湖南人文科技学院能源与机电工程学院,娄底 417000
彭广威,男,1975年出生,教授,E-mail:44716656@qq.com
收稿:2025-05-08,
修回:2025-09-15,
录用:2025-09-30,
纸质出版:2026-10-20
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彭广威,詹婷,魏祥,等. Ni3(A0.5B0.5)合金化合物稳定性及力学性能第一性原理[J]. 特种铸造及有色合金,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.
彭广威,詹婷,魏祥,等. Ni3(A0.5B0.5)合金化合物稳定性及力学性能第一性原理[J]. 特种铸造及有色合金,2026,46(10):1 511-1 518. DOI: 10.15980/j.tzzz.T20250194. DOI:
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:
通过第一性原理方法系统探究了L1
2
和D0
22
结构的Ni
3
(
A
0.5
B
0.5
)(
A
、
B
=Al、Ti、V、Si、Sn的2种元素)三元金属间化合物热稳定性及力学性能,并通过与二元合金Ni
3
X
体系的对比揭示了合金化效应。结果表明,除Ni
3
(V
0.5
Ti
0.5
)外,三元体系的L1
2
相较D0
22
相具有更低的形成焓与结合能,表明L1
2
结构更易形成且热稳定性更高;L1
2
-Ni
3
(V
0.5
Sn
0.5
)、Ni
3
(Al
0.5
V
0.5
)和Ni
3
(Al
0.5
Ti
0.5
)呈现负的混合焓,其中L1
2
-Ni
3
(Al
0.5
V
0.5
)的混合焓最低(-3.39 kJ/mol),说明该三元合金相可优先于二元相析出。力学性能计算揭示,所有合金相的力学稳定性都满足Born准则,其中L1
2
-Ni
3
(Al
0.5
V
0.5
)的硬度(11.14 GPa)和韧度(
K
IC
=21.89 MPa·m
1/2
)都高于L1
2
-Ni
3
Al和Ni
3
V。
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 (
K
IC
=21.89 MPa · m
1/2
) of L1
2
-Ni
3
(Al
0.5
V
0.5
) are higher than those of L1
2
-Ni
3
Al and Ni
3
V.
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