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dc.contributor.authorBhatia, V.
dc.contributor.authorKealley, Cat
dc.contributor.authorPrior, M.
dc.contributor.authorCortie, M.
dc.identifier.citationBhatia, V. and Kealley, C. and Prior, M. and Cortie, M. 2011. Martensite destabilization in Au7Cu5Al4 shape-memory alloy. Acta Materialia. 59: pp. 2193-2200.

Aging-induced changes in the austenite peak (AP) temperature of Au7Cu5Al4 shape-memory alloy are investigated. Whereas heat treating the parent phase at temperatures >140 degrees C or aging the martensite for long times at room temperature both stabilized the AP to approximately 80 degrees C, low-temperature excursions into the parent phase caused the subsequent AP to drop to approximately 60 degrees C and the transformation hysteresis to decrease. The evidence indicates that this destabilization of the martensite is caused by time-dependent relaxation of elastic constraint due to parent-phase lath migration during the preceding low-temperature austenitizing treatment. This mechanism of aging is different from that of the better-known symmetry-conforming short-range order phenomenon.

dc.subjectShape-memory alloys
dc.subjectNeutron diffraction
dc.subjectX-ray diffraction
dc.subjectGold alloys
dc.titleMartensite destabilization in Au7Cu5Al4 shape-memory alloy
dc.typeJournal Article
dcterms.source.titleActa Materialia
curtin.accessStatusFulltext not available

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