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Meeting

2026 TMS Annual Meeting & Exhibition

Symposium

Late News Poster Session

Presentation Title

G-33: In Situ Micro-XAFS Study on Stress-Induced Multistage Martensitic Transformation in Cu–Al–Mn Superelastic Alloys

Author(s)

Kakeru Ninomiya, Zheyuan Liang, Hiroshi Akamine, Maiko Nishibori

On-Site Speaker (Planned)

Kakeru Ninomiya

Abstract Scope

Cu–Al–Mn-based superelastic alloys show stress-induced multistage martensitic transformations. Because of their low cost and excellent workability, they are expected to be used in applications such as seismic-resistant materials where Ni–Ti alloys are unsuitable. In this study, the mechanism of the stress-induced multistage transformation was investigated by in situ micro-XAFS measurements under tensile loading, focusing on the region where the martensitic transformation first occurred. Spectra corresponding to the parent, 6M, and 2M phases were successfully obtained at the Mn K-edge. A comparison between heat-treated and untreated samples showed that spectral changes in the parent and 2M phases were small, whereas the 6M phase exhibited significant differences. EXAFS analysis of the 2M phase revealed that specific interatomic distances increased in the untreated sample but decreased after heat treatment. These findings provide important insights into the martensitic transformation mechanism governing shape-memory behavior.

Proceedings Inclusion?

Undecided

Keywords

Copper / Nickel / Cobalt, Mechanical Properties, Other

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