On the effect of superimposed external stresses on the nucleation and growth of Ni4Ti3 particles: A parametric phase field study
On the effect of superimposed external stresses on the nucleation and growth of Ni4Ti3 particles: A parametric phase field study
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DOI：
10.1016/j.actamat.2011.02.002
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发表时间：
2011-05-01
期刊：
影响因子：
9.4
通讯作者：
Eggeler, Gunther
中科院分区：
文献类型：
--
作者：
Guo, Wei;Steinbach, Ingo;Eggeler, Gunther
使用多相场方法研究了叠加应力对相互作用Ni4Ti3颗粒的块状的影响。发现A（1 1 1）B-2平面中Ni4Ti3粒子的厚度/直径比随增加[1 1 1]（B2）应力分量的增加而增加。随着施加应力的增加，粒子形状可以从磁盘变为球体。还发现，两个Ni4Ti3颗粒之间的扩散和机械相互作用可以促进新颗粒的成核。这为先前报道的成核的自催化性质提供了解释。沿[1 1 1]（B2）的压缩应力增加了（1 1 1 1）（B2）平面的Ni4Ti3颗粒的体积分数和生长速度。在颗粒生长过程中，不良导向的颗粒消失。根据先前的实验结果，讨论了仿真结果。 （c）2011 Acta Mitalietia Inc.由Elsevier Ltd.发布的所有权利保留。
The effect of a superimposed stress on the coarsening of interacting Ni4Ti3 particles is studied using the multi-phase field method. It is found that the thickness/diameter ratio of a Ni4Ti3 particle in a (1 1 1)B-2 plane increases with an increasing [1 1 1](B2) stress component. The particle shape can change from a disk to a sphere with increasing applied stress. It is also found that diffusional and mechanical interactions between two Ni4Ti3 particles can promote the nucleation of new particles. This provides an explanation for the autocatalytic nature of nucleation reported previously. Compressive stresses along [1 1 1](B2) increase the volume fraction and growth velocity of the Ni4Ti3 particles of the (1 1 1)(B2) plane. Misoriented particles disappear during particle growth. The simulation results are discussed in the light of previous experimental results. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.