Isothermal martensitic transformation in polycrystalline Ni50Mn29Ga21

被引：18
|
作者：
Huerrich, C. [1 ]
Roth, S. [1 ]
Poetschke, M. [1 ]
Rellinghaus, B. [1 ]
Schultz, L. [1 ,2 ]
机构：
[1] IFW Dresden, Inst Metall Mat, D-01069 Dresden, Germany
[2] Tech Univ Dresden, Inst Mat Sci, Dept Mech Engn, D-01062 Dresden, Germany
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2010年 / 494卷 / 1-2期
关键词：
Magnetic shape memory (MSM); Polycrystalline Ni-Mn-Ga; Martensitic transformation; JMAK theory; NI-MN-GA; SHAPE-MEMORY; HYDROSTATIC PRESSURE; MAGNETIC-FIELD; ALLOY;
D O I：
10.1016/j.jallcom.2010.01.044
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The isothermal transformation behaviour of polycrystalline Ni50Mn29Ga21 magnetic shape memory alloy is investigated by measuring the saturation magnetisation as a function of time and temperature. The results are analysed within the framework of the Johnson-Mehl-Avrami-formalism. The samples were prepared by directional solidification with a (1 0 0) texture of the high temperature cubic phase parallel to the heat flow. The samples were heat treated for chemical homogenization and stress relaxation in the austenitic state. They show a thermal hysteresis of martensite to austenite and the reverse transformation. The hysteresis becomes smaller with increasing measurement time. Grain boundary nucleation is a time controlling mechanism during the isothermal transformation in a constant magnetic field in these alloys. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码：40 / 43
页数：4
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