FCC (x(Ti) 0.24246)
CoTi-24Tur.tdb372.78L12_FCC (x(Ti) 0.25) + C36_LAVES (x(Ti) 0.33259) + C15_LAVES (x(Ti) 0.33333)

Convex hulls: Materials Project DFT hull · OQMD DFT hull · CALPHAD hull CoTi-00Cac · CALPHAD hull CoTi-01Dav-LB · CALPHAD hull CoTi-18Zho · CALPHAD hull CoTi-20Wu · CALPHAD hull CoTi-22Yan

Invariant reactions (literature)

Invariant reactions reported in the literature for the Co–Ti system (121)
T (K)Reaction / phasesCompositions (mole fraction)ClassSourceLocationQuote
1793.15congruent melting: Liquid -> B2L: Co 0.507; B2: Co 0.507experimental[1] Wu 2020
cites Petkov 2020		Table 8, p. 9, row 13
report
1778congruent melting: liquid ↔ CoTiliquid: Ti 0.5; CoTi: Ti 0.5unspecified[2] Yang 2022
cites Stein 2019 doi		Table 5, p. 8, row 18
report
1777congruent melting: liquid ↔ CoTiliquid: Ti 0.496; CoTi: Ti 0.496model[2] Yang 2022Table 5, p. 8, row 19
report
1776congruent melting: liquid ↔ CoTiliquid: Co 0.5, Ti 0.5; CoTi: Co 0.5, Ti 0.5unspecified[2] Yang 2022
cites Davydov 2001 doi		Table 5, p. 8, row 17
report
1774.15congruent melting: Liquid -> B2L: Co 0.504; B2: Co 0.504experimental[1] Wu 2020
cites Davydov 2001		Table 8, p. 9, row 12
report
1768.15congruent melting: Liquid -> B2L: Co 0.503; B2: Co 0.503unspecified[1] Wu 2020Table 8, p. 9, row 11
report
1598congruent melting: liquid ↔ CoTiliquid: Ti 0.5; CoTi: Ti 0.5experimental[2] Yang 2022
cites Murray 1982 doi		Table 5, p. 8, row 16
report
1524L + CoTi ⇄ C15L: Ti 0.302; CoTi: Ti 0.435; C15: Ti 0.341model[3] Turchanin 2024
cites Yang 2022 doi		Table 3, p. 9, row 42
report
1524liquid + CoTi ↔ β-Co2Tiliquid: Ti 0.302; CoTi: Ti 0.435; β-Co2Ti: Ti 0.341model[2] Yang 2022Table 5, p. 8, row 15
report
1524liquid + CoTi ↔ β-Co2TiCoTi: Co 0.5, Ti 0.5; β-Co2Ti: Co 0.666667, Ti 0.333333unspecified[2] Yang 2022
cites Stein 2019 doi		Table 5, p. 8, row 14
report
1524L + CoTi ⇄ C15L: Ti 0.335; CoTi: Ti 0.44; C15: Ti 0.339experimental[3] Turchanin 2024
cites Stein 2019 doi		Table 3, p. 9, row 38
report
1522L + CoTi ⇄ C15L: Ti 0.302; CoTi: Ti 0.43; C15: Ti 0.34model[3] Turchanin 2024Table 3, p. 9, row 43
report
1515B2 + liquid = C15B2: Ti 0.44; L: Ti 0.293; C15: Ti 0.327model[4] Davydov 2001Table VI, p. 11, row 12
report
1509B2 + liquid = C15B2: Ti 0.43; L: Ti 0.285; C15: Ti 0.326model[4] Davydov 2001Table VI, p. 11, row 11
report
1509L + CoTi ⇄ C15L: Ti 0.285; CoTi: Ti 0.43; C15: Ti 0.326model[3] Turchanin 2024
cites Davydov 2001 doi		Table 3, p. 9, row 40
report
1508.15Liquid + B2 -> C15L: Co 0.697; B2: Co 0.587; C15: Co 0.666experimental[1] Wu 2020
cites Petkov 2020		Table 8, p. 9, row 10
report
1508Liquid + B2->C15Liquid: Ti 0.328; B2: Ti 0.448; C15: Ti 0.335experimental[5] Cacciamani 2000
cites Murray 1987		Table 4, p. 7, row 7
report
1508L + CoTi ⇄ C15L: Ti 0.303; CoTi: Ti 0.413; C15: Ti 0.334experimental[3] Turchanin 2024
cites Petkov 1971		Table 3, p. 9, row 37
report
1508liquid + CoTi ↔ β-Co2Tiliquid: Ti 0.338; CoTi: Ti 0.448; β-Co2Ti: Ti 0.345experimental[2] Yang 2022
cites Murray 1982 doi		Table 5, p. 8, row 12
report
1508B2 + liquid = C15B2: Ti 0.448; L: Ti 0.328; C15: Ti 0.335model[4] Davydov 2001
cites Murray 1987 doi		Table VI, p. 11, row 13
report
1506.15Liquid + B2 -> C15L: Co 0.714; B2: Co 0.568; C15: Co 0.674unspecified[1] Wu 2020Table 8, p. 9, row 9
report
1506L + CoTi ⇄ C15L: Ti 0.286; CoTi: Ti 0.432; C15: Ti 0.326model[3] Turchanin 2024
cites Wu 2020 doi		Table 3, p. 9, row 41
report
1496L + C15 ⇄ C36L: Ti 0.285; C15: Ti 0.333; C36: Ti 0.331experimental[3] Turchanin 2024
cites Stein 2019 doi		Table 3, p. 9, row 31
report
1496liquid + β-Co2Ti ↔ γ-Co2Tiβ-Co2Ti: Co 0.666667, Ti 0.333333unspecified[2] Yang 2022
cites Stein 2019 doi		Table 5, p. 8, row 10
report
1495liquid + β-Co2Ti ↔ γ-Co2Tiliquid: Ti 0.271; β-Co2Ti: Ti 0.334; γ-Co2Ti: Ti 0.326model[2] Yang 2022Table 5, p. 8, row 11
report
1495L + C15 ⇄ C36L: Ti 0.271; C15: Ti 0.334; C36: Ti 0.326model[3] Turchanin 2024
cites Yang 2022 doi		Table 3, p. 9, row 35
report
1494L + C15 ⇄ C36L: Ti 0.277; C15: Ti 0.333; C36: Ti 0.322model[3] Turchanin 2024Table 3, p. 9, row 36
report
1492Liquid + B2->C15Liquid: Ti 0.298; B2: Ti 0.414; C15: Ti 0.325model[5] Cacciamani 2000Table 4, p. 7, row 8
report
1492L + CoTi ⇄ C15L: Ti 0.298; CoTi: Ti 0.414; C15: Ti 0.325model[3] Turchanin 2024
cites Cacciamani 2000 doi		Table 3, p. 9, row 39
report
1484L + C15 ⇄ C36L: Ti 0.281; C15: Ti 0.321; C36: Ti 0.314model[3] Turchanin 2024
cites Cacciamani 2000 doi		Table 3, p. 9, row 32
report
1484Liquid + C15->C36Liquid: Ti 0.281; C15: Ti 0.321; C36: Ti 0.314model[5] Cacciamani 2000Table 4, p. 7, row 10
report
1483.15Liquid + A1 -> L12L: Co 0.817; A1: Co 0.793; L12: Co 0.855experimental[1] Wu 2020
cites Petkov 2020		Table 8, p. 9, row 3
report
1483.15Liquid + C15 -> C36L: Co 0.725; C15: Co 0.668; C36: Co 0.695experimental[1] Wu 2020
cites Petkov 2020		Table 8, p. 9, row 8
report
1483Liquid + C15->C36Liquid: Ti 0.29; C15: Ti 0.33; C36: Ti 0.312experimental[5] Cacciamani 2000
cites Murray 1987		Table 4, p. 7, row 9
report
1483liquid + α-Co ↔ Co3Tiliquid: Ti 0.195; α-Co: Ti 0.144; Co3Ti: Ti 0.191experimental[2] Yang 2022
cites Murray 1982 doi		Table 5, p. 8, row 1
report
1483L + (αCo) ⇄ Co3TiL: Ti 0.207; (αCo): Ti 0.145; Co3Ti: Ti 0.183experimental[3] Turchanin 2024
cites Petkov 1971		Table 3, p. 9, row 14
report
1483L + C15 ⇄ C36L: Ti 0.275; C15: Ti 0.332; C36: Ti 0.305experimental[3] Turchanin 2024
cites Petkov 1971		Table 3, p. 9, row 30
report
