Additional Funding Sources
The project described was supported by the Research Experience for Undergraduates Program Site: Materials for Society at Boise State University under Award No. 1658076.
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.
Phase Field Modeling of Martensitic Phase Transformation of Nitinol
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.
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