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2 April 2008 Low-cycle superelastic response of a titanium-niobium shape memory alloy
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Cyclic and time dependence of superelastic properties such as critical stress for stress-induced martensite (σSIM), irrecoverable strain levels, and stress hysteresis are crucial parameters to ensure stable operation in applications of shape memory alloys. In our studies on titanium-niobium shape memory alloys that have undergone various thermo-mechanical processes, declines in both σSIM and stress hysteresis with increasing cycle number were observed. More surprisingly, aging treatment at room temperature following cycling produced stress-strain behavior very similar to behavior of samples prior to cyclic deformation, and irrecoverable strain levels did not increase monotonically with increasing cycle number. Lowest irrecoverable strain levels and smallest evolution in the superelastic behavior were found in precipitated cold rolled or processed specimen by equal channel angular extrusion.
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Ji Ma, Ibrahim Karaman, and Hans J. Maier "Low-cycle superelastic response of a titanium-niobium shape memory alloy", Proc. SPIE 6929, Behavior and Mechanics of Multifunctional and Composite Materials 2008, 692914 (2 April 2008);

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