Enhanced formation and improved thermal stability of ferromagnetic τ phase in nanocrystalline Mn55Al45 alloys by Co addition

被引:15
作者
Xiang, Zhen [1 ]
Song, Yiming [1 ]
Deng, Baiwen [1 ]
Cui, Erbiao [2 ]
Yu, Lunzhou [2 ]
Lu, Wei [1 ]
机构
[1] Tongji Univ, Shanghai Key Lab D&A Met Funct Mat, Sch Mat Sci & Engn, Shanghai 201804, Peoples R China
[2] Univ Shanghai Sci & Technol, Sch Mat Sci & Engn, Shanghai 200093, Peoples R China
基金
中国国家自然科学基金;
关键词
Rare-earth-free permanent magnet; MnAl alloy; Direct formation; Thermal stability; Co doping; MAGNETIC-PROPERTIES; MICROSTRUCTURAL EVOLUTION; TRANSFORMATION KINETICS; PERMANENT-MAGNETS; MNAL-C; ENERGY; COERCIVITY; HEAT;
D O I
10.1016/j.jallcom.2018.12.350
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
MnAl alloy (tau phase) is one of the most promising rare-earth-free permanent magnets due to its remarkable magnetic properties. The metastable tau phase is normally produced by rapid quenching technique and subsequent heat treatments. In this work, the direct formation of pure tau phase in (Mn0.55Al0.45)(97)Co-3 alloy was achieved by using the melt-spinning process without heat treatments, which showed the magnetization of 5.0 x 10(5) A/m, coercivity of 125.6 ItA/m and maximum energy product of 6.2 kJ/m(3). It was found that the negative mixing enthalpy and the different atomic radius between Co and Mn, Al played a key role in improving the formation and stability of the tau phase in MnAlCo alloys. As a result, Co doping promoted the formation of and enhanced the stability of the tau phase in MnAl alloy. The present results will be helpful for the direct formation of ferromagnetic tau phase in MnAl rare-earth-free permanent magnet. (C) 2018 Elsevier B.V. All rights reserved.
引用
收藏
页码:416 / 422
页数:7
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