1483C15 + liquid = C36C15: Ti 0.33; L: Ti 0.29; C36: Ti 0.313model[4] Davydov 2001
cites Murray 1987 doi		Table VI, p. 11, row 15
report
1483Liquid + A1 = L12L: Ti 0.207; A1: Ti 0.141; L12: Ti 0.193model[4] Davydov 2001
cites Murray 1987 doi		Table VI, p. 11, row 20
report
1483liquid + β-Co2Ti ↔ γ-Co2Tiliquid: Ti 0.29; β-Co2Ti: Ti 0.344; γ-Co2Ti: Ti 0.313experimental[2] Yang 2022
cites Murray 1982 doi		Table 5, p. 8, row 9
report
1475C15 + liquid = C36C15: Ti 0.32; L: Ti 0.252; C36: Ti 0.309model[4] Davydov 2001Table VI, p. 11, row 14
report
1475L + C15 ⇄ C36L: Ti 0.252; C15: Ti 0.32; C36: Ti 0.309model[3] Turchanin 2024
cites Davydov 2001 doi		Table 3, p. 9, row 33
report
1473.15Liquid + C15 -> C36L: Co 0.75; C15: Co 0.68; C36: Co 0.691unspecified[1] Wu 2020Table 8, p. 9, row 7
report
1473L + C15 ⇄ C36L: Ti 0.25; C15: Ti 0.32; C36: Ti 0.309model[3] Turchanin 2024
cites Wu 2020 doi		Table 3, p. 9, row 34
report
1463Liquid + A1->L12Liquid: Ti 0.193; A1: Ti 0.207; L12: Ti 0.141experimental[5] Cacciamani 2000
cites Murray 1987		Table 4, p. 7, row 13
report
1459C36 + liquid = L12C36: Ti 0.303; L: Ti 0.239; L12: Ti 0.242model[4] Davydov 2001Table VI, p. 11, row 16
report
1459L ⇄ Co3Ti + C36L: Ti 0.239; Co3Ti: Ti 0.242; C36: Ti 0.303model[3] Turchanin 2024
cites Davydov 2001 doi		Table 3, p. 9, row 26
report
1455Liquid + A1 = L12L: Ti 0.202; A1: Ti 0.154; L12: Ti 0.2model[4] Davydov 2001Table VI, p. 11, row 19
report
1455Liquid + A1->L12Liquid: Ti 0.211; A1: Ti 0.22; L12: Ti 0.144model[5] Cacciamani 2000Table 4, p. 7, row 14
report
1455L + (αCo) ⇄ Co3TiL: Ti 0.202; (αCo): Ti 0.154; Co3Ti: Ti 0.2model[3] Turchanin 2024
cites Davydov 2001 doi		Table 3, p. 9, row 18
report
1455L + (αCo) ⇄ Co3TiL: Ti 0.211; (αCo): Ti 0.144; Co3Ti: Ti 0.22model[3] Turchanin 2024
cites Cacciamani 2000 doi		Table 3, p. 9, row 17
report
1453L ⇄ Co3Ti + C36L: Ti 0.231; Co3Ti: Ti 0.237; C36: Ti 0.293model[3] Turchanin 2024
cites Cacciamani 2000 doi		Table 3, p. 9, row 25
report
1453eutectic: Liquid->C36 + L12Liquid: Ti 0.231; C36: Ti 0.293; L12: Ti 0.237model[5] Cacciamani 2000Table 4, p. 7, row 12
report
1443.15eutectic: Liquid -> C36 + L12L: Co 0.77; C36: Co 0.709; L12: Co 0.781experimental[1] Wu 2020
cites Petkov 2020		Table 8, p. 9, row 6
report
1443L ⇄ Co3Ti + C36L: Ti 0.23; Co3Ti: Ti 0.219; C36: Ti 0.291experimental[3] Turchanin 2024
cites Petkov 1971		Table 3, p. 9, row 22
report
1443C36 + liquid = L12C36: Ti 0.28; L: Ti 0.228; L12: Ti 0.242model[4] Davydov 2001
cites Murray 1987 doi		Table VI, p. 11, row 17
report
1443eutectic: Liquid->C36 + L12Liquid: Ti 0.242; C36: Ti 0.28; L12: Ti 0.228experimental[5] Cacciamani 2000
cites Murray 1987		Table 4, p. 7, row 11
report
1443liquid ↔ Co3Ti + γ-Co2Tiliquid: Ti 0.242; Co3Ti: Ti 0.227; γ-Co2Ti: Ti 0.313experimental[2] Yang 2022
cites Murray 1982 doi		Table 5, p. 8, row 5
report
1439.15Liquid + A1 -> L12L: Co 0.801; A1: Co 0.793; L12: Co 0.847unspecified[1] Wu 2020Table 8, p. 9, row 1
report
1439L + (αCo) ⇄ Co3TiL: Ti 0.207; (αCo): Ti 0.153; Co3Ti: Ti 0.199model[3] Turchanin 2024
cites Wu 2020 doi		Table 3, p. 9, row 19
report
1437.15eutectic: Liquid -> C36 + L12L: Co 0.78; C36: Co 0.707; L12: Co 0.782unspecified[1] Wu 2020Table 8, p. 9, row 4
report
1437L ⇄ Co3Ti + C36L: Ti 0.22; Co3Ti: Ti 0.218; C36: Ti 0.293model[3] Turchanin 2024
cites Wu 2020 doi		Table 3, p. 9, row 27
report
1434L + (αCo) ⇄ Co3TiL: Ti 0.225; (αCo): Ti 0.138; Co3Ti: Ti 0.21model[3] Turchanin 2024Table 3, p. 9, row 21
report
1433liquid + α-Co ↔ Co3Tiliquid: Ti 0.203; α-Co: Ti 0.154; Co3Ti: Ti 0.193model[2] Yang 2022Table 5, p. 8, row 4
report
1433L ⇄ Co3Ti + C36L: Ti 0.228; Co3Ti: Ti 0.214; C36: Ti 0.302model[3] Turchanin 2024Table 3, p. 9, row 29
report
1433L + (αCo) ⇄ Co3TiL: Ti 0.203; (αCo): Ti 0.154; Co3Ti: Ti 0.193model[3] Turchanin 2024
cites Yang 2022 doi		Table 3, p. 9, row 20
report
1431L ⇄ Co3Ti + C36L: Ti 0.24; Co3Ti: Ti 0.25; C36: Ti 0.293experimental[3] Turchanin 2024
cites Stein 2019 doi		Table 3, p. 9, row 23
report
1431L ⇄ Co3Ti + C36L: Ti 0.224; Co3Ti: Ti 0.223; C36: Ti 0.315model[3] Turchanin 2024
cites Yang 2022 doi		Table 3, p. 9, row 28
report
1431liquid ↔ Co3Ti + γ-Co2Tiliquid: Ti 0.224; Co3Ti: Ti 0.223; γ-Co2Ti: Ti 0.315model[2] Yang 2022Table 5, p. 8, row 8
report
1431liquid ↔ Co3Ti + γ-Co2TiCo3Ti: Co 0.75, Ti 0.25unspecified[2] Yang 2022
cites Stein 2019 doi		Table 5, p. 8, row 7
report
1429.15peritectic: L + A1(αCo) -> L12experimental[1] Wu 2020Table 4, p. 5, row 1
report
1429.15Liquid + A1 -> L12experimental[1] Wu 2020Table 8, p. 9, row 2
report
1429liquid + α-Co ↔ Co3TiCo3Ti: Co 0.75, Ti 0.25unspecified[2] Yang 2022
cites Wu 2020 doi		Table 5, p. 8, row 2
report
1429L + (αCo) ⇄ Co3TiCo3Ti: Ti 0.25experimental[3] Turchanin 2024
cites Wu 2020 doi		Table 3, p. 9, row 16
report
1428L + (αCo) ⇄ Co3TiL: Ti 0.23; (αCo): Ti 0.151; Co3Ti: Ti 0.215experimental[3] Turchanin 2024
cites Stein 2019 doi		Table 3, p. 9, row 15
report
1428liquid + α-Co ↔ Co3Tiliquid: Ti 0.215; α-Co: Ti 0.151; Co3Ti: Co 0.75, Ti 0.25unspecified[2] Yang 2022
cites Stein 2019 doi		Table 5, p. 8, row 3
report
1427.15eutectic: Liquid -> C36 + L12experimental[1] Wu 2020Table 8, p. 9, row 5
report
1427.15eutecticexperimental[1] Wu 2020p. 11
report		The invariant equilibrium among liquid, C36 and L12 is determined to be eutectic experimentally. The eutectic temperature has been determined to be 1154 °C by means of DSC technique.
1427.15eutectic: L -> L12 + C36experimental[1] Wu 2020Table 4, p. 5, row 2
