Ni50-xCoxMn39Sn11(x = 0-8)合金薄带的微观结构，马氏体相变和磁热性质研究

Microstructure, martensitic transformation and magne-tocaloric effect of Ni50-xCoxMn39Sn11(x = 0-8) Heusler alloy ribbons

摘要:

用单辊溶体快淬法制备了一系列的Ni50-xCoxMn39Sn11 (x = 0-8)合金薄带，并研究了它的晶体结构、相转变和磁热效应。随着Co对Ni取代量的增加，马氏体转变温度下降明显，居里温度呈线性增加。马氏体结构转变不仅可以通过温度来诱发，也可以通过磁场来驱动。磁场强度为30 kOe时，在升温和降温过程均得到了大的磁熵变和磁制冷能力值，并且在降温过程的磁滞损耗很低。

Abstract:

Abstract: A series of Ni50-xCoxMn39Sn11 (x = 0-8) alloy ribbons were prepared by a single-roll melt spinning method and its crystal structure, phase transition, and magnetocaloric effect are investigated. The martensitic transformation temperatures decrease rapidly and the Curie temperature of austenitic phase increases monotonously with the substitution of Ni by Co. The structural transformation can be induced not only by the temperature, but also by the magnetic field. Under field change of 30 kOe, we get large magnetic entropy change and refrigerant capacity in the heating process and cooling process with much lower hysteresis loss.