PENG G W,ZHAN T,WEI X,et al. First principles study on stability and mechanical properties of Ni3 (A0.5B0.5) compounds[J]. Special Casting & Nonferrous Alloys,2026,46(10):1 511-1 518. DOI: 10.15980/j.tzzz.T20250194.
PENG G W,ZHAN T,WEI X,et al. First principles study on stability and mechanical properties of Ni3 (A0.5B0.5) compounds[J]. Special Casting & Nonferrous Alloys,2026,46(10):1 511-1 518. DOI: 10.15980/j.tzzz.T20250194.DOI:
First Principles Study on Stability and Mechanical Properties of Ni3 (A0.5B0.5) Compounds
The thermodynamic stability and mechanical properties of Ni
3
(
A
0.5
B
0.5
)(
A
、
B
as two elements in Al、Ti、V、Si、Sn) ternary intermetallic compounds with L1
2
and D0
22
structures were systematically investigated by first princip
les study, and the alloying effect was revealed by comparison with binary alloy Ni
3
X
system. The results indicate that L1
2
phase of ternary system exhibits a more negative enthalpy of formation and binding energy compared to D0
22
phase except for Ni
3
(Al
0.5
Ti
0.5
), demonstrating that the tendency to form L1
2
structure with higher thermal stability. L1
2
-Ni
3
(V
0.5
Sn
0.5
), Ni
3
(Al
0.5
V
0.5
) and Ni₃(Al
0.5
Ti
0.5
) exhibit a negative mixing enthalpy, where the mixing enthalpy of L1
2
-Ni
3
(Al
0.5
V
0.5
) is the most negative (-3.39 kJ/mol), proving preferential precipitation of ternary alloy phase over binary phase. Mechanical performance calculations reveal that the mechanical stability of all alloy phases meet the Born criterion, where the hardness (11.14 GPa) and toughness (
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