Deformation mechanism of martensite in Ti-rich Ti-Ni shape memory alloy thin films

被引：104
|
作者：
Zhang, JX [1 ]
Sato, M [1 ]
Ishida, A [1 ]
机构：
[1] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan
来源：
ACTA MATERIALIA | 2006年 / 54卷 / 04期
关键词：
shape memory alloys; transmission electron microscopy; thin films; plastic deformation; sputtering deposition;
D O I：
10.1016/j.actamat.2005.10.046
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The microstructural evolution of deformed B19' martensite in Ti-rich Ti-48.9 at.% Ni shape memory thin films was studied by transmission electron microscopy and the deformation mechanism of the martensite was clarified. The thin film was fabricated by sputter deposition. In this thin film the thermally formed martensite has (001) twinning as its substructure due to the effect of Guinier-Preston zones. The tensile deformation involves the reorientation of (001) twinning domains, formation of (100), (20 (1) over bar), and ((11) over bar3) deformation twins, and detwinning of the existing (001) twins. The (100) twins and the (20 (1) over bar) twins grow one by one and form a zigzagged configuration. The ((11) over bar3) twin is a newly found deformation twin in the Ti-Ni alloy. The irrecoverable strain is caused by the irreversibility of the deformation-induced (20 (1) over bar) and ((11) over bar3) twins during heating. (c) 2005 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：1185 / 1198
页数：14
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