Phase-field Simulation of Microstructural Evolution of γ Precipitate in γ′ Matrix in Binary Ni-Al Alloys

被引：6

作者：

Sun, Weihua ^{[1
]}

Cui, Senlin ^{[1
]}

Zhang, Lijun ^{[2
]}

Du, Yong ^{[1
]}

Huang, Baiyun ^{[1
]}

机构：

[1] Cent S Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China

[2] Ruhr Univ Bochum, Interdisciplinary Ctr Adv Mat Simulat ICAMS, D-44801 Bochum, Germany

来源：

IUMRS INTERNATIONAL CONFERENCE IN ASIA 2011 | 2012年 / 36卷

基金：

中国国家自然科学基金;

关键词：

Ni-Al alloys; multi-phase field; calphad database; ELASTIC-CONSTANTS; INTERMETALLICS; PARTICLES; MODEL;

D O I：

10.1016/j.proeng.2012.03.031

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

The microstructural evolution of gamma precipitates (Ni with fcc_A1 structure) in gamma' matrix (Ni3Al with L12 structure) in the binary Ni-Al alloys was studied by means of the multi-phase-field (MPF) approach. The thermodynamic driving force and diffusivities were taken from the CALPHAD databases via the TQ interface. The thermophysical parameters, interfacial energy, elastic constants, and lattice mismatch were all set to be experimental values. The morphology evolution of one, two and multi gamma precipitates in gamma' matrix were analyzed via the present phase-field simulations. A splitting behavior of two close precipitates was also observed. In the case of multi gamma precipitates, the shape of the precipitates is spherical at the stage of nucleation, then cuboidal during growth stage, and becomes plate-like at the stage of coarsening, which shows good agreement with the experimental results. (C) 2011 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of MRS-Taiwan

引用

页码：200 / 206

页数：7

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