Abstract
Shape memory alloys (SMAs) are commonly used for various applications, e.g. aerospace, automotive, telecommunication and biomedical. Although Ni–Ti SMAs are commercialized, however due to the possibility of hypersensitivity of Ni, Ti–Nb based SMAs have been developed and investigated as potential replacement of Ni–Ti alloys in biomedical applications. In this study, Ti–Nb–Al alloys were fabricated with varying amount of Al to investigate its effect on the microstructure and superelasticity of the alloys. The XRD analysis confirmed that the alloys had austenitic phase (β) at room temperature, which is essential to demonstrate superelastic behaviour. It was observed that Al additions refined the grain size, decreased the transformation temperature and improved the mechanical behaviour. These alloys exhibited strain recovery up to 4.7%.
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