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28 March 2012 Evolution of phase transformation and reorientation during stress arrest in shape memory alloys
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Abstract
Stress arrest of loading or unloading during pseudoelastic phase transformations in shape memory alloys has shown to exhibit creep-like phenomenon even at strain rates that can be considered quasi-static and devoid of any thermal effects. This phenomenon termed as pseudo-creep is manifested as positive (negative) accumulation in strain during loading (unloading) when arrested at constant stress. Pseudo-creep is also found to occur during reorientation loading, where thermomechanical coupling is absent. In this paper, we report results of extensive studies conducted on poly-crystal Ni-Ti wires for stress arrest of loading and unloading at normalized strain rates ranging from 4.25E-7 (virtually isothermal conditions) to 4.25E-5 in conjunction with a video multi-extensometry technique developed in our laboratory to measure spatially non-uniform deformations in the sample and have recorded evolution in phase transformations or reorientation in three consecutive segments of the wire (constituting the total gauge length for video multi-extensometry) during stress arrest.
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V. R. Russalian and A. Bhattacharyya "Evolution of phase transformation and reorientation during stress arrest in shape memory alloys", Proc. SPIE 8342, Behavior and Mechanics of Multifunctional Materials and Composites 2012, 83421P (28 March 2012); https://doi.org/10.1117/12.915433
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