Grinding-induced martensite stabilization in Mn50Ni 33.5Sn8Co8.5 alloy

G. Li, Z. Liu, X. Ma, S.Y. Yu, Yinong Liu

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Abstract

We found that the martensitic transformation in Mn50Ni 33.5Sn8Co8.5 alloy is very sensitive to the surface stress produced during grinding. The grinding-induced martensite in a Mn50Ni33.5Sn8Co8.5 alloy is found to be more thermally stable than the thermally-induced martensite, as indicated by a large increase in the reverse transformation temperature and its latent heat. Annealing the stress-induced martensite was found effective in restoring the austenite structure. The stress-induced martensite was also found to exhibit much enlarged coercive force of 3 kOe, compared to 330 Oe for the thermally-induced undeformed martensite. This was attributed to the pinning of domain walls by internal stress. These observations were noted in contrast to that observed in most NiMn-based ferromagnetic martensitic alloys. © 2013 Elsevier B.V.
Original languageEnglish
Pages (from-to)239-242
JournalMaterials Letters
Volume107
DOIs
Publication statusPublished - 2013

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