report
1427liquid ↔ Co3Ti + γ-Co2TiCo3Ti: Co 0.75, Ti 0.25unspecified[2] Yang 2022
cites Wu 2020 doi		Table 5, p. 8, row 6
report
1427L ⇄ Co3Ti + C36Co3Ti: Ti 0.25experimental[3] Turchanin 2024
cites Wu 2020 doi		Table 3, p. 9, row 24
report
1427eutecticexperimental[2] Yang 2022p. 2
report		The invariant reaction among liquid, Co3Ti and c-Co2Ti was deduced to be a eutectic type with the temperature of 1427 ± 3 K.
1334.15Liquid + B2 -> E93L: Co 0.241; B2: Co 0.479; E93: Co 0.333unspecified[1] Wu 2020Table 8, p. 9, row 14
report
1333Liquid + B2 = CoTi2L: Ti 0.762; B2: Ti 0.523; CoTi2: Ti 0.667model[4] Davydov 2001Table VI, p. 11, row 5
report
1331Liquid + B2 = CoTi2L: Ti 0.729; B2: Ti 0.51; CoTi2: Ti 0.669model[4] Davydov 2001
cites Murray 1987 doi		Table VI, p. 11, row 7
report
1331Liquid + B2->CoTi2Liquid: Ti 0.729; B2: Ti 0.51; CoTi2: Ti 0.669experimental[5] Cacciamani 2000
cites Murray 1987		Table 4, p. 7, row 5
report
1331liquid + CoTi ↔ CoTi2liquid: Ti 0.729; CoTi: Ti 0.503; CoTi2: Ti 0.67experimental[2] Yang 2022
cites Murray 1982 doi		Table 5, p. 8, row 20
report
1330Liquid + B2 = CoTi2L: Ti 0.764; B2: Ti 0.522; CoTi2: Ti 0.667model[4] Davydov 2001Table VI, p. 11, row 6
report
1328.15Liquid + B2 -> E93L: Co 0.296; B2: Co 0.5; E93: Co 0.331experimental[1] Wu 2020
cites Orrell 1955		Table 8, p. 9, row 15
report
1323liquid + CoTi ↔ CoTi2CoTi: Co 0.5, Ti 0.5; CoTi2: Co 0.333333, Ti 0.666667experimental[2] Yang 2022Table 5, p. 8, row 21
report
1323liquid + CoTi ↔ CoTi2liquid: Ti 0.753; CoTi: Ti 0.513; CoTi2: Ti 0.667model[2] Yang 2022Table 5, p. 8, row 22
report
1323Liquid + B2->CoTi2Liquid: Ti 0.736; B2: Ti 0.528; CoTi2: Ti 0.667model[5] Cacciamani 2000Table 4, p. 7, row 6
report
1302liquid ↔ CoTi2 + β-Tiliquid: Ti 0.769; CoTi2: Ti 0.667; β-Ti: Ti 0.875model[2] Yang 2022Table 5, p. 8, row 26
report
1302liquid ↔ CoTi2 + β-TiCoTi2: Co 0.333333, Ti 0.666667experimental[2] Yang 2022Table 5, p. 8, row 25
report
1293.15eutectic: Liquid -> A2 + E93L: Co 0.27; A2: Co 0.17; E93: Co 0.329experimental[1] Wu 2020
cites Orrell 1955		Table 8, p. 9, row 17
report
1293eutectic: Liquid->A2 + CoTi2Liquid: Ti 0.768; A2: Ti 0.855; CoTi2: Ti 0.671experimental[5] Cacciamani 2000
cites Murray 1987		Table 4, p. 7, row 1
report
1293Liquid = A2 + CoTi2L: Ti 0.768; A2: Ti 0.855; CoTi2: Ti 0.669model[4] Davydov 2001
cites Murray 1987 doi		Table VI, p. 11, row 4
report
1293Liquid = A2 + CoTi2L: Ti 0.787; A2: Ti 0.855; CoTi2: Ti 0.667model[4] Davydov 2001Table VI, p. 11, row 3
report
1293liquid ↔ CoTi2 + β-Tiliquid: Ti 0.768; CoTi2: Ti 0.67; β-Ti: Ti 0.855experimental[2] Yang 2022
cites Murray 1982 doi		Table 5, p. 8, row 23
report
1288eutectic: Liquid->A2 + CoTi2Liquid: Ti 0.766; A2: Ti 0.88; CoTi2: Ti 0.667model[5] Cacciamani 2000Table 4, p. 7, row 2
report
1283.15eutectic: Liquid -> A2 + E93L: Co 0.211; A2: Co 0.14; E93: Co 0.333unspecified[1] Wu 2020Table 8, p. 9, row 16
report
967.15eutectoid: A2(βTi) -> A3(αTi) + E93E93: Co 0.333333, Ti 0.666667experimental[1] Wu 2020Table 4, p. 5, row 3
report
967.15A2 -> A3 + E93E93: Co 0.333333, Ti 0.666667experimental[1] Wu 2020Table 8, p. 9, row 19
report
967β-Ti ↔ CoTi2 + α-TiCoTi2: Co 0.333333, Ti 0.666667unspecified[2] Yang 2022
cites Wu 2020 doi		Table 5, p. 8, row 28
report
964β-Ti ↔ CoTi2 + α-Tiβ-Ti: Ti 0.929; CoTi2: Ti 0.667; α-Ti: Ti 0.979model[2] Yang 2022Table 5, p. 8, row 30
report
964β-Ti ↔ CoTi2 + α-TiCoTi2: Co 0.333333, Ti 0.666667experimental[2] Yang 2022Table 5, p. 8, row 29
report
959A2 = A3 + CoTi2A2: Ti 0.93; A3: Ti 0.981; CoTi2: Ti 0.667model[4] Davydov 2001Table VI, p. 11, row 1
report
958.15A2 -> A3 + E93A2: Co 0.069; A3: Co 0.019; E93: Co 0.333unspecified[1] Wu 2020Table 8, p. 9, row 18
report
958.15A2 -> A3 + E93A2: Co 0.095; A3: Co 0.009; E93: Co 0.332experimental[1] Wu 2020
cites Orrell 1955		Table 8, p. 9, row 20
report
958A2 = A3 + CoTi2A2: Ti 0.93; A3: Ti 0.991; CoTi2: Ti 0.668model[4] Davydov 2001
cites Murray 1987 doi		Table VI, p. 11, row 2
report
958A2->A3 + CoTi2A2: Ti 0.93; A3: Ti 0.991; CoTi2: Ti 0.668experimental[5] Cacciamani 2000
cites Murray 1987		Table 4, p. 7, row 3
report
958β-Ti ↔ CoTi2 + α-Tiβ-Ti: Ti 0.94; CoTi2: Ti 0.67; α-Ti: Ti 0.991experimental[2] Yang 2022
cites Murray 1982 doi		Table 5, p. 8, row 27
report
945A2->A3 + CoTi2A2: Ti 0.93; A3: Ti 0.987; CoTi2: Ti 0.667model[5] Cacciamani 2000Table 4, p. 7, row 4
report
673(αCo) ⇄ (εCo) + Co3TiCo3Ti: Ti 0.25experimental[3] Turchanin 2024
cites Murray 1982 doi		Table 3, p. 9, row 1
report
670(αCo) ⇄ (εCo) + Co3Ti(αCo): Ti 0.003; (εCo): Ti 3.000e-4; Co3Ti: Ti 0.25model[3] Turchanin 2024
cites Wu 2020 doi		Table 3, p. 9, row 4
report
646(αCo) ⇄ (εCo) + Co3Ti(αCo): Ti 0.006; (εCo): Ti 2.000e-4; Co3Ti: Ti 0.25model[3] Turchanin 2024
cites Davydov 2001 doi		Table 3, p. 9, row 3
report
645α-Co ↔ ε-Co + Co3Tiα-Co: Ti 0.001; ε-Co: Ti 0.001; Co3Ti: Ti 0.25model[2] Yang 2022Table 5, p. 8, row 31
report
642(αCo) ⇄ (εCo) + Co3Ti(αCo): Ti 0.001; (εCo): Ti 0.001; Co3Ti: Ti 0.25model[3] Turchanin 2024
cites Yang 2022 doi		Table 3, p. 9, row 5
report
640A1 = L12 + A3A1: Ti 0.006; L12: Ti 0.25; A3: Ti 2.000e-4model[4] Davydov 2001Table VI, p. 11, row 21
report
627(αCo) ⇄ (εCo) + Co3Ti(αCo): Ti 0.008; (εCo): Ti 6.000e-6; Co3Ti: Ti 0.246model[3] Turchanin 2024Table 3, p. 9, row 6
report
585(αCo) ⇄ (εCo) + Co3Ti(αCo): Ti 0.011; Co3Ti: Ti 0.248model[3] Turchanin 2024
cites Cacciamani 2000 doi		Table 3, p. 9, row 2
report

