Structures and phase transformations in the Heusler-type ferromagnetic shape memory alloys

被引：0

作者：

Tsuchiya, K ^{[1
]}

Nakamura, H ^{[1
]}

Ohtoyo, D ^{[1
]}

Ohtsuka, H ^{[1
]}

Umemoto, M ^{[1
]}

机构：

[1] Toyohashi Univ Technol, Dept Prod Syst Engn, Aichi 4418580, Japan

来源：

PRICM 4: FORTH PACIFIC RIM INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS AND PROCESSING, VOLS I AND II | 2001年

关键词：

martensitic transformation; Curie temperature; magnetostrictive materials; twin boundaries; nickel; manganese; gallium; cobalt; niobium; tin;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Since the discovery of large magnetostriction in Ni2MnGa alloys ferromagnetic shape memory alloys based on the Heusler compounds have been attracting much attention. In the present investigation microstructures and phase transformations in Ni-Mn-Ga and Co-Nb-Sn alloys were studied. In the both alloys, phase transformation temperatures, crystal structures, twin boundary structures and magnetization exhibited a systematic dependence on valence electron concentration, e/a. It was revealed that it is impossible to extend a stable temperature range of the martensite phase and at the same time to increase the magnetization in ternary Ni-Mn-Ga alloys. Addition of Co up to 5 mol% was effective to increase the magnetization with keeping the martensitic transformation temperature constant. In Co-Nb-Sn alloys near the stoichiometric Heusler composition it was not possible to obtain a single phase state. The martensitic transformation temperature is much more insensitive to the composition than in Ni-Mn-Ga alloys.

引用

页码：1665 / 1668

页数：4

共 7 条

[1] Large field-induced strains in ferromagnetic shape memory materials [J].