Atomistic simulation of martensitic phase transformation at the crack tip in B2NiAl

被引：21

作者：

Guo, Ya-Fang ^{[1
]}

Wang, Yue-Sheng

Wu, Wen-Ping

Zhao, Dong-Liang

机构：

[1] Jiao Tong Univ, Inst Engn Mech, Beijing 100044, Peoples R China

[2] Cent Iron & Steel Res Inst, Funct Mat Div, Beijing 100081, Peoples R China

来源：

ACTA MATERIALIA | 2007年 / 55卷 / 11期

关键词：

molecular dynamics simulations; fracture; martensitic transformation; NiAl;

D O I：

10.1016/j.actamat.2007.03.002

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Mechanisms of low-temperature deformation at the crack tip in B2 NiAl are studied by molecular dynamics simulations. The stressinduced martensitic transformation is found to occur at the crack tip when a sufficiently high stress concentration exists. For cracks with < 100 > crack fronts, the layered structures of martensites are formed at the crack tip, which is caused by the atoms' relative displacement on a basal plane due to the shear stress at the crack tip. The mechanism of the martensitic transformation from the B2 to the L1(0) structures occurs along the Bain path. For cracks with < 110 > crack fronts, the martensitic transformation occurs Without any layered struclures existing. The phase transformation is caused by the atoms' relative displacements at different atoms layers in the entire martensite formed region. (c) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：3891 / 3897

页数：7

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