哈斯勒合金Ni_(50)Mn_(35)In_(15-x)Si_(x)的磁热效应和相变研究  

Research on Magnetocaloric Effect and Phase Transformation of Ni_(50)Mn_(35)In_(15-x)Si_(x) Heusler Alloy

作　　者：许志 刘宏伟 任静 刘永生 XU Zhi;LIU Hongwei;REN Jing;LIU Yongsheng(Department of Mathematics and Physics,Shanghai University of Electric Power,Shanghai 200090,China)

机构地区：[1]上海电力大学数理学院,上海200090

出　　处：《热加工工艺》2022年第22期19-23,29,共6页Hot Working Technology

基　　金：国家自然科学基金项目(11674215,51971128)。

摘　　要：使用熔体快淬法制备了Ni_(50)Mn_(35)In_(15-x)Si_(x)合金样品,使用综合物性测量系统PPMS对样品进行磁性测量;对样品的磁热效应和晶体结构进行了分析。结果表明:Ni_(50)Mn_(35)In_(15-x)Si_(x)哈斯勒合金随着Si掺杂的增大,对合金内部的磁矩产生影响,低温段磁化发生变化,√T_(c)逐渐减小。在√T_(c)处发生的磁相变导致了磁熵较大变化,同时相变温度区间较宽,取得了高的制冷量。5 T的外加磁场下,x=0.8时,在316.6 K时得到最大的制冷量187.92 J/kg,此时的磁熵变达到5.63 J/kg。Ni_(50)Mn_(35)In_(15-x)Si_(x) alloy samples were prepared by melt quenching method, and the magnetic properties were measured by using PPMS, then the magnetocaloric effect and crystal structure of the samples were analyzed. The results show that with the increase of Si doping Ni_(50)Mn_(35)In_(15-x)Si_(x) , Heusler alloy has an impact on the internal magnetic moment of the alloy,the magnetization at low temperature changes, √T_(c) gradually decreases. The magnetic phase change at √T_(c) causes a large change of magnetic entropy, and the wide temperature range of the phase change makes it possible to obtain a high refrigerant capacity. Under the applied magnetic field of 5 T, when x=0.8, at 316.6 K, the maximum refrigerant capacity reaches 187.92 J/kg at this time,and the magnetic entropy change is 5.63 J/kg.

关 键 词：磁热效应 哈斯勒合金 马氏体相变 磁熵变 制冷量 

分 类 号：TG139.6[一般工业技术—材料科学与工程]