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在氩气气氛中用熔炼法制备了Gd100-xNbx(x=0,1,2,3,5)系列合金,铸锭经1273K均匀化退火96h后水淬至室温。结果表明:Gd100-xNbx系列合金仍保持纯Gd的六方相结构;Nb掺杂合金的居里温度比纯Gd均低2K,在居里点附近发生的磁性转变为二级相变,5T外场下的最大磁熵变约为纯Gd的85%。通过少量Nb(≤5at%)掺杂后,Gd100-xNbx系列合金的显微硬度明显得到提高,与纯Gd相比,显微硬度最大提高幅度达～53%(x=5)。含少量Nb的Gd100-xNbx合金具有较大的磁熵变和较好的加工性能,是一类有很大应用潜力的室温磁致冷材料。
Gd100-xNbx (x = 0, 1, 2, 3, 5) alloy was prepared by smelting in argon atmosphere. The ingot was homogenized and annealed at 1273K for 96h, then quenched to room temperature. The results show that the Gd100-xNbx alloy maintains the pure Gd hexagonal structure. The Curie temperature of the Nb-doped alloy is 2K lower than the pure Gd, and the magnetic transition near the Curie point is the second-order phase transition. The maximum magnetic entropy change is about 85% of pure Gd. The microhardness of the Gd100-xNbx alloy was obviously improved by adding a small amount of Nb (≤5at%). The maximum increase of microhardness was ~ 53% (x = 5) compared with pure Gd. Gd100-xNbx alloy containing a small amount of Nb has a large magnetic entropy change and good processing properties, and is a kind of room temperature magnetic refrigeration material with great potential for application.