金属单质对Gd_(3)Al_(2)合金磁热效应的影响  

Influence of metallic monomers on magnetocaloric effect in Gd_(3)Al_(2) alloy

作　　者：生利英[1] SHENG Liying(Material Engineering Department,Baotou Vocational and Technical College,Baotou 014030,Inner Mongolia,China)

机构地区：[1]包头职业技术学院材料工程系,内蒙古包头014030

出　　处：《金属功能材料》2022年第5期73-76,共4页Metallic Functional Materials

基　　金：内蒙古自治区高等学校科学研究项目资助(NJZC13359)。

摘　　要：利用真空高频磁悬浮炉和热处理工艺制备了Gd_(3)Al_(2-x)Ga_(x)、Gd_(3-x)Mn_(x)Al_(1.8)Ga_(0.2)、Gd_(3-x)Mn_(x)Al_(2)和Gd_(3-x)Zn_(x)Al_(2)样品,研究了在1.5T磁场下,金属单质Ga、Mn和Zn对Gd_(3)Al_(2)合金磁热效应和结构的影响。结果表明,微量金属单质不影响Gd_(3)Al_(2)合金的晶体结构;少量Ga替代Al可以提高Gd_(3)Al_(2)合金的绝热温变;在Gd_(3)Al_(1.8)Ga_(0.2)样品的基础上,添加Mn替代Gd,居里温度提高,绝热温变几乎保持不变;少量Mn和Zn替代Gd使Gd_(3)Al_(2)合金的居里温度提高到室温附近,降低最大绝热温变。Gd_(3)Al_(2-x)Ga_(x),Gd_(3-x)Mn_(x)Al_(1.8)Ga_(0.2),Gd_(3-x)Mn_(x)Al_(2)samples were prepared by high-frequency floating furnaceand and heat treatment process. The effect of Ga, Mn and Zn on the magnetocaloric effect and structure of Gd_(3)Al_(2)alloy was studied at the magnetic field of 1.5 Tesla. The results showed that the crystal structure of Gd_(3)Al_(2)alloy was not affected by metallic elements, the maximum adiabatic temperature changes of Gd_(3)Al_(2)alloy could be increased by a small amount of Ga instead of Al, the Curie temperature could be increased by a small amount of Mn instead of Gd on the basis of Gd_(3)Al_(2)Ga,and the maximum adiabatic temperature change of Gd_(3)Al_(2)alloy was almost unchanged and the maximum adiabatic temperature change of Gd_(3)Al_(2)alloy decreased when a small amount of Mn and Zn was substituted for Gd, and the Curie temperature of Gd_(3)Al_(2)alloy increased.

关 键 词：Ga、Mn和Zn Gd_(3)Al_(2)合金 绝热温变 居里温度 直接测量 

分 类 号：TG132.27[一般工业技术—材料科学与工程]