对经真空高频磁悬浮炉熔炼、900℃30 h热处理的Gd3 Al2-XGax(x=0,0.1,0.2,0.3)系列合金的组织结构和磁热效应进行了研究.研究发现,Gd3Al2-XGax系列合金保持了Gd3Al2的简单正方晶体结构,热处理后基相Gd3Al2的含量增加,随着Ga含量的增加,Gd3Al2-XGax合金的居里温度变化在1K～2K之间,在1.5T的外加磁场下,△Sm-T曲线半峰宽几乎不变,Gd3Al1.8Ga0.2合金的最大磁熵变最大,超过Gd3Al2的最大磁熵变30％.少量Ga替代Al可以提高Gd3Al2合金的磁热效应.
The organization structure and the magnetocaloric effect of Gd3 Al2-x Gax (0.1 x =0,0.2,0.3) series alloy prepared by smelting in a a high-frequency floating furnace and annealing treatment at 900 ℃ for 30 h were investigated.The results show that Gd3Al2-xGax series alloy keeps simple tetragonal crystal structure of Gd3Al2.The content of base phase Gd3Al2 increases after heat treatment.The Curie temperature of Gd3 Al2-xGaxseries alloy changes between 1 K ～ 2 K along with the increase of the content of Ga.The half peak width of △Sm-T curve is almost the same.The maximum magnetic entropy changes of Gd3Al1.8Ga0.2 alloy is the largest under magnetic field changes of 1.5 T,which exceeds 30％ of Gd3Al2 alloy.A small amount of Ga to replace Al can improve the magnetocaloric effect of Gd3Al2 alloy.
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