Magnetic and magnetomechanical properties of Ni2MnGa

被引:486
作者
Tickle, R [1 ]
James, RD [1 ]
机构
[1] Univ Minnesota, Dept Aerosp Engn & Mech, Minneapolis, MN 55455 USA
基金
美国国家科学基金会;
关键词
ferromagnetic shape memory; giant magnetostrictive materials; uniaxial magnetocrystalline anisotropy; cubic-to-tetragonal transformation; magnetomechanical properties;
D O I
10.1016/S0304-8853(99)00292-9
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Magnetocrystalline anisotropy and magnetostrictive properties are reported for the austenitic and martensitic phases of ferromagnetic shape memory Heusler alloy Ni2MnGa. In the low-temperature martensitic phase, the phenomenon of field-induced variant rearrangement provides a mechanism which can produce large strains, while at the same time causing anomalous effects in the apparent anisotropy. These anomalies and their effects on measured M-H and torque curves are clarified. Magnetomechanical experiments were performed in the martensitic phase to characterize the work output of a suitably oriented specimen at various stresses, and with proper stress biasing of the initial microstructure produced the largest magnetostrictive strains to date of 4.3%. (C) 1999 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:627 / 638
页数:12
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