Gd的纯度对Gd_(52.5)Co_(18.5)Al_(29)非晶合金的玻璃形成能力及磁热效应的影响  

Effects of Gd Purity on Glass-Forming Ability and Magnetocaloric Effect of Gd_(52.5)Co_(18.5)Al_(29) Amorphous Alloy

作　　者：郭茂双[1] 付浩[1] 祖小涛[1] 

机构地区：[1]电子科技大学,四川成都610054

出　　处：《稀有金属材料与工程》2011年第7期1243-1246,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50901013)

摘　　要：研究了稀土金属Gd的纯度对Gd52.5Co18.5Al29非晶合金的玻璃形成能力和磁热效应的影响。研究表明Gd的纯度从99.94%下降到99.2%,非晶合金的临界直径从4mm减小到3mm;磁热效应并未随纯度降低而下降,采用高纯和低纯金属Gd制备的Gd52.5Co18.5Al29非晶合金的最大磁熵变和相对制冷量分别为9.4J·kg-1·K-1,8.1×102J·kg-1和9.5J·kg-1·K-1,8.4×102J·kg-1。因此,采用商业低纯Gd制备的Gd-基非晶合金适合作为磁致冷候选工质。Effects of Gd purity on glass-forming ability（GFA） and magnetocaloric effect（MCE） of Gd52.5Co18.5Al29 amorphous alloy were investigated.It is shown that the impurities have an influence on the GFA of Gd52.5Co18.5Al29 glassy alloy rods and the maximum diameters decrease from 4 mm to 3 mm when the purity of Gd decreases from 99.94% to 99.2%.However,no decline of magnetocaloric effect is observed for different-purity alloys and the maximum magnetic entropy changes and relative cooling power of high-purity and low-purity Gd52.5Co18.5Al29 alloys are 9.4 J·kg-1·K-1,8.1×102 J·kg-1 and 9.5 J·kg-1·K-1,8.4×102 J·kg-1,respectively.Therefore,it indicates that lower cost Gd52.5Co18.5Al29 alloy prepared by commercial Gd is promising for further application as magnetic refrigerant.

关 键 词：非晶合金 稀土金属 玻璃形成能力 磁热效应 

分 类 号：TG139.8[一般工业技术—材料科学与工程]