Sn的加入对MnFe(P, Si)合金显微组织和磁性的影响
收稿日期: 2016-04-08
网络出版日期: 2016-11-09
基金资助
资助项目 国际热核聚变实验堆计划项目Nos.2013GB107003和2015GB105003,国家自然科学基金项目Nos.51671045和51601073,中央高校基本科研业务费项目No.DUT16ZD209和西北工业大学凝固技术国家重点实验室开放课题项目No.SKLSP201607
Effect of Sn Addition on Microstructure and Magnetism of MnFe(P, Si) Alloy
Received date: 2016-04-08
Online published: 2016-11-09
Supported by
Supported by National Magnetic Confined Fusion Energy Development (Nos.2013GB107003 and 2015GB105003), National Natural Science Foundation of China (Nos.51671045 and 51601073), Fundamental Research Funds for the Central Universities (No.DUT16ZD209) and Fund of the State Key Laboratory of Solidification Processing in NWPU (No.SKLSP201607)
用高能球磨和固态烧结法制备了Mn1.3Fe0.7P0.5Si0.5-xSnx (x=0、0.02、0.04,原子分数)系列合金,系统研究了Sn的加入对合金显微组织、磁性和磁热效应的影响。结果表明,所有合金中都存在少量的(Fe, Mn)3Si相,在含Sn的合金中,Sn原子并没有进入到Fe2P晶体结构的晶格点阵位置,而是与Mn和Fe形成了Sn2(Mn, Fe)相。Sn的加入也使合金中形成了2种成分的(Fe, Mn)2(P, Si)相,导致样品在升温过程中出现2次铁磁-顺磁转变,对应为2个连续磁熵变峰,从而有利于合金磁制冷温区的扩展和制冷容量的提升。Mn1.3Fe0.7P0.5Si0.5合金具有优异的室温磁热效应,1.5 T磁场变化下的最大磁熵变为12.1 J/(kgK),最大绝热温变为2.4 K,合金的热滞为3 K,Curie温度为273 K,可作为室温磁制冷的理想候选材料。
关键词： Mn1.3Fe0.7P0.5Si0.5-xSnx合金; 显微组织; 室温磁制冷; 磁热效应; 热滞
耿遥祥 , 特古斯 , 汪海斌 , 董闯 , 王宇鑫 . Sn的加入对MnFe(P, Si)合金显微组织和磁性的影响[J]. 金属学报, 2017 , 53(1) : 77 -82 . DOI: 10.11900/0412.1961.2016.00124
This decade has brought an immense interest in room temperature magnetic refrigeration, because it is considered as a type of potential energy saving material and friendly to environment. MnFe(P, Si) magnetic refrigerants materials shows high-performance and relatively low-cost, which paves the effective way for commercialization of magnetic refrigeration and magnetocaloric power-conversion. The present work is devoted to investigating the effect of Sn addition on microstructure, magnetism and magnetocaloric effect on MnFe(P, Si) alloy. Mn1.3Fe0.7P0.5Si0.5-xSnx (x=0, 0.02, 0.04, atomic fraction) alloys were prepared by mechanical alloying (MA) and solid-state reaction methods. The results show that Sn atoms do not enter into the lattice position of Fe2P. The Sn2(Mn, Fe), (Fe, Mn)3Si, Si-riche (Fe, Mn)2(P, Si) and P-riche (Fe, Mn)2(P, Si) matrix phase are formed in Sn-containing alloys. Two different compositions of (Fe, Mn)2(P, Si) phase result in two ferromagnetic-paramagnetic phase transition and two magnetic entropy change (-ΔSm) peaks at the heating process. This result is in favor of expanding the working temperature and refrigerant capacity (RC) of magnetic refrigeration materials. Mn1.3Fe0.7P0.5Si0.5 alloy shows a maximal magnetic-entropy changes (-ΔSmax) of 12.1 J/(kgK) in a magnetic field change of 0~1.5 T, a maximal adiabatic temperature change (ΔTad) of 2.4 K in a magnetic field change of 0~1.48 T and a thermal hysteresis (ΔThys) of 3 K in vicinity of Curie temperature of 273 K, which can be used as a promising candidate material for room-temperature magnetic refrigeration applications.
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