摘要
为改善磁制冷工质的制备工艺从而提高实用化进程,提出了一种室温下冷压塑性变形加速磁热相形成的方法。对La_(0.6)Pr_(0.4)Fe_(10.7)Co_(0.8)Si_(1.5)合金的晶粒结构、相组成和磁热效应进行了系统的研究。结果表明,经过预变形,合金单位面积上晶粒数量增加且晶粒尺寸均匀,相比于未压缩样品,在相同条件下退火后磁热相比例增加。当压缩率为30%时,经3天的短时间退火后,1∶13相的比例可达92.68%(体积分数),明显高于未变形样品。30%预变形La_(0.6)Pr_(0.4)Fe_(10.7)Co_(0.8)Si_(1.5)样品居里温度为289 K,在2 T磁场下磁熵变为-7.1 J/(kg·K),可作为室温区实用的磁制冷材料备选工质。
In order to improve the preparation process and practical process of magnetic refrigerant,a method of accelerating phase formation by cold compression plastic deformation at room temperature was proposed.The grain structure,phase composition and magneto-thermal effects of La_(0.6)Pr_(0.4)Fe_(10.7)Co_(0.8)Si_(1.5) alloy were systematically studied.The results show that with the increase of compression ratio,the number of grains per unit area increases and the grain size is uniform.Compared with the uncompressed sample,the proportion of magnetothermal phase increases after annealing under the same conditions.When the compression rate is 30%,the ratio of 1∶13 phase after 3 days annealing is 92.68%(volume fraction),and the pre deformed sample is obviously better than the undeformed sample.After annealing for 3 days,the Curie temperature(TC)of 30% pre-deformed La_(0.6)Pr_(0.4)Fe_(10.7)Co_(0.8)Si_(1.5) is 289 K,and the magnetic entropy change(ΔS_(max))is-7.1 J/(kg·K)under 2 T magnetic fields.The suitable Curie temperature and value of ΔS_(max) make it an attractive potential candidate for the room temperature magnetic refrigeration application.
作者
杨旭
傅斌
韩洁
张联齐
YANG Xu;FU Bin;HAN Jie;ZHANG Lianqi(School of Materials Science and Engineering,Tianjin University of Technology,Tianjin 300384,China;School of Science,Tianjin University of Technology,Tianjin 300384,China)
出处
《材料工程》
EI
CAS
CSCD
北大核心
2023年第11期189-196,共8页
Journal of Materials Engineering
基金
天津市自然科学基金项目(18JCQNJC02500)。