Formation enthalpies

Literature values in kJ/mol-atom where the per-atom basis is known. DFT columns: the lowest-energy entry at the same composition (Materials Project 2026.04.13, OQMD v1.8; different energy references, never averaged), from dft_parity.json.

Enthalpies of formation, Co–Ti system (19)
PhaseCompoundValueT (K)ClassMP DFT (kJ/mol-atom)OQMD DFT (kJ/mol-atom)SourceLocationQuote
B2-44.4 kJ/mol (basis unstated)298.15experimental[1] Wu 2020
cites Gomozov 1986		Table 7, p. 9, row 8
report
B2-44.3 kJ/mol (basis unstated)298.15experimental[1] Wu 2020
cites Gachon 1981 doi		Table 7, p. 9, row 6
report
B2-43.1256 kJ/mol (basis unstated)298.15model[1] Wu 2020Table 7, p. 9, row 5
report
B2-42.2 kJ/mol-atom298.15model[4] Davydov 2001Table I, p. 2, row 7
report
B2-42.2 kJ/mol-atom298.15model[4] Davydov 2001
cites Kaufman 1975 doi		Table I, p. 2, row 2
report
B2-42.177 kJ/mol-atom298.15model[4] Davydov 2001Table V, p. 10, row 4
report
B2-41.3 kJ/mol (basis unstated) ± 0.9298.15experimental[1] Wu 2020
cites Guo 1998 doi		Table 7, p. 9, row 7
report
B2-40.9 kJ/mol-atom298.15model[4] Davydov 2001
cites Cacciamani 2001		Table I, p. 2, row 6
report
B2-40.5 kJ/mol-atom298.15model[4] Davydov 2001
cites Nash 1998 doi		Table I, p. 2, row 5
report
B2-33.3 kJ/mol-atom298.15model[4] Davydov 2001
cites Murray 1987 doi		Table I, p. 2, row 1
report
C15-28.219 kJ/mol-atom298.15model[4] Davydov 2001Table V, p. 10, row 3
report
C36-27.246 kJ/mol-atom298.15model[4] Davydov 2001Table V, p. 10, row 2
report
Co2Ti-34.1 kJ/mol (basis unstated)298.15experimental[1] Wu 2020
cites Gachon 1981 doi		Table 7, p. 9, row 4
report
Co2Ti-32.2062 kJ/mol (basis unstated)298.15model[1] Wu 2020Table 7, p. 9, row 3
report
CoTi2-33.8676 kJ/mol (basis unstated)298.15model[1] Wu 2020Table 7, p. 9, row 9
report
CoTi2CoTi2-33.763 kJ/mol-atom298.15model-27.489 (mp-aaacpuil)-32.436 (oqmd-1374887)[4] Davydov 2001Table V, p. 10, row 5
report
L12-26.1875 kJ/mol (basis unstated) ± 1.4298.15experimental[1] Wu 2020
cites Balarin 1996 doi		Table 7, p. 9, row 2
report
L12-24.8211 kJ/mol (basis unstated)298.15model[1] Wu 2020Table 7, p. 9, row 1
report
L12-20.823 kJ/mol-atom298.15model[4] Davydov 2001Table V, p. 10, row 1
report

Other properties

Phase transition (62)

