熔体快淬LaFe_(11.85)Si_(1.15)合金磁热性能  

Magnetocaloric Properties of LaFe_(11.85)Si_(1.15) Alloy Prepared by Melt-spinning Method

作　　者：范文兵 侯育花[1] 黄有林[1] 郭开祥 李志浩 钟震晨[2] Fan Wenbing;Hou Yuhua;Huang Youlin;Guo Kaixiang;Li Zhihao;Zhong Zhenchen(Nanchang Hangkong University,Nanchang 330063,China;Jiangxi University of Science and Technology,Ganzhou 341000,China)

机构地区：[1]南昌航空大学,江西南昌330063 [2]江西理工大学,江西赣州341000

出　　处：《稀有金属材料与工程》2019年第1期323-328,共6页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51401103;11304146;51564037);江西省自然科学基金(20161BAB206110);江西省教育厅科学技术项目(GJJ160713)

摘　　要：通过电弧熔炼、熔体快淬及后续热处理,制备出了具有大磁熵变和磁滞损耗小的LaFe_(11.85)Si_(1.15)合金薄带。研究了不同热处理工艺对合金薄带物相组成、微观结构演变、磁熵变、居里温度及巡游电子变磁转变的影响。结果表明,不同退火时间对合金的1:13相含量和磁热效应影响显著,其中退火10 h所制薄带的1:13相含量最高,磁熵变最大,其在0～5 T磁场变化下,磁熵变(ΔS)和制冷能力(Rc)分别可达20.54 J×kg^(-1)×K-1和417.21 J×kg^(-1),且具有明显的磁场诱导巡游电子变磁转变现象。而退火时间较短则不利于1:13相的形成,退火时间过长会引起1:13相的分解和α-Fe相含量的增加。LaFe11.85Si1.15 ribbons with large magnetic entropy change and minor magnetic hysteresis were prepared by a melt-spinningtechnique followed by heat treatment. The influences of different heat treatment processes on phase constitution, microstructure evolution,magnetic entropy change, Curie temperature and itinerant electron metamagnetic transitions were investigated. The results show that theannealing time has a great influence on the content of 1: 13 phase and magnetocaloric effect. For LaFe11.85Si1.15 alloy annealed at 1050 oC for 10 h, the maximum magnetic entropy change(△SM) value of 20.54 J×kg-1×K-1 and the refrigerating capacity(RC) of 417.21 J×kg-1 can beacquired due to the high content of 1:13 phase in the magnetic field of 0~5 T, and the obvious itinerant electron metamagnetic transitioncan be observed. The shorter annealing time is not beneficial to the formation of 1:13 phase. However, too long annealing time leads to thedecomposition of 1:13 phase and the increase of α-Fe phase.

关 键 词：熔体快淬 磁热效应 磁熵变 制冷能力 

分 类 号：TM271[一般工业技术—材料科学与工程]