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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.46  No.8 (2005)  >  pp.1745-1748

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Improvement of Oxidation Resistance of an Fe–Mn–Si–Cr Shape Memory Alloy by Annealing under Vacuum

Hiroyuki Fukai1), Shigeru Suzuki1), Naoya Masahashi2), Shuji Hanada2), Tadakatsu Maruyama3), Hiroshi Kubo4) and Yoshio Waseda1)
1) Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
2) Institute for Materials Research, Tohoku University
3) Awaji Sangyo K.K.
4) Kanto Polytechnic College

Electron microprobe microanalysis (EPMA), secondary ion mass spectrometry (SIMS) and X-ray photoelectron spectroscopy (XPS) were used for charactering the surface composition of an Fe–Mn–Si–Cr shape memory alloy. The effect of annealing under vacuum on the surface composition of the alloy was studied. It was found that the amount of manganese decreased, while the amount of chromium increased in a surface layer by annealing. The thickness of the surface layer is of the order of ten micrometers, which is comparable to that obtained by conventional plating or coating. As a result, the surface of the Fe–Mn–Si shape memory alloy annealed under a vacuum exhibited better oxidation resistant than that of the as-lapped alloy.

oxidation, shape memory alloy, secondary ion mass spectrometry, X-ray photoelectron spectroscopy

Received: March 23, 2005
Accepted: May 16, 2005 , Published online: November 14, 2005
Copyright (c) 2005 The Japan Institute of Metals



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