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

页码：40 / 43

页数：4

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