热处理对Gd_(0.6)Dy_(0.4)Co_2和Gd_(0.6)Dy_(0.4)Co_(1.9)Al_(0.1)合金磁热性能的影响  

Effect of Heat-treatment on the Magnetocaloric Properties of Gd_(0.6)Dy_(0.4)Co_2 and Gd_(0.6)Dy_(0.4)Co_(1.9)Al_(0.1)

作　　者：吴卫[1] 于越[1] 

机构地区：[1]西华大学材料科学与工程学院,四川成都610039

出　　处：《西华大学学报（自然科学版）》2010年第2期47-49,共3页Journal of Xihua University:Natural Science Edition

基　　金：国家"十五863计划"资助项目(2002AA324010);西华大学四川省材料加工工程重点学科支持

摘　　要：用真空电弧熔炼炉制备Gd0.6Dy0.4Co2和Gd0.6Dy0.4Co1.9Al0.1合金,在900℃下进行4天、7天的热处理后,对其铸态和热处理态的相结构、居里温度、绝热温变、磁熵变等进行了研究。结果表明:经过7天的热处理后合金晶体结构基本变为单相GdCo2结构。热处理的结果使合金的最大绝热温变值比铸态合金有所升高,磁熵变值比铸态合金提高53.2%和33.1%,居里温度略有降低,说明热处理能有效提高该系列合金的磁热性能。Alloys Gd0.6Dy0.4Co2andGd0.6Dy0.4Co1.9Al0.1 were prepared by a vacuum are melting furnace. After heat-treated at 900℃ for 4 days and 7 days, the casting and heat-treated alloys were checked for phases, Curie temperatures, adiabatic temperatures changes and magnetic entropy change. The results reveal that the crystal structure of the alloy becomes to sole GdCo2 structure. Heat- treatment makes the maximum adiabatic temperature of the alloy increase. Compared with casting alloy, the magnetic entropy change of beat-treated alloy increases by 53.2% and 33.1% respectively, and Curie temperature of the alloy decreases slightly. This work shows that the magnetocaloric properties of Gd0.6Dy0.4Co2andGd0.6Dy0.4Co1.9Al0.1 can be effectively improved by heat-treatment.

关 键 词：磁制冷材料 晶体结构 居里温度 磁热性能 

分 类 号：TB64[一般工业技术—制冷工程]