Ageing process of pre-precipitation phase in Ni0.75Al0.05Fe0.2 alloy based on phase field method

被引：12

作者：

Dong Wei-ping ^{[1
]}

Wang Yong-xin ^{[1
]}

Chen Zheng ^{[1
,2
]}

Yang Kun ^{[1
]}

机构：

[1] Northwestern Polytech Univ, Coll Mat Sci & Engn, Xian 710072, Peoples R China

[2] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China

来源：

TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2011年 / 21卷 / 05期

基金：

中国国家自然科学基金;

关键词：

pre-precipitation phase; equilibrium phase; interatomic potentials; free energy; phase field method; TRANSIENT ORDERED STATES; L1(2) PHASE; KINETICS; TRANSFORMATION; DECOMPOSITION; SI;

D O I：

10.1016/S1003-6326(11)60828-5

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

By utilizing phase field method combined with analysis on free energy and interatomic potentials, pre-precipitation phase formation and transformation process of Ni0.75Al0.05Fe0.2 alloy in early precipitation stage during the ageing process under 1 000 K were studied. And free energy, microstructures, compositions and volume fractions of pre-precipitation phase and equilibrium phase were analyzed. The simulation results indicate that nonstoichiometric L1(0) pre-precipitation phase formed first, and then would gradually transform into L1(2) equilibrium phase. It is discovered that the phase transformation process was closely related to free energy and interatomic potentials. Additionally, it is revealed that free energy of L1(0) pre-precipitation phase was higher and interatomic potential was smaller than that of L1(2) equilibrium phase. Therefore, it is concluded that L1(0) phase was unstable, and phase transformation would occur to L1(2) which was more stable.

引用

页码：1105 / 1111

页数：7

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