Sn的加入对MnFe(P, Si)合金显微组织和磁性的影响

doi:10.11900/0412.1961.2016.00124

金属学报

2017, Vol. 53

Issue (1): 77-82 DOI: 10.11900/0412.1961.2016.00124

本期目录 | 过刊浏览

Sn的加入对MnFe(P, Si)合金显微组织和磁性的影响

耿遥祥¹(

),特古斯²,汪海斌¹,董闯³,王宇鑫¹

1 江苏科技大学材料科学与工程学院镇江 212003
2 内蒙古师范大学内蒙古自治区功能材料物理与化学重点实验室呼和浩特 010022
3 大连理工大学三束材料改性教育部重点实验室大连 116024

Effect of Sn Addition on Microstructure and Magnetism of MnFe(P, Si) Alloy

Yaoxiang GENG¹(

),Ojied TEGUS²,Haibin WANG¹,Chuang DONG³,Yuxin WANG¹

1 School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China
2 Inner Mongolia Key Laboratory for Physics and Chemistry of Functional Materials, Inner Mongolia Normal University, Hohhot 010022, China
3 Key Lab of Materials Modification by Laser, Ion and Electron Beams, Ministry of Education, Dalian University of Technology, Dalian 116024, China

引用本文:

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.
Yaoxiang GENG, Ojied TEGUS, Haibin WANG, Chuang DONG, Yuxin WANG. Effect of Sn Addition on Microstructure and Magnetism of MnFe(P, Si) Alloy[J]. Acta Metall Sin, 2017, 53(1): 77-82.

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摘要:

用高能球磨和固态烧结法制备了Mn_1.3Fe_0.7P_0.5Si_0.5-_xSn_x (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。Mn_1.3Fe_0.7P_0.5Si_0.5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

Abstract：

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. Mn_1.3Fe_0.7P_0.5Si_0.5-_xSn_x (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 (-ΔS_m) peaks at the heating process. This result is in favor of expanding the working temperature and refrigerant capacity (RC) of magnetic refrigeration materials. Mn_1.3Fe_0.7P_0.5Si_0.5 alloy shows a maximal magnetic-entropy changes (-ΔS_max) of 12.1 J/(kgK) in a magnetic field change of 0~1.5 T, a maximal adiabatic temperature change (ΔT_ad) of 2.4 K in a magnetic field change of 0~1.48 T and a thermal hysteresis (ΔT_hys) 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.

Key words： Mn1.3Fe0.7P0.5Si0.5-xSnx alloy, microstructure, room temperature magnetic refrigeration, magnetocaloric effect, thermal hysteresis

收稿日期: 2016-04-08

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

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https://www.ams.org.cn/CN/10.11900/0412.1961.2016.00124 或 https://www.ams.org.cn/CN/Y2017/V53/I1/77

图1 Mn1.3Fe0.7P0.5Si0.5-xSnx (x=0、0.02、0.04,原子分数)系列粉末合金的XRD谱

图2 Mn1.3Fe0.7P0.5Si0.5和Mn1.3Fe0.7P0.5Si0.46Sn0.04合金的SEM像

图3 Mn1.3Fe0.7P0.5Si0.5-xSnx合金在0.05 T磁场下的磁化强度M随温度T变化曲线和dM/dT曲线

图4 Mn1.3Fe0.7P0.5Si0.5和Mn1.3Fe0.7P0.5Si0.46Sn0.04合金的等温磁化(M-B)曲线

图5 Mn1.3Fe0.7P0.5Si0.5-xSnx系列合金在0~1.5 T磁场变化下的等温磁熵变(-ΔSm)曲线和Mn1.3Fe0.7P0.5Si0.5合金在0~1.48 T磁场下的绝热温变(ΔTad)曲线

表1 Mn1.3Fe0.7P0.5Si0.5-xSnx系列合金富Si的(Fe, Mn)2(P, Si)相的Curie温度(Tc1)、基体相Curie温度(Tc2)、基体相热滞(ΔThys)、富Si的(Fe, Mn)2(P, Si)相的最大磁熵变(-ΔSmax1)、基体相最大磁熵变(-ΔSmax2)、制冷容量(RC)和最大绝热温变(ΔTadmax)

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