Structural and Magnetic Studies in Ni-Mn-Ga based Ferromagnetic Shape Memory Alloys

Defence Science Journal

M. Manivel Raja²  R. K. Singh²  P. Ghosal²  R. P. Mathur²  S. Ray¹  V. Chandrasekaran² 

[1] Indian Institute of Technology Roorkee, Roorkee;Defence Metallurgical Research Laboratory, Hyderabad

关键词: Ferromagnetic shape memory alloys;    Ni-Fe-Mn-Ga alloys;    Martensitic transformation;    Mössbaeur spectroscopy;   

DOI  :  

学科分类：社会科学、人文和艺术（综合）

来源: Defence Scientific Information & Documentation Centre

【 摘 要 】

QuaternaryNi 50 Fe x Mn 30-x Ga 20 ( x= 2.5, 5, and 15) andNi 45 Fe 5 Mn 30 Ga 20 alloys based on modification of ferromagnetic shape memory alloy ternaryNi 50 Mn 30 Ga 20 composition prepared by vacuum arc melting and subsequent heat-treatment were investigated to understand the effect of varyingFe -content inNi - Fe - Mn - Gaalloys. With increasingFe -content, saturation magnetisation and Curie temperature increased, however martensite transformation temperature did not show a systematic variation. The 57 FeMossbauer spectra showed three distinct sub-spectra depending upon the site occupancy byFe -atoms. The results are explained with site selection byFe -atom in parent L21 lattice. Defence Science Journal, 2011, 61(3), pp.275-284 , DOI:http://dx.doi.org/10.14429/dsj.61.645

【 授权许可】

Unknown