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Effect of stress state on the stress-induced martensitic transformation in polycrystalline Ni-Ti alloy

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Abstract

The effect of stress state on the character and extent of the stress-induced martensitic transformation in polycrystalline Ni-Ti shape memory alloy has been investigated. Utilizing unique experimental equipment, uniaxial and triaxial stress states have been imposed on Ni-Ti specimens and the pseudoelastic transformation strains have been monitored. Comparisons between tests of differing stress states have been performed using effective stress and effective strain quantities; a strain offset method has been utilized to determine the effective stress required for transformation under a given stress state. Results of the tests under different stress states indicate that (1) despite the negative volumetric strain associated with the austenite-to-martensite transformation in Ni-Ti, effective stress for the onset of transformation decreases with increasing hydrostatic stress; (2) effective stressvs effective strain behavior differs greatly under different applied stress states; and (3) austenite in Ni-Ti is fully stable under large values of compressive hydrostatic stress.

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Jacobus, K., Sehitoglu, H. & Balzer, M. Effect of stress state on the stress-induced martensitic transformation in polycrystalline Ni-Ti alloy. Metall Mater Trans A 27, 3066–3073 (1996). https://doi.org/10.1007/BF02663855

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