Direct evidence for stress-induced transformation between coexisting multiple martensites in a Ni-Mn-Ga multifunctional alloy

被引：13
作者：
Huang, L. [1 ,2 ]
Cong, D. Y. [1 ]
Wang, Z. L. [2 ]
Nie, Z. H. [2 ]
Dong, Y. H. [1 ]
Zhang, Y. [1 ]
Ren, Y. [3 ]
Wang, Y. D. [1 ]
机构：
[1] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China
[2] Beijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China
[3] Argonne Natl Lab, Xray Sci Div, Argonne, IL 60439 USA
来源：
JOURNAL OF PHYSICS D-APPLIED PHYSICS | 2015年 / 48卷 / 26期
基金：
中国国家自然科学基金;
关键词：
magnetic shape memory alloy; martensitic transformation; external-field-induced structural transformation; SHAPE-MEMORY ALLOYS; FIELD-INDUCED STRAIN; CRYSTAL-STRUCTURE; PHASE-TRANSFORMATION; NIMNGA ALLOYS; SN ALLOYS; X-RAY; DEPENDENCE;
D O I：
10.1088/0022-3727/48/26/265304
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The structural response of coexisting multiple martensites to stress field in a Ni-Mn-Ga multifunctional alloy was investigated by the in situ high-energy x-ray diffraction technique. Stress-induced transformation between coexisting multiple martensites was observed at 110 K, at which five-layered modulated (5M), seven-layered modulated (7M) and non-modulated (NM) martensites coexist. We found that a tiny stress of as low as 0.5 MPa could trigger the transformation from 5M and 7M martensites to NM martensite and this transformation is partly reversible. Besides the transformation between coexisting multiple martensites, rearrangement of martensite variants also occurs during loading, at least at high stress levels. The present study is instructive for designing advanced multifunctional alloys with easy actuation.
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页数：6
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