Phase Field Modeling of Martensitic Phase Transformation of Nitinol

Eric Rivera, Mahmood Mamivand

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Abstract

Nitinol (NiTi), a near equiatomic alloy of nickel and titanium, is the most broadly known and used shape memory alloy. Shape memory characteristics result from the transformation phenomena between the austenite and martensite phases, and to the fact that in this alloy martensite accommodates deformation by twinning. A two-dimensional phase-field model is developed to study the cubic to monoclinic martensitic phase transformation in Nitinol. Simulations are conducted in temperature and deformation regimes in which the alloy evinces the shape memory effect. A Landau theory approach for proper temperature-induced martensitic phase transformations is implemented. The phase-field method presented in this work is generally applicable to simulate the dynamic microstructure evolution of distinct shape memory alloys.

Original languageAmerican English
StatePublished - 12 Jul 2018

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