Large internal stress-assisted twin-boundary motion in Ni2MnGa ferromagnetic shape memory alloy

被引:7
作者
Nie, Z. H. [1 ]
Cong, D. Y. [2 ]
Liu, D. M. [3 ]
Ren, Y. [4 ]
Poetschke, M. [2 ]
Roth, S. [2 ]
Wang, Y. D. [1 ]
机构
[1] Beijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China
[2] IFW Dresden, Inst Metall Mat, D-01171 Dresden, Germany
[3] Gen Res Inst Nonferrous Met, State Key Lab Fabricat & Proc Nonferrous Met, Beijing 100088, Peoples R China
[4] Argonne Natl Lab, Xray Sci Div, Argonne, IL 60439 USA
基金
中国国家自然科学基金;
关键词
ferromagnetic materials; gallium alloys; internal stresses; manganese alloys; nickel alloys; nucleation; shape memory effects; thermomagnetic effects; twin boundaries; X-ray diffraction; NI-MN-GA; FIELD-INDUCED STRAIN; MAGNETIC-FIELD; MARTENSITE; PHASE;
D O I
10.1063/1.3645626
中图分类号
O59 [应用物理学];
学科分类号
摘要
The twin boundary motion driven by thermo-magnetic coupling was in-situ studied in a NiMnGa single crystal using high-energy x-ray diffraction technique. An unstable martensite with an internal stress of similar to 8 MPa was obtained through a thermo-magnetic training. The triple martensite variants assisted by internal stress are distinct from the self-accommodated martensite twin variants with a stress-free state, and a single martensite-variant can be actuated only by a magnetic field of similar to 0.34 T, equivalent to an actuator stress of about 1.3 MPa. The generation of so large internal stress among variants is attributed to the altered martensite nucleation sites triggered by external fields during thermo-magnetic training. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3645626]
引用
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页数:3
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