Thermodynamical model of reversible R-phase transformation in TiNi shape memory alloy

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Abstract

An austenite pre-martensite (R-phase) transformation can be observed in a specially heat treated TiNi alloy. Recent tensile tests performed on Ti-53·3 Ni (wt%) wires exhibited an extremely small hysteresis loop. The uniaxial thermomechanical behaviour of shape memory alloys associated with R-phase transformations is experimentally investigated. An appropriate simple model of an ideal solid undergoing a reversible transformation is developed and applied to predict the uniaxial nonisothermal behaviour of TiNi alloys in the temperature range of R-phase transformations.

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