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采用真空电弧熔炼法和高温淬火法制备了四元哈斯勒合金Ni50-xCuxMn36Sn14(x=0,2,4,6)的化合物。用X射线衍射仪和振动样品磁强计研究了合金的物相与磁热效应。结果表明,部分Cu元素对Ni的替代,并没有改变三元哈斯勒合金Ni-Mn-Sn原有的晶体结构,只是晶格常数开始有减小的趋势,晶胞的体积没有发生太大的变化。M-T曲线的结果表明,该系列哈斯勒合金样品在奥氏体相的铁磁交换作用增强,导致居里温度升高,而结构相变温度降低。此外,通过麦克斯韦方程计算了该系列合金的磁熵变(-ΔSm),在磁场变化为1.5 T的情况下,获得了Ni46Cu4Mn36Sn14合金在330 K附近的最大磁熵变(-ΔSmmax)约为2.0 J·(kg·K)-1。
Quaternary Haslelay Ni50-xCuxMn36Sn14 (x = 0, 2, 4, 6) compounds were prepared by vacuum arc melting and high temperature quenching. The phase and magnetocaloric effect of the alloy were investigated by X-ray diffractometer and vibrating sample magnetometer. The results show that the substitution of some Cu elements for Ni does not change the original crystal structure of the ternary Hasleher Ni-Mn-Sn alloy, but the lattice constant starts to decrease and the unit cell volume does not occur too much The change. M-T curve results show that the series of Hasler alloy samples in the austenite phase of the ferromagnetic exchange enhancement, resulting in Curie temperature, and structural phase transition temperature decreased. In addition, the magnetic entropy change (-ΔSm) of this alloy was calculated by Maxwell’s equation. The maximum magnetic entropy change (-ΔSmmax) of Ni46Cu4Mn36Sn14 alloy near 330 K was obtained at a magnetic field of 1.5 T, which was about 2.0 J · (Kg · K) -1.