Preparation and characterization of ferromagnetic shape memory alloys

被引：1
|
作者：
Gupta, P
Robi, PS [1 ]
Singha, PP
Srinivasan, A
机构：
[1] Indian Inst Technol, Dept Mech Engn, N Guwahati 781039, India
[2] Indian Inst Technol, Dept Phys, Gauhati 781039, India
来源：
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY | 2004年 / 153卷
关键词：
FSMA; Ni-Mn-Ga; polycrystalline; microstructure;
D O I：
10.1016/j.jmatprotec.2004.04.364
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Ferromagnetic shape memory (FSM) alloy of Ni2MnGa was prepared by melt casting technique. Equiaxed grained and columnar structures were obtained. The structure of the cast alloy revealed a twinned structure. In situ study of the structure during heating revealed the martensitic to austenitic transformation taking place in the temperature range of 160-300 degreesC. At temperatures above 550 degreesC, a second reaction was found to take place. The activation energy for this reaction was determined to be 80 kJ/mol by differential scanning calorimeter (DSC). The field-induced strain for the material in the polycrystalline form was 0.18 x 10(-4) at room temperature. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码：965 / 970
页数：6
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