Abstract
Martensitic phase of NiTi shape memory alloys has been shown to exhibit anisotropic coefficients of thermal expansion (CTEs) after severe plastic deformation; however, the evolution of this anisotropy has not been examined as a function of deformation. Here, equiatomic NiTi was incrementally rolled down to 30% thickness reduction and the evolution of CTEs was measured. NiTi samples exhibited maximum CTE anisotropy after only 5% rolling reduction with a range of -10 to 27 ppmK−1, as a result of rapid crystallographic texture evolution. Due to martensite stabilization, the CTE anisotropy persisted up to 125°C with CTE magnitude being enhanced by reverse transformation.
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