Aging Enhanced Super-Elasticity and Ductility of a Cold NiTiTa Alloy

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Original languageEnglish
Journal / PublicationMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Online published15 Jun 2022
Publication statusOnline published - 15 Jun 2022

Abstract

A cold NiTiTa alloy was found to be very brittle in the fully annealed condition due to its high-austenite stability, which suppressed stress-induced-martensite transformation and dislocation slip. However, ductility and super-elasticity are largely improved by formation of Ti3Ni4 and Ti2Ni3 precipitates upon aging at lower temperatures. Cold work promotes Ti2Ni3 precipitation during aging. Compared to the as-drawn material, the fully annealed material shows higher strain recovery and elongation after aging for a short amount of time.