Essential Magnesium Alloys Binary Phase Diagrams and Their Thermochemical Data

Table 18

Optimized model parameters of the Mg-Y system (this work).

Phase	Parameters; Δ𝑔^0 and ^0𝐿 in J/mole, ^oΔ𝐻 in J/mole·atom and ^oΔ𝑆 in J/mole·atom·K
Liquid	Z^MgMgY=2,Z^YYMg=4; Δ𝑔^0MgY=−13980.6+6.45𝑇; Δ𝑔^10MgY= −15 445.6 + 8.87𝑇; Δ𝑔^01MgY= 5 274.1 + 2.09𝑇;
Mg-hcp	^0𝐿^Mg-hcp=−12476.8+7.49𝑇; ^1𝐿^Mg-hcp=−2724.6+2.4𝑇; ^2𝐿^Mg-hcp= −2 788.2 + 2.0𝑇;
Y-bcc (𝛽)	^0𝐿^Y-bcc= −28 713.7 + 13.07𝑇; ^1𝐿^Y-bcc= −2 005.9 + 1.5𝑇;
Mg48Y10 (𝜀); (Mg%, Y)29; ( Y%, Mg)10 (Mg)19	^0𝐺^𝜀Mg:Y:Mg= −6 179.0; ^0𝐺^𝜀Mg:Mg:Mg= 935.5 + 0.14𝑇; ^0𝐺^𝜀Y:Y:Mg= 8 038.3; ^0𝐺^𝜀Y:Mg:Mg= 721.7 (J/mole·atom)
Mg2Y(𝛿); (Mg%, Y)6; (Y%, Mg)4; (Mg)2	^0𝐺^𝛿Mg:Y:Mg= −9 767.5 + 0.66𝑇; ^0𝐺^𝛿Mg:Mg:Mg= 3 544.1 + 1.39𝑇; ^0𝐺^𝛿Y:Y:Mg = ^0𝐺^𝛿Y:Mg:Mg= 6 976.3; ^0𝐿^𝛿Mg,Y:Y:Mg= 641.8 + 11.86𝑇; ^0𝐿^𝛿Mg,Y:Mg:Mg = ^0𝐿^𝛿Y:Y,Mg:Mg= 9 006.5 + 88.60𝑇; ^0𝐿^𝛿Mg:Y,Mg:Mg= −2 096.2 + 0.05𝑇 (J/mole·atom)
MgY (𝛾); (Mg%, Y); (Y%, Va)	^0𝐺^𝛾Mg:Y= −10 727.3 + 1.26𝑇; ^0𝐺^𝛾Mg:Va= −10 464.5; ^0𝐺^𝛾Y:Y=^0𝐺^𝛾Y:Va= 13 483.6; ^0𝐿^𝛾Mg,Y:Y= 15 006.5 + 16𝑇; ^0𝐿^𝛾Mg,Y:Va= 15 006.5 + 15𝑇; ^0𝐿^𝛾Mg,Y:Va = ^0𝐿Y:Y,Va= −5 000.0 + 7𝑇 (J/mole·atom)