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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...
Surface oxidation at elevated temperatures has been a phenomenon of interest for NiTi alloys. On one hand it has been deliberately used to provide a surface protective layer to prevent Ni release for biomedical applications, and on the other it is to be minimised in metal processing and production. This study investigated the use of flowing argon as a protective gas for heat treating NiTi at elevated...
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