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材料工程  2005 

预加压应力对Ni-Mn-Ga-RE(RE=Tb,Sm)合金磁感生应变的影响

Keywords: Ni-Mn-Ga合金,预加压应力,稀土,磁致应变,形状记忆合金

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Abstract:

研究了稀土元素Tb和Sm对Ni-Mn-Ga磁性形状记忆合金的马氏体相变及磁致应变的影响,并着重研究了预加压应力对合金磁致应变的影响作用。结果发现,微量的稀土元素Tb和Sm的掺入,降低了合金的马氏体相变温度和居里温度。在施加一定的预加压应力后,其磁致应变值有大幅提高,并且大预加压应力在较低磁场下不能使合金产生最大磁致应变,但能够使合金在高磁场作用下获得大磁致应变,所以施加适当的预加压应力是提高合金磁致应变的有效方法。

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