Gd_3Al_(2-x)Ga_x合金的磁热效应研究  

Research on Magnetocaloric Effect of Gd_(3-x)Al_2Ga_xAlloy

作　　者：宋博宇[1] 生利英[1] 闫红伟[2] 

机构地区：[1]包头职业技术学院材料工程系,内蒙古包头014035 [2]包头稀土研究院,内蒙古包头014030

出　　处：《铸造技术》2016年第5期886-889,共4页Foundry Technology

基　　金：内蒙古自治区高等学校科学研究项目(NJZC13359)

摘　　要：以Gd3Al2作为母相,在其中少量添加Ga元素替代部分Al元素,使其形成Gd3Al2-xGax(x=0.1,x=0.2,x=0.3)系列合金,经过热处理后,通过X射线衍射、扫描电镜、振动样品磁强计测量及直接测量等方法进行研究,实验结果表明:Gd3Al2-xGax(x=0.1,x=0.2,x=0.3)系列合金的晶体结构均为Zr3Al2型,主相为Gd3Al2,还有少量的Gd2Al相和Gd Al相。当x=0.2时,Gd3Al2-xGax合金的绝热温变值为2.7 K,比Gd3Al2高0.7 K,居里温度为277 K。少量添加Ga对磁熵变的提高有一定帮助,但对提高居里温度的作用不明显。Taking Gd3Al2 as a parent phase, in which adding a small amount of element Ga replaces part of Al elements to form Gd3Al2-xGax（x=0.1, x=0.2, x=0.3） series alloys, after heat treatment, the crystal structure of the alloys was studied by X-ray diffraction, scanning electron microscopy and direct measurement method. The study results show that Gd3Al2-xGax series alloys are Zr3Al2 type crystal structure, the main phase is Gd3Al2 with a small amount of Gd2 Al phase and Gd Al phase. When x=0.2, the adiabatic temperature change of Gd3Al（2-x）Gaxalloy is 2.7 K, higher than 0.7 K of Gd3Al2, the Curie temperature is 277 K. Adding a small amount of Ga has help to improve the magnetic entropy change, but the change of the Curie temperature is not obvious.

关 键 词：GA 磁制冷 室温磁制冷材料 绝热温变 磁热效应 

分 类 号：TG146.45[一般工业技术—材料科学与工程] TB64[金属学及工艺—金属材料]