摘要
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。
The Ni50-xCuxMn36Sn14(x=0,2,4,6) compounds were prepared by means of arc melting and high-temperature quenching.The structure and the phase transition characteristics of the compounds were investigated by using X-ray diffraction and Vibrating sample magnetometer.X-ray diffraction showed that substitution of Cu for Ni did not change the crystal structure of the ternary Heusler alloy Ni-Mn-Sn,but the lattice constants decreased,and the unit cell volume almost unchanged.Magnetic measurements showed that ferromagnetic exchange interaction enhanced in the austenite phase of the samples,leading to the increase of Curie temperature,while the structural phase transition temperature reduced.The maximal magnetic entropy change ΔSM of the Ni46Cu4Mn36Sn14 alloys was about 2.0 J ·(kg · K)-1,near the 330 K in a field change of 1.5 T.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2012年第3期390-394,共5页
Chinese Journal of Rare Metals
基金
国家自然科学基金资助项目(50961010
51161016)
内蒙古自然科学重点项目(20080404Zd01)
内蒙古师范大学研究生创新基金项目(CXJJS10034)资助
关键词
哈斯勒合金
马氏体相变
居里温度
磁熵变
Heusler alloy
martensitic transformation
Curie temperature
magnetic entropy change