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利用真空甩带机制备了成分为Gd_(56-x)Er_xCo_(24)Al20(x=0,16,24,32,40,48)的一系列非晶条带,并用高真空电弧熔炼炉铜模吸铸法制备了直径为3mm的大块非晶合金棒;然后对合金的结构、热稳定性和磁热效应进行了系统研究。研究结果表明,该系列合金有很好的玻璃形成能力、较高的热稳定性以及高的磁熵变(最大可达12.58J·kg~(-1)·K~(-1))和宽的磁熵变曲线峰。当x从0增加到48时,该系列合金在磁场变化为5T条件下制冷能力(RCP)分别是729J·kg~(-1)、736J·kg~(-1)、757J·kg~(-1)、621J·kg~(-1)、576J·kg~(-1)和435J·kg~(-1)。随Er含量的增加,合金磁转变类型从铁磁转变逐步到自旋玻璃转变,磁转变温度从112K降低到16.5K。Gd56-xErxCo24Al20系列的非晶合金优异的磁制冷能力,连续可调的磁转变温区,良好的热稳定性和软磁性能表明这系列合金在10~150K的范围内做为磁制冷材料拥有良好的应用前景。
A series of amorphous ribbons with the composition of Gd_ (56-x) Er_xCo_ (24) Al20 (x = 0,16,24,32,40,48) were prepared by vacuum belt machine and were characterized by high vacuum arc melting furnace copper The bulk amorphous alloy rod with the diameter of 3mm was prepared by die-suction method. The structure, thermal stability and magnetocaloric effect of the alloy were studied systematically. The results show that the alloys have good glass forming ability, high thermal stability and high magnetic entropy change (up to 12.58J · kg -1 · K -1) and wide The magnetic entropy change curve peak. When the temperature increases from 0 to 48, the RCP of the alloy is 729 J · kg -1, 736 J · kg -1 and 757 J · kg -1, respectively, under the magnetic field of 5T. 1, 621J · kg -1, 576J · kg -1 and 435J · kg -1, respectively. With the increase of Er content, the type of magnetic transition of the alloy step by step from the ferromagnetic transition to the spin-glass transition, magnetic transition temperature decreased from 112K to 16.5K. Gd56-xErxCo24Al20 series of amorphous alloy excellent magnetic cooling capacity, continuously adjustable magnetic transition temperature, good thermal stability and soft magnetic properties of this series of alloys in the 10 ~ 150K range as a magnetic refrigeration material has a good The application prospects.