The effect of precipitation on the thermo-mechanical properties of Ni-rich near-equiatomic NiTi Shape Memory Alloys (SMAs) is investigated via the finite element method. The thermo-mechanical response is simulated using a Representative Volume Element (RVE), which takes into account the structural effect of the precipitates, as well as the effect of the Ni-concentration gradient in the matrix. The Ni-distribution profile is evaluated using Fick’s law for diffusion. The obtained results reproduce several of the experimentally observed precipitation-induced changes on the transformation behavior characteristics of these materials.

Volume Subject Area:
Mechanics and Behavior of Active Materials
Keywords:
Shape Memory Alloys, Ni-Depletion, Coherent Precipitates, Thermo-mechanical Phase Transformation, Representative Volume Element, Finite Elements
Topics:
Nickel titanium alloys, Thermomechanics
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