Mn_(50-x)Cu_(x)Ni_(40)Sn_(10)合金的相变和磁热效应研究  

A Study of Phase Transitions and Magnetocaloric Effects in Mn_(50-x)Cu_(x)Ni_(40)Sn_(10)Alloys

作　　者：胥平哲 陈海峰 夏紫璐 房勇 韩志达[1,2] XU Pingzhe;CHEN Haifeng;XIA Zilu;FANG Yong;HAN Zhida(School of Electronic and Information Engineering,Changshu Institute of Technology,Changshu 215500,China;Jiangsu Laboratory of Advanced Functional Materials,Changshu Institute of Technology,Changshu 215500,China)

机构地区：[1]常熟理工学院电子信息工程学院,江苏常熟215500 [2]常熟理工学院江苏省新型功能材料重点建设实验室,江苏常熟215500

出　　处：《常熟理工学院学报》2025年第2期17-20,70,共5页Journal of Changshu Institute of Technology

基　　金：国家自然科学基金项目“Ni-Mn基铁磁形状记忆合金的低温相分离和交换偏置效应研究”(51371004)。

摘　　要：本文研究了高锰含量Mn_(50-x)Cu_(x)Ni_(40)Sn_(10)合金中Cu替代部分Mn对晶体结构、马氏体相变和磁热效应的影响.Cu对Mn的替代使马氏体相变温度升高,此现象可归因于价电子浓度的提升.Cu掺杂使马氏体相变伴随的磁性的变化更为陡峭,从而使磁熵变大大增强.Mn_(48)Cu_(2)Ni_(40)Sn_(10)在5 T磁场下的磁熵变达到了52.5 J/kg·K.This study investigates the influence of partially substituting Mn with Cu on the crystal structure,phase transitions,and magnetic entropy change in high-Mn-content Mn_(50-x)Cu_(x)Ni_(40)Sn_(10)alloys.The results indicate that the martensitic transformation temperature increases progressively with higher Cu content,which can be attributed to the rise in valence electron concentration.Moreover,the doping of Cu significantly sharpens the magnetic changes associated with the martensitic transformation,leading to a substantial enhancement of the magnetic entropy change.Notably,the Mn_(48)Cu_(2)Ni_(40)Sn_(10) alloy exhibits a magnetic entropy change of 52.5 J/kg·K under a 5 T magnetic field.

关 键 词：铁磁形状记忆合金 马氏体转变 磁热效应 磁熵变 

分 类 号：O482.6[理学—固体物理]