Phase transition, Co–Ti system
PropertyValueT (K)Phases / compositionClassSourceLocationQuote
Phase transition400 K400other: C36 -> L12 + C15model[5] Cacciamani 2000p. 7
report		In the computed phase diagram C36 decomposes at about 400 K into L12+C15.
Phase transition962 K962eutectoid: β-Ti ↔ CoTi2 + α-Tiexperimental[2] Yang 2022Table 3, p. 5, row 7
report
Phase transition964 K964(bTi) CoTi2 ? (aTi)experimental[3] Turchanin 2024p. 3
report		The temperatures of three invariant reactions of L ? CoTi CoTi2, L CoTi2 ? (bTi), and (bTi) CoTi2 ? (aTi) were determined to be 1323, 1302, and 964 K, respectively.
Phase transition964 K964eutectoid: β-Ti ↔ CoTi2 + α-Tiexperimental[2] Yang 2022Table 3, p. 5, row 4
report
Phase transition966 K966eutectoid: β-Ti ↔ CoTi2 + α-Tiexperimental[2] Yang 2022Table 3, p. 5, row 9
report
Phase transition967 K967(bTi) CoTi2 ? (aTi)model[3] Turchanin 2024
cites Wu 2020 doi		p. 2
report		Also, the temperature of the invariant reaction (bTi) CoTi2 ? (aTi) at 967 K was established.
Phase transition967 K967b-Ti ? CoTi2 ? a-Tiexperimental[2] Yang 2022p. 2
report		The temperatures of two invariant reactions liquid ? aCo ? Co3Ti and b-Ti ? CoTi2 ? a-Ti were 1429 and 967 K with an accuracy of ± 3 K.
Phase transition1119 K1119(αCo)ferro ⇄ (αCo)para
(αCo)ferro: Ti 0.083; (αCo)para: Ti 0.083		model[3] Turchanin 2024
cites Yang 2022 doi		Table 3, p. 9, row 12
report
Phase transition1121 K1121(αCo)ferro ⇄ (αCo)para
(αCo)ferro: Ti 0.073; (αCo)para: Ti 0.073		experimental[3] Turchanin 2024
cites Stein 2019 doi		Table 3, p. 9, row 8
report
Phase transition1121 K1121magneticmodel[3] Turchanin 2024
cites Stein 2019 doi		p. 2
report		The TC decreases from 1388 K for a pure Co sample to a constant temperature of 1121 ± 1 K within the two-phase region (aCo) ? TiCo3 at 7.3-16.9 at.% Ti.
Phase transition1129 K1129(αCo)ferro ⇄ (αCo)para
(αCo)ferro: Ti 0.075; (αCo)para: Ti 0.075		model[3] Turchanin 2024Table 3, p. 9, row 13
report
Phase transition1143 K1143(αCo)ferro ⇄ (αCo)para
(αCo)ferro: Ti 0.095; (αCo)para: Ti 0.095		experimental[3] Turchanin 2024
cites Murray 1982 doi		Table 3, p. 9, row 7
report
Phase transition1173 K1173(αCo)ferro ⇄ (αCo)para
(αCo)ferro: Ti 0.096; (αCo)para: Ti 0.096		model[3] Turchanin 2024
cites Cacciamani 2000 doi		Table 3, p. 9, row 9
report
Phase transition1178 K1178(αCo)ferro ⇄ (αCo)para
(αCo)ferro: Ti 0.081; (αCo)para: Ti 0.081		model[3] Turchanin 2024
cites Davydov 2001 doi		Table 3, p. 9, row 10
report
Phase transition1190 K1190(αCo)ferro ⇄ (αCo)para
(αCo)ferro: Ti 0.077; (αCo)para: Ti 0.077		model[3] Turchanin 2024
cites Wu 2020 doi		Table 3, p. 9, row 11
report
Phase transition1300 K1300eutectic: liquid ↔ CoTi2 + β-Tiexperimental[2] Yang 2022Table 3, p. 5, row 6
report
Phase transition1301 K1301eutectic: liquid ↔ CoTi2 + β-Tiexperimental[2] Yang 2022Table 3, p. 5, row 3
report
Phase transition1302 K1302L CoTi2 ? (bTi)experimental[3] Turchanin 2024p. 3
report		The temperatures of three invariant reactions of L ? CoTi CoTi2, L CoTi2 ? (bTi), and (bTi) CoTi2 ? (aTi) were determined to be 1323, 1302, and 964 K, respectively.
Phase transition1304 K1304eutectic: liquid ↔ CoTi2 + β-Tiexperimental[2] Yang 2022Table 3, p. 5, row 8
report
Phase transition1321 K1321other: A3experimental[2] Yang 2022Table 3, p. 5, row 5
report
Phase transition1322 K1322peritectic: liquid + CoTi ↔ CoTi2experimental[2] Yang 2022Table 3, p. 5, row 2
report
Phase transition1323 K1323L ? CoTi CoTi2experimental[3] Turchanin 2024p. 3
report		The temperatures of three invariant reactions of L ? CoTi CoTi2, L CoTi2 ? (bTi), and (bTi) CoTi2 ? (aTi) were determined to be 1323, 1302, and 964 K, respectively.
Phase transition1323 K1323peritectic: liquid + CoTi ↔ CoTi2experimental[2] Yang 2022Table 3, p. 5, row 1
report
Phase transition1388 K1388magneticmodel[3] Turchanin 2024
cites Stein 2019 doi		p. 2
report		The TC decreases from 1388 K for a pure Co sample to a constant temperature of 1121 ± 1 K within the two-phase region (aCo) ? TiCo3 at 7.3-16.9 at.% Ti.
Phase transition1427 K1427L Co3Ti ? C36model[3] Turchanin 2024
cites Wu 2020 doi		p. 2
report		Two invariant reactions with participation of the Co3Ti phase were reported: L ? (aCo) Co3Ti at 1429 K and L Co3Ti ? C36 at 1427 K.
Phase transition1429 K1429L ? (aCo) Co3Timodel[3] Turchanin 2024
cites Wu 2020 doi		p. 2
report		Two invariant reactions with participation of the Co3Ti phase were reported: L ? (aCo) Co3Ti at 1429 K and L Co3Ti ? C36 at 1427 K.
Phase transition1429 K1429liquid ? aCo ? Co3Tiexperimental[2] Yang 2022p. 2
report		The temperatures of two invariant reactions liquid ? aCo ? Co3Ti and b-Ti ? CoTi2 ? a-Ti were 1429 and 967 K with an accuracy of ± 3 K.
Phase transition1454 K1454Liquid = L12
L: Ti 0.203; L12: Ti 0.203		model[4] Davydov 2001Table VI, p. 11, row 18
report
Phase transition1524 K1524liquid ? CoTi ? b-Co2Tiexperimental[2] Yang 2022p. 2
report		The temperatures of four invariant reactions of liquid ? a-Co ? Co3Ti, liquid ? c-Co2Ti ? Co3Ti, liquid ? b-Co2Ti ? c-Co2Ti and liquid ? CoTi ? b-Co2Ti were confirmed to be 1428 ± 2, 1431 ± 2, 1496 ± 3 and 1524 ± 2 K.
