MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
Shape Memory Effect Associated with FCC—HCP Martensitic Transformation in Co-Al Alloys
Toshihiro OmoriYuji SutouKatsunari OikawaRyosuke KainumaKiyohito Ishida
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2003 Volume 44 Issue 12 Pages 2732-2735

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Abstract

The martensitic transformation and shape memory (SM) effect in Co-Al alloys containing 0–16 at%Al were investigated by differential scanning calorimetry (DSC) and bending tests. It was found that the martensitic transformation temperatures decrease and the thermal hystereses increase with increasing Al content. It was also found that an incomplete SM effect occurring in pure Co can be enhanced by the addition of Al over 4 at% and that Co-Al alloys containing Al over 10 at% show an excellent SM effect. Co-Al SM alloys possessing high reverse transformation temperatures over 200°C and martensitic transformation in the ferromagnetic state show promise as a new type of SM alloys.

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© 2003 The Japan Institute of Metals and Materials
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