MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
AFM Observation of Microstructural Changes in Fe-Mn-Si-Al Shape Memory Alloy
Motomichi KoyamaMasato MurakamiKazuyuki OgawaTakehiko KikuchiTakahiro Sawaguchi
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2008 Volume 49 Issue 4 Pages 812-816

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Abstract

We analyzed the surface relief caused by stress-induced hcp martensitic transformation in Fe-30Mn-5Si-1Al shape memory alloy by atomic force microscopy. The alloy exhibits a good shape memory effect and an improved ductility due to a small addition of Al to a conventional Fe-30Mn-6Si shape memory alloy. The orientation of an austenite matrix was determined with surface traces of four {111}f planes, which enabled us to determine the surface tilt angles for all twelve variants of hcp martensites and deformation twins. On the basis of these values, stress-induced martensite and deformation twin coexisting in the same grain were identified by studying the surface tilt angles. The surface relieves caused by the stress-induced martensite recovered after heating above the reversed transformation temperature, however some relieves originating from the deformation twin remained.

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© 2008 The Japan Institute of Metals and Materials
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