Phase transition1598 K1598Liquid = B2
L: Ti 0.5; B2: Ti 0.5		model[4] Davydov 2001
cites Murray 1987 doi		Table VI, p. 11, row 10
report
Phase transition1731 K1731other: I DTA Cooling Tpeak
alloy: Co 0.519, Ti 0.481		experimental[4] Davydov 2001Table II, p. 3, row 4
report
Phase transition1732 K1732other: I Summary TS
alloy: Co 0.519, Ti 0.481		experimental[4] Davydov 2001Table II, p. 3, row 7
report
Phase transition1733 K1733other: I DTA Heating Tonset
alloy: Co 0.519, Ti 0.481		experimental[4] Davydov 2001Table II, p. 3, row 1
report
Phase transition1733 K1733other: I VOM Tfirst melt
alloy: Co 0.519, Ti 0.481		experimental[4] Davydov 2001Table II, p. 3, row 8
report
Phase transition1733 K1733other: II VOM Tfirst melt
alloy: Co 0.506, Ti 0.494		experimental[4] Davydov 2001Table II, p. 3, row 17
report
Phase transition1733 K1733other: III VOM Tfirst melt
alloy: Co 0.496, Ti 0.504		experimental[4] Davydov 2001Table II, p. 3, row 26
report
Phase transition1739 K1739other: II DTA Cooling Tpeak
alloy: Co 0.506, Ti 0.494		experimental[4] Davydov 2001Table II, p. 3, row 13
report
Phase transition1739 K1739other: II DTA Heating Tonset
alloy: Co 0.506, Ti 0.494		experimental[4] Davydov 2001Table II, p. 3, row 10
report
Phase transition1739 K1739other: II Summary TS
alloy: Co 0.506, Ti 0.494		experimental[4] Davydov 2001Table II, p. 3, row 16
report
Phase transition1739 K1739other: III DTA Cooling Tpeak
alloy: Co 0.496, Ti 0.504		experimental[4] Davydov 2001Table II, p. 3, row 22
report
Phase transition1740 K1740other: III Summary TS
alloy: Co 0.496, Ti 0.504		experimental[4] Davydov 2001Table II, p. 3, row 25
report
Phase transition1741 K1741other: III DTA Heating Tonset
alloy: Co 0.496, Ti 0.504		experimental[4] Davydov 2001Table II, p. 3, row 19
report
Phase transition1753 K1753other: I VOM Tcollapse
alloy: Co 0.519, Ti 0.481		experimental[4] Davydov 2001Table II, p. 3, row 9
report
Phase transition1753 K1753other: II VOM Tcollapse
alloy: Co 0.506, Ti 0.494		experimental[4] Davydov 2001Table II, p. 3, row 18
report
Phase transition1753 K1753other: III VOM Tcollapse
alloy: Co 0.496, Ti 0.504		experimental[4] Davydov 2001Table II, p. 3, row 27
report
Phase transition1758 K1758other: I DTA Cooling Tonset
alloy: Co 0.519, Ti 0.481		experimental[4] Davydov 2001Table II, p. 3, row 3
report
Phase transition1761 K1761other: II DTA Cooling Tonset
alloy: Co 0.506, Ti 0.494		experimental[4] Davydov 2001Table II, p. 3, row 12
report
Phase transition1763 K1763other: III DTA Cooling Tonset
alloy: Co 0.496, Ti 0.504		experimental[4] Davydov 2001Table II, p. 3, row 21
report
Phase transition1768 K1768L ⇄ CoTi
L: Ti 0.497; CoTi: Ti 0.497		model[3] Turchanin 2024
cites Wu 2020 doi		Table 3, p. 9, row 48
report
Phase transition1773 K1773L ⇄ CoTi
L: Ti 0.498; CoTi: Ti 0.498		model[3] Turchanin 2024
cites Davydov 2001 doi		Table 3, p. 9, row 47
report
Phase transition1773 K1773Liquid = B2
L: Ti 0.498; B2: Ti 0.498		model[4] Davydov 2001Table VI, p. 11, row 8
report
Phase transition1773 K1773othermodel[3] Turchanin 2024p. 8
report		According to the results of our calculations, the melting temperature of the CoTi phase is 1773 K, which is very consistent with the data[6,18] given the significant scatter of experimental points for the liquidus of this phase.
Phase transition1774 K1774Liquid = B2
L: Ti 0.502; B2: Ti 0.502		model[4] Davydov 2001Table VI, p. 11, row 9
report
Phase transition1774 K1774other: I DTA Heating Tpeak
alloy: Co 0.519, Ti 0.481		experimental[4] Davydov 2001Table II, p. 3, row 2
report
Phase transition1775 K1775other: II DTA Heating Tpeak
alloy: Co 0.506, Ti 0.494		experimental[4] Davydov 2001Table II, p. 3, row 11
report
Phase transition1776 K1776L ⇄ CoTi
L: Ti 0.504; CoTi: Ti 0.504		experimental[3] Turchanin 2024
cites Davydov 2001 doi		Table 3, p. 9, row 45
report
Phase transition1776 K1776congruent meltingexperimental[2] Yang 2022
cites Davydov 2001 doi		p. 2
report		After that, Davydov et al. [23] measured the congruent melting temperature of CoTi as 1776 K with an accuracy of ± 5 K by combination of visual observation of melting (VOM) and differential thermal analysis (DTA).
Phase transition1776 K1776other: III DTA Heating Tpeak
alloy: Co 0.496, Ti 0.504		experimental[4] Davydov 2001Table II, p. 3, row 20
report
Phase transition1778 K1778L ⇄ CoTi
L: Ti 0.5; CoTi: Ti 0.5		experimental[3] Turchanin 2024
cites Stein 2019 doi		Table 3, p. 9, row 46
report
Phase transition1778 K1778congruent meltingexperimental[2] Yang 2022p. 2
report		The congruent melting temperature of CoTi was determined as 1778 ± 5 K, which was consistent with the previous value [23].
Phase transition1778 K1778congruent transformationexperimental[3] Turchanin 2024p. 2
report		The congruent melting temperature of the CoTi was determined as 1778 ± 5 K, which is in very good agreement with the value presented by Davydov et al.[18]
Phase transition1793 K1793L ⇄ CoTi
L: Ti 0.493; CoTi: Ti 0.493		experimental[3] Turchanin 2024
cites Petkov 1971		Table 3, p. 9, row 44
report

