Austenite-martensite interface in shape memory alloys

被引：47

作者：

Lei, C. H. ^{[1
]}

Li, L. J. ^{[1
]}

Shu, Y. C. ^{[2
]}

Li, J. Y. ^{[1
]}

机构：

[1] Univ Washington, Dept Mech Engn, Seattle, WA 98195 USA

[2] Natl Taiwan Univ, Inst Appl Mech, Taipei 106, Taiwan

来源：

APPLIED PHYSICS LETTERS | 2010年 / 96卷 / 14期

关键词：

crystal symmetry; eigenvalues and eigenfunctions; internal stresses; martensitic structure; reverse martensitic transformations; shape memory effects; solid-state phase transformations; PHASE-FIELD MODEL; MICROSTRUCTURE; HYSTERESIS;

D O I：

10.1063/1.3385278

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A two-scale phase field simulation is developed for austenite-martensite interface to understand the effects of crystalline symmetry and geometric compatibilities on the reversibility of structural phase transformations in shape memory alloys. It is observed that when the middle eigenvalue of martensite transformation strain is equal to zero, an exact austenite-martensite interface is formed with negligible elastic energy. On the other hand, when the middle eigenvalue is different from 0, an inexact interface between austenite and martensitic twin is formed, and the corresponding elastic energy increases with the increased magnitude of the middle eigenvalue, resulting in substantially higher energy barrier for austenite-martensite transformation, and thus higher thermal hysteresis in shape memory alloys.

引用

页数：3

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