Influence of Elastic Energy on the Unloading Behaviour of Niti Shape Memory Alloys

Yinong Liu, D. Favier, L. Orgeas

    Research output: Contribution to journalArticle

    Abstract

    A non-linear unloading path of deformed NiTi shape memory alloys was observed during mechanical testing at various temperatures, giving a strain recovery larger than what expected from elasticity. Whilst the nonlinear unloading path at above the A(S) temperature may be rationalised by a simultaneous reverse transformation from the oriented martensite to austenite, the non-linear strain recovery during unloading at below the A(S) temperature must have a different mechanism, because the thermodynamic driving force for a reverse transformation is negative. This second mechanism is ascribed to a 'self-deorientation' process of the fully oriented martensite and the driving force for this process is attributed to the elastic energy stored in the matrix during the forward deformation process.
    Original languageEnglish
    Pages (from-to)593-598
    JournalJournal de Physique IV
    Volume5
    DOIs
    Publication statusPublished - 1995

    Fingerprint Dive into the research topics of 'Influence of Elastic Energy on the Unloading Behaviour of Niti Shape Memory Alloys'. Together they form a unique fingerprint.

    Cite this