Isomagnetic martensitic transformation in Ni2MnGa alloys

被引:28
作者
Glavatska, NI
Ullakko, K
机构
[1] Inst Met Phys, UA-003142 Kiev, Ukraine
[2] Helsinki Univ Technol, Biomed Engn Lab, FIN-02015 HUT, Finland
基金
芬兰科学院;
关键词
magnetic field; kinetics; martensite; strain;
D O I
10.1016/S0304-8853(00)00360-7
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
An effect of the magnetic field on the martensitic transformation and the change in the martensitic variants of the alloy Ni2MnGa containing (at%) 49.6 Ni, 28.4 Mn and 22.0 Ga was studied using X-ray diffraction. It is shown that the applied magnetic field induces martensitic transformation and initiates the development of a preferential martensitic variant. These processes are extended in time, which resembles the isothermal martensitic transformation observed in iron-based alloys. The kinetics of transformation under magnetic field and the after-effect when the field is taken out are studied. The kinetics is shown to depend on the orientation of the applied field in relation to the direction of easy magnetization [1 0 0]. The strain induced by the magnetic field is measured and the time dependence of the strain is Found in consistence with the results of X-ray diffraction study. (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:256 / 260
页数:5
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