Effect of Low Temperature Ageing on the Transformation Behaviour of Near-Equiatomic NiTi

Y. Liu, Yinong Liu, X. Chen, X. Chen, Paul Mccormick

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

A unique three-stage transformation behaviour on cooling has been observed in a Ti-50.2 at % Ni alloy after a low temperature ageing treatment. The cooling transformation in the aged alloy occurred as a three-stage process of austenite-to-R phase transition followed by two separate martensitic transformations. The R phase transition developed during ageing with a clear second order nature initially and gradually evolved into a predominantly first order process. The occurrence of the R transition is not associated with a decrease in the martensitic transformation temperature during ageing. The reverse transformation to austenite occurred in one step, regardless of the nature of the forward transformation on cooling. An all-round shape memory effect was observed in aged samples. These experimental observations suggest that precipitation induced by the ageing treatment is responsible for the unusual transformation behaviour.
Original languageEnglish
Pages (from-to)5979
JournalJournal of Materials Science
Volume32
DOIs
Publication statusPublished - 1997

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