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Ni44Mn45Sn10.5Al0.5合金的中间马氏体相变研究
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Abstract:
利用电弧熔炼的方法制备了Al掺杂的Ni44Mn45Sn10.5Al0.5哈斯勒合金样品。磁性测量结果表明，随温度降低样品表现出奥氏体A至马氏体M1、马氏体M1至马氏体M2的分步磁相变；随着外加磁场的升高，奥氏体相的磁矩逐渐增大，在高磁场下，依然表现为分步磁相变，说明该合金样品的中间马氏体相变非常稳定。在50 kOe的外加磁场下，整个相变过程中产生的最大磁熵变为9.66 J？kg？1？K？1，表明该合金样品具有一定的磁制冷能力。以上结果对我们深入认识Ni-Mn-Sn合金的磁热效应以及中间马氏体相变的过程提供了良好基础。
The Al-doped Ni44Mn45Sn10.5Al0.5 Hassler alloy samples were prepared by arc melting method. The magnetic measurement results show that the samples exhibit a stepwise magnetic transformation from austenite A to martensite M1, and from martensite M1 to martensite M2 with decreasing temperature; With the increase of the magnetic field, the magnetic moment of the austenite phase gradually increases. Under the high magnetic field, it still shows a stepwise magnetic transformation, indicating that the intermartensite transformation of the alloy sample is very stable. Under the magnetic field of 50 kOe, the maximum magnetic entropy generated during the whole phase transformation process is 9.66 J？kg？1？K？1, indicating that the alloy sample has a certain magnetic refrigeration ability. The above results provide a good basis for us to deeply understand the magnetocaloric effect of Ni-Mn-Sn alloy and the process of intermartensite transformation.
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