Phase equilibrium (29)

Phase equilibrium, Co–Ti system
PropertyValueT (K)Phases / compositionClassSourceLocationQuote
Phase assemblageB2 + C15
alloy: Co 0.65, Ti 0.35		experimental[1] Wu 2020Table 9, p. 11, row 6
report
Phase assemblageB2 + C15
alloy: Co 0.65, Ti 0.35		unspecified[1] Wu 2020Table 9, p. 11, row 5
report
Phase assemblageC36 + L1₂
alloy: Co 0.76, Ti 0.24		experimental[1] Wu 2020Table 9, p. 11, row 2
report
Phase assemblageC36 + L1₂
alloy: Co 0.76, Ti 0.24		unspecified[1] Wu 2020Table 9, p. 11, row 1
report
Phase assemblageE9₃ + A2(βTi)
alloy: Co 0.24, Ti 0.76		experimental[1] Wu 2020Table 9, p. 11, row 10
report
Phase assemblageE9₃ + A2(βTi)
alloy: Co 0.24, Ti 0.76		unspecified[1] Wu 2020Table 9, p. 11, row 9
report
Phase composition1173.15A1(αCo) + L1₂ + L12
A1(αCo): Co 0.896, Ti 0.104; L1₂: Co 0.787, Ti 0.213; L12: Co 0.787, Ti 0.213		experimental[1] Wu 2020Table 3, p. 5, row 2
report
Phase composition1173.15A1(αCo) + L1₂ + L12
A1(αCo): Co 0.902, Ti 0.098; L1₂: Co 0.794, Ti 0.206; L12: Co 0.794, Ti 0.206		experimental[1] Wu 2020Table 3, p. 5, row 1
report
Phase composition1173.15B2 + E9₃ + E93
B2: Co 0.483, Ti 0.517; E9₃: Co 0.324, Ti 0.676; E93: Co 0.324, Ti 0.676		experimental[1] Wu 2020Table 3, p. 5, row 7
report
Phase composition1173.15L1₂ + C36 + L12
L1₂: Co 0.744, Ti 0.256; L12: Co 0.744, Ti 0.256; C36: Co 0.693, Ti 0.307		experimental[1] Wu 2020Table 3, p. 5, row 4
report
Phase composition1223CoTi + CoTi2
CoTi: Co 0.496, Ti 0.504; CoTi2: Co 0.3261, Ti 0.6739		experimental[2] Yang 2022Table 2, p. 4, row 5
report
Phase composition1223CoTi + CoTi2
CoTi: Co 0.4985, Ti 0.5015; CoTi2: Co 0.3306, Ti 0.6694		experimental[2] Yang 2022Table 2, p. 4, row 1
report
Phase composition1223CoTi2 + β-Ti
CoTi2: Co 0.328, Ti 0.672; β-Ti: Co 0.0996, Ti 0.9004		experimental[2] Yang 2022Table 2, p. 4, row 2
report
Phase composition1223CoTi2 + β-Ti
CoTi2: Co 0.3291, Ti 0.6709; β-Ti: Co 0.1186, Ti 0.8814		experimental[2] Yang 2022Table 2, p. 4, row 8
report
Phase composition1223CoTi2 + β-Ti
CoTi2: Co 0.3238, Ti 0.6762; β-Ti: Co 0.0977, Ti 0.9023		experimental[2] Yang 2022Table 2, p. 4, row 3
report
Phase composition1223CoTi2 + β-Ti
CoTi2: Co 0.3232, Ti 0.6768; β-Ti: Co 0.1173, Ti 0.8827		experimental[2] Yang 2022Table 2, p. 4, row 6
report
Phase composition1223CoTi2 + β-Ti
CoTi2: Co 0.3222, Ti 0.6778; β-Ti: Co 0.0994, Ti 0.9006		experimental[2] Yang 2022Table 2, p. 4, row 4
report
Phase composition1223CoTi2 + β-Ti
CoTi2: Co 0.3246, Ti 0.6754; β-Ti: Co 0.1213, Ti 0.8787		experimental[2] Yang 2022Table 2, p. 4, row 7
report
Phase composition1273.15C15 + B2
C15: Co 0.651, Ti 0.349; B2: Co 0.534, Ti 0.466		experimental[1] Wu 2020Table 3, p. 5, row 6
report
Phase composition1273.15C36 + C15
C36: Co 0.688, Ti 0.312; C15: Co 0.668, Ti 0.332		experimental[1] Wu 2020Table 3, p. 5, row 5
report
Phase composition1273.15E9₃ + A2(βTi) + E93
E9₃: Co 0.353, Ti 0.647; E93: Co 0.353, Ti 0.647; A2(βTi): Co 0.077, Ti 0.923		experimental[1] Wu 2020Table 3, p. 5, row 8
report
Phase composition1273.15E9₃ + A2(βTi) + E93
E9₃: Co 0.321, Ti 0.679; E93: Co 0.321, Ti 0.679; A2(βTi): Co 0.104, Ti 0.896		experimental[1] Wu 2020Table 3, p. 5, row 9
report
Phase composition1273.15L1₂ + C36 + L12
L1₂: Co 0.744, Ti 0.256; L12: Co 0.744, Ti 0.256; C36: Co 0.694, Ti 0.306		experimental[1] Wu 2020Table 3, p. 5, row 3
report
Phase composition1766other: I Summary TL
liquid: Co 0.519, Ti 0.481		experimental[4] Davydov 2001Table II, p. 3, row 5
report
Phase composition1768other: II Summary TL
liquid: Co 0.506, Ti 0.494		experimental[4] Davydov 2001Table II, p. 3, row 14
report
Phase composition1769.5other: III Summary TL
liquid: Co 0.496, Ti 0.504		experimental[4] Davydov 2001Table II, p. 3, row 23
report
Phase composition1774other: I Summary TL (used for optimization)
liquid: Co 0.519, Ti 0.481		experimental[4] Davydov 2001Table II, p. 3, row 6
report
Phase composition1775other: II Summary TL (used for optimization)
liquid: Co 0.506, Ti 0.494		experimental[4] Davydov 2001Table II, p. 3, row 15
report
Phase composition1776other: III Summary TL (used for optimization)
liquid: Co 0.496, Ti 0.504		experimental[4] Davydov 2001Table II, p. 3, row 24
report

