2115 高強度Cu-Al-Mn系超弾性合金の開発(S06-3 形状記憶合金の特性と応用技術(3),S06 形状記憶合金の特性と応用技術)

概要

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Cu-based shape memory alloys (SMAs) of the Cu-Zn- and Cu-Al-based systems are commercially attractive for the manufacture of practical applications based on the shape memory effect (SME) and superelasticity (SE) because of their low cost compared with Ti-Ni (Nitinol) SMAs. However, conventional polycrystalline Cu-based SMAs are too brittle to be sufficiently cold-worked, which restricts the attainable SE strain to only about 2%. During the last decade, we have developed ductile Cu-Al-Mn-based SMAs with excellent shape memory properties. However, the Cu-Al-Mn-based SMAs show low fatigue strength. In the present study, effect of ageing treatment on the mechanical properties for the Cu-Al-Mn-based SMA was investigated by tensile testing. It was seen that the yield stress and the tensile strength of the Cu-Al-Mn-based SMA drastically increase with the ageing without the associated loss in the superelasticity.
社団法人日本機械学会の論文
2007-09-07