Large field-induced strains in ferromagnetic shape memory materials
Large field-induced strains in ferromagnetic shape memory materials
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DOI：
10.1016/s0921-5093(99)00364-0
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发表时间：
1999-12
期刊：
影响因子：
6.4
通讯作者：
R. James;R. Tickle;M. Wuttig
中科院分区：
文献类型：
--
作者：
R. James;R. Tickle;M. Wuttig
我们研究了铁磁形状记忆材料中的磁致伸缩所造成的重新分配的孪生带响应于外加磁场。介绍了Ni-24at%Mn-24.7at%Ga合金中应变随磁场变化的最新测量结果。我们报告的应变约0.5%下循环应用的领域，和场诱导的应变约4%的标本，已事先通过应力下的马氏体相变冷却。这些测量值和理论计算值之间的比较揭示了一个差异。我们假设这是由于磁化旋转，伴随着每个带内的马氏体细磁畴的形成。
We study magnetostriction in ferromagnetic shape memory materials caused by a redistribution of twin bands in response to an applied magnetic field. Recent measurements of strain versus magnetic field in Ni-24 at% Mn-24.7 at% Ga are presented. We report strains of about 0.5% under cyclic application of a field, and field-induced strains of about 4% on specimens that have been previously cooled through the martensitic transformation under stress. A comparison between these measurements and theoretical calculations reveals a discrepancy. We hypothesize that this is due to magnetization rotation, accompanied by the formation of fine magnetic domains within each band of martensite.