Fracture mechanism of a Ni-Mn-Ga ferromagnetic shape memory alloy single crystal

被引：20
|
作者：
Xiong, F
Liu, Y [1 ]
Pagounis, E
机构：
[1] Nanyang Technol Univ, Sch Mech & Prod Engn, Singapore 639798, Singapore
[2] AdaptaMat Ltd, Helsinki 00390, Finland
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2005年 / 285卷 / 03期
关键词：
martensitic transformation; magnetic shape memory (MSM) effect; lattice twin; magnetization; fracture;
D O I：
10.1016/j.jmmm.2004.08.011
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Ni-Mn-Ga ferromagnetic shape memory alloys (FSMAs) have shown large magnetic-field-induced strains up to 10%. The fracture behavior of these materials under thermal and magnetic cycling has not been reported so far. An Ni-Mn-Ga single crystal exhibiting both thermal and magnetic shape memory effect was investigated in the present study. Coexistence of differently oriented martensite twinned variants and its effect on the magnetization and fracture mechanism were studied. Fracture behavior of this alloy was found to be strongly related to the martensitic transformation while the fracture surface was parallel to one of the {112} martensite twin planes. Different orientations of martensite variants were responsible for the formation of the crack network leading to fracture. (C) 2004 Elsevier B.V. All rights reserved.
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页码：410 / 416
页数：7
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