Structure and magnetic properties of Ni2(Mn,Co)Ga Heusler alloys rapidly solidified by melt-spinning

被引：7
作者：
Prasad, R. V. S. [1 ]
Raja, M. Manivel [2 ]
Phanikumar, G. [1 ]
机构：
[1] Indian Inst Technol Madras, Dept Met & Mat Engn, Madras 600036, Tamil Nadu, India
[2] Def Met Res Lab, Adv Magnet Mat Grp, Hyderabad 500058, Andhra Pradesh, India
来源：
INTERMETALLICS | 2012年 / 25卷
关键词：
Magnetic intermetallics; Phase identification; Rapid solidification processing; Microstructure; Phase stability; SHAPE-MEMORY ALLOYS; MN-GA ALLOYS; PHASE-EQUILIBRIA; MARTENSITIC-TRANSFORMATION; FE; MICROSTRUCTURE; SYSTEM; DIFFRACTION; STABILITY; BEHAVIOR;
D O I：
10.1016/j.intermet.2012.02.012
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：
In this study microstructure and magnetic properties of cobalt substituted Ni2MnGa based ferromagnetic shape memory alloys (FMSA) are presented. Ni50Mn(25-x)CoxGa25 (x = 2, 5, 8, 11 at%) alloys were synthesized using the melt-spinning technique. Martensite, austenite and pre-martensitic tweed structures were found at room temperature for alloys containing 2, 5, 8 and 11% Co and melt-spun at two extreme wheels speeds viz., 20 m/s and 30 m/s. However, the alloy containing 5% Co melt-spun at a wheel speed of 20 m/s consists of 7 M or 14 layered Martensite phase. Magnetic properties such as saturation magnetization (Ms), martensitic transformation temperature (T-m) and Curie temperature (T-c) were measured and were found to be attractive for most of the melt-spun alloys containing higher "Co" concentrations. Upon annealing at 1273 K for 1 h, gamma (gamma) phase was found to stabilize. The magnetic properties were found to correlate with the phase content of the Co substituted alloys. (c) 2012 Elsevier Ltd. All rights reserved.
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页码：42 / 47
页数：6
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