Table 3 Optimized CALPHAD parameters and their (Bayesian) standard deviations of the binaries, ternaries, and quaternary.

From: On the stochastic phase stability of Ti2AlC-Cr2AlC

Ti-Al

Cr-Al

Liquid

−44826.774 (±5940.548) − 9.705 (±3.425) × T

Liquid

−16280.734 (±2547.996) − 1.255 (±0.00581) × T

 

19984.519 (±6532.623) − 3.768 (±4.379) × T

Bcc

−31542.024 (±4864.770) + 3.55 (±2.942) × T

Fcc

GHSERAL

 

21170.075 (±11420.795) − 10.532 (±7.273) × T

Al3Ti

−161609.797 (±2728.262) + 34.147 (±1.876) × T

Fcc

36281.545 (±2922.821) − 39.185 (±2.156) × T

Al2Ti

−130310.371 (±2455.017) + 27.823 (±1.767) × T

AlCr2

−22220.569 (±3867.136) − 10.415 (±2.592) × T

AlTi

−777301.828 (±10896.578) + 100.0 (±7.655) × T

Al4Cr

−33435.227 (±3432.087) − 11.231 (±2.627) × T

AlTi3

−256328.239 (±9668.292) + 14.891 (±6.253) × T

Al8 \({{\rm{Cr}}}_{5}^{L}\)

−34476.155 (±24897.260) − 99.999 (±14.365) × T

Hcp

−85725.167 (±1232.210) + 0.149 (±0.236) × T

Al8 \({{\rm{Cr}}}_{5}^{H}\)

−80955.010 (±15349.512) − 67.728 (±11.668) × T

 

−3664.848 (±4092.983) + 4.421 (±2.452) × T

Al9 \({{\rm{Cr}}}_{4}^{L}\)

−21193.384 (±20765.556) − 99.984 (±14.385) × T

−18016.218 (±7117.0) + 27.146 (±4.157) × T

Al9 \({{\rm{Cr}}}_{4}^{H}\)

−83347.404 (±13272.196) − 52.337 (±9.686) × T

Bcc

−77446.353 (±2772.679) − 1.560 (±1.607) × T

Al11Cr2

−89989.489 (±6663.153) − 12.427 (±5.063) × T

 

−5001.401 (±4993.332) + 4.004 (±3.061) × T

Al13Cr2

−108076.0 (±5847.849) + 2.893 (±3.921) × T

23443.277 (±8667.487) − 5.158 (±4.838) × T

  

Al11Ti5

−617287.480 (±17072.163) + 100.0 (±11.203) × T

Ti-C

Ti-Cr

Liquid

−29519.275 (±13942.121) − 70.379 (±5.40) × T

Liquid

25474.148 (±7201.615) − 19.291 (±4.464) × T

Bcc

GBCCTI

 

9474.205 (±7013.502) − 4.579 (±4.299) × T

Hcp

GHSERTI

Bcc

−3127.928 (±1738.686) + 5.743 (±1.636) × T

TiC

−1410506.470 (±55337.817) − 37.795 (±21.571) × T

 

5016.857 (±1187.926) − 3.643 (±1.107) × T

Graphite

GHSERCC

1294.061 (±1386.114) − 3.673 (±1.004) × T

  

TiCr2

−37098.412 (±900.327) + 8.455 (±0.790) × T

Hcp

23631.773 (±1522.291) − 4.893 (±2.040) × T

Cr-C

Al-C

Liquid

−127800.114 (±682.547) + 0.0 (±0.0571) × T

Liquid

109830.637 (±5334.934) − 59.436 (±2.461) × T

Bcc

GHSERCR

Fcc

GHSERAL

Cr23C6

−229313.680 (±9578.358) − 54.894 (±5.772) × T

Al4C3

−22342.766 (±13822.148) − 24.358 (±6.117) × T

Cr7C3

−60777.111 (±4392.626) − 48.386 (±2.355) × T

Graphite

GHSERCC

Cr3C2

−24866.751 (±2832.234) − 24.788 (±1.457) × T

  

Cr-Al-C

Ti-Al-C

Cr2AlC

−73776.041 (±50610.801) + 13.877 (±23.171) × T

Ti2AlC

−274945.380 (±337844.323) + 23.478 (±40.730) × T

  

Ti3AlC

−286333.291 (±353070.956) + 14.647 (±25.321) × T

Ti4AlC3

−286333.291 + 14.647 × T

Ti-Cr-Al-C

(Ti1/3Cr2/3)3AlC2

−286333.291 + 14.647 × T

(Ti1/2Cr1/2)2AlC

−286333.291 + 14.647 × T

  1. Note that (1) the energies resulted from these parameters are in the typical unit of J/mol/atom and (2) the standard deviations of Cr-Al-C and Ti-Al-C are relatively large due to the fact that there are much fewer thermodynamic constraints available for these systems than the binaries.