Field-induced strain under load in Ni–Mn–Ga magnetic shape memory materials
Field-induced strain under load in Ni–Mn–Ga magnetic shape memory materials
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DOI：
10.1063/1.367758
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发表时间：
1998-10
影响因子：
3.2
通讯作者：
S. J. Murray;M. Farinelli;C. Kantner;J. Huang;S. Allen;R. O'handley
中科院分区：
文献类型：
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作者：
S. J. Murray;M. Farinelli;C. Kantner;J. Huang;S. Allen;R. O'handley
单晶Ni 2 MnGa在−8 °C、8 kOe的磁场下显示出近0.2%的应变。多晶样品已制备近化学计量，研究的磁性和弹性性能的组成依赖性。已经发现组成的窄带具有延伸至室温以上的居里和马氏体转变温度Tc和T0的范围。选择T0略低于室温的样品，研究了在可变横向场中的压缩应力-应变特性。如预期的那样观察到应力诱发马氏体，并且在固定负载下施加磁场以用于各种应力。3200 Oe的横向场导致样品在载荷下应变，随着应力诱导马氏体的体积分数的增加，载荷做功增加到1.3 J/kg。
Single-crystal Ni2MnGa shows a nearly 0.2% strain under a magnetic field of 8 kOe at −8 °C. Polycrystalline samples have been prepared near stoichiometry to study the composition dependence of the magnetic and elastic properties. A narrow band of compositions has been found having a range of Curie and martensitic transformation temperatures, Tc and T0, extending to above room temperature. The compressive stress–strain characteristics in variable transverse field were studied in samples selected to have T0 just below room temperature. Stress-induced martensite was observed as expected and the magnetic field was applied under fixed load for various stresses. A transverse field of 3200 Oe caused the sample to strain under load doing work that increased up to 1.3 J/kg with increasing volume fraction of stress-induced martensite.