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Free keywords:
Precipitation (chemical), Austenite phase; Elevated temperature; High temperature; Micromechanical characterization; Plastic regimes; Pseudoelastic behaviors; Residual strains; Transformation temperatures, Shape memory effect
Abstract:
The microthermomechanical behavior of a precipitation-hardenable Ni-48Ti-25Pd (at.) shape memory alloy has been investigated as a function of temperature. Micropillars were fabricated within a large 〈145〉-oriented grain and compressed in situ in the SEM at elevated temperatures corresponding to the martensite and austenite phase transformation temperatures. The precipitation-strengthened alloys exhibited stable pseudoelastic behavior with little or no residual strains when near the transformation temperatures. In the plastic regime, slip was observed to occur via pencil glide, circumventing the fine scale precipitates along multiple slip planes. © 2015, The Minerals, Metals Materials Society.