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논문 기본 정보

자료유형
학술저널
저자정보
P. Kameli (Isfahan University of Technology)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.21 No.4
발행연도
2015.1
수록면
758 - 764 (7page)

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In this paper, an attempt has been made to synthesis of the nanostructured Ni47Mn40Sn13 ferromagnetic shape memory alloy by ball milling of Ni, Mn and Sn powder mixture. The structure and magnetic evaluation of samples were investigated by X-ray diffraction, transmission electron microscopy, differential scanning calorimetry and AC susceptibility measurements. The results showed that after 20 hours of ball milling, the nanostructured L21-Ni47Mn40Sn13 powder was formed with an average particle size of 5 nm. In the as-milled specimen, the martensitic transformation (MT) was not observed. This was basically due to the atomic disordering and large lattice strain in nanoparticles. However, the annealing of milled specimens at temperatures above 1023K for 16 hours led to the occurrence of MT in nanostructured Ni47Mn40Sn13 powders. We also calculated t-he activation energy of MT by using Kissinger method and it was estimated to be about 52 kJ mol-1. The results demonstrate that a combination of MA and subsequent heat treatment has the potential to produce Ni-Mn- Sn magnetic shape memory.

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