Formation (5)

Formation, Co–Ti system
PropertyValueT (K)Phases / compositionClassSourceLocationQuote
Entropy of formation
printed: ΔfS298		-2.6 J/mol-atom/K298.15B2
alloy: Co 0.5, Ti 0.5		model[4] Davydov 2001Table V, p. 10, row 4
report
Entropy of formation
printed: ΔfS298		1 J/mol-atom/K298.15C15
alloy: Co 0.67, Ti 0.33		model[4] Davydov 2001Table V, p. 10, row 3
report
Entropy of formation
printed: ΔfS298		1.3 J/mol-atom/K298.15C36
alloy: Co 0.69, Ti 0.31		model[4] Davydov 2001Table V, p. 10, row 2
report
Entropy of formation
printed: ΔfS298		-4.7 J/mol-atom/K298.15CoTi2
alloy: Co 0.33, Ti 0.67		model[4] Davydov 2001Table V, p. 10, row 5
report
Entropy of formation
printed: ΔfS298		2.3 J/mol-atom/K298.15L12
alloy: Co 0.76, Ti 0.24		model[4] Davydov 2001Table V, p. 10, row 1
report

Mixing / partial (2)

Mixing / partial, Co–Ti system
PropertyValueT (K)Phases / compositionClassSourceLocationQuote
Enthalpy of mixing
printed: DmH		-33.3 kJ/mol (basis unstated)1873model[3] Turchanin 2024p. 8
report		The mixing enthalpy of the liquid Co-Ti alloys calculated at 1873 K is shown in Fig. 1(a) and shows satisfactory agreement with calorimetric data.[19-21] The minimum value of the mixing enthalpy is DmH = - 33.3 kJ/mol at xTi = 0.47.
Enthalpy of mixing
printed: integral mixing enthalpy		-50.5 kJ/mol (basis unstated)1873experimental[3] Turchanin 2024
cites Ueda 1986 doi		p. 3
report		As an example, the minimum value of the integral mixing enthalpy of - 50.5 kJ/mol at xTi = 0.52 and 1873 K was reported in Ref [22], which contradicts the results of direct calorimetric measurements.[19-21]

Crystal structure (8)

Crystal structure, Co–Ti system
PropertyValueT (K)Phases / compositionClassSourceLocationQuote
Lattice a6.716 Å298.15Co2Ti (c)
alloy: Ti 0.333333		experimental[5] Cacciamani 2000
cites Pet'kov 1971		Table 1, p. 2, row 4
report
Lattice a4.732 Å298.15Co2Ti (h)
alloy: Ti 0.333333		experimental[5] Cacciamani 2000
cites Pet'kov 1971		Table 1, p. 2, row 5
report
Lattice a3.618 Å298.15Co3Ti
alloy: Ti 0.25		experimental[5] Cacciamani 2000
cites Pet'kov 1971		Table 1, p. 2, row 3
report
Lattice a3.603 Å298.15Co3Ti
alloy: Ti 0.25		experimental[5] Cacciamani 2000
cites Pet'kov 1971		Table 1, p. 2, row 3
report
Lattice a2.988 Å298.15CoTi
alloy: Ti 0.5		experimental[5] Cacciamani 2000
cites Pet'kov 1971		Table 1, p. 2, row 6
report
Lattice a2.996 Å298.15CoTi
alloy: Ti 0.5		experimental[5] Cacciamani 2000
cites Pet'kov 1971		Table 1, p. 2, row 6
report
Lattice a11.3 Å298.15CoTi2
alloy: Ti 0.666667		experimental[5] Cacciamani 2000
cites Pet'kov 1971		Table 1, p. 2, row 7
report
Lattice c15.427 Å298.15Co2Ti (h)
alloy: Ti 0.333333		experimental[5] Cacciamani 2000
cites Pet'kov 1971		Table 1, p. 2, row 5
report

Sources

Reporting papers the values were read from (a value cited from another work names that work in its row).

  1. Liying Wu, Yinping Zeng, Yafei Pan, Yong Du, Yingbiao Peng, Han Li et al., Thermodynamic description and simulation of solidification microstructure in the Co-Ti system, The Journal of Chemical Thermodynamics 142, 105995 (2020). doi:10.1016/j.jct.2019.105995
  2. Hua-kou Yang, Chen-yang Zhou, Hang Wang, Bin Yang, Phase equilibria in Ti-rich portion and thermodynamic re-optimization of Co–Ti system, J. Iron Steel Res. Int. 29, 914-924 (2022). doi:10.1007/s42243-021-00736-6
  3. Mykhailo Turchanin, Pavlo Agraval, Anna Vodopyanova, Liya Dreval, Thermodynamic Assessment of the Co-Ti System, J. Phase Equilib. Diffus. 45, 434-446 (2024). doi:10.1007/s11669-024-01094-y
  4. A. V. Davydov, U. R. Kattner, D. Josell, R. M. Waterstrat, W. J. Boettinger, J. E. Blendell et al., Determination of the CoTi congruent melting point and thermodynamic reassessment of the Co-Ti system, Metall Mater Trans A 32, 2175-2186 (2001). doi:10.1007/s11661-001-0193-8
  5. G. Cacciamani, R. Ferro, I. Ansara, N. Dupin, Thermodynamic modelling of the Co–Ti system, Intermetallics 8, 213-222 (2000). doi:10.1016/s0966-9795(99)00098-9