Phase-field simulation with the CALPHAD method for the microstructure evolution of multi-component Ni-base superalloys

被引：19
|
作者：
Kitashima, Tomonori [1 ]
Wang, Jincheng [2 ]
Harada, Hiroshi [1 ]
机构：
[1] Natl Inst Mat Sci, High Temperat Mat Ctr, Tsukuba, Ibaraki 3050047, Japan
[2] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China
来源：
INTERMETALLICS | 2008年 / 16卷 / 02期
关键词：
phase transformation; phase stability; prediction;
D O I：
10.1016/j.intermet.2007.10.001
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In order to simulate multi-component diffusion in a Ni-base superalloy using the phase-field method, the Gibbs free energy of the gamma and gamma' phases in the quaternary Ni-Al-Re-Ta superalloy system was linked to the CALPHAD method using a four-sublattice model. The free energy curve and phase equilibrium compositions in this work were in good agreement with the results of the Thermo-calc calculation, indicating that the model was successfully linked to the CALPHAD method. A one-dimensional phase-field simulation showed a pileup of Re at the gamma/gamma' interface during the growth of precipitates as well as a spike of the Re concentration in a gamma' phase, accompanied by precipitate coalescence. (C) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码：239 / 245
页数：7
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