The role of austenitic symmetric tilt grain boundaries (STGBs) on the martensitic transformation in NiTi alloy during thermal cycling between 500K and 10K are studied from molecular dynamics simulations. Four austenitic STGBs including Σ3[11¯0](111), Σ3[11¯0](112), Σ9[11¯0](114) and Σ9[11¯0](221) have been considered. Through martensitic transformation, the austenitic STGBs transform to martensitic grain boundaries (GBs) and martensitic twin boundaries form in the interior of the simulation models. After austenitic transformation, the martensitic GBs recover to the austenitic STGBs and the twin boundaries disappear. We find that the roles of STGBs on the martensitic transformation can be divided into three groups based on the martensite start temperature (Ms). (1) The Σ3[11¯0](112) and Σ9[11¯0](221) STGBs retard the martensitic transformation, i.e., decreases Ms, by raising the potential energy of the grain interior. (2) The Σ9[11¯0](114) STGB promotes the martensitic transformation by lowering the potential energy of the grain interior. (3) The effects of the Σ3[11¯0](111) STGB depend on whether twins form during cooling. The evolutions of the microstructures during thermal loadings are analyzed using the von Mise shear strain; insight obtained in this work paves the way for engineering NiTi shape memory alloy through grain boundaries.
Materials & design – Elsevier
Published: Jan 5, 2018
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