ANSTO Publications Online: Martensite destabilization in Au7Cu5Al4 shape-memory alloy.

Please use this identifier to cite or link to this item: http://apo.ansto.gov.au/dspace/handle/10238/3161

Title:	Martensite destabilization in Au7Cu5Al4 shape-memory alloy.
Authors:	Bhatia, VK Kealley, CS Prior, MJ Cortie, MB
Keywords:	Aging X-ray Diffraction Neutron Diffraction Shape Memory Effect Gold Alloys Martensite
Issue Date:	Mar-2011
Publisher:	Elsevier
Citation:	Bhatia, V. K., Kealley, C. S., Prior, M. J., & Cortie, M. B. (2011). Martensite destabilization in Au7Cu5Al4 shape-memory alloy. Acta Materialia, 59(5), 2193-2200.
Abstract:	Aging-induced changes in the austenite peak (Aρ) temperature of Au7Cu5Al4 shape-memory alloy are investigated. Whereas heat treating the parent phase at temperatures >140°C or aging the martensite for long times at room temperature both stabilized the Aρ to ~80°C, low-temperature excursions into the parent phase caused the subsequent Aρ to drop to ~60°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. © 2011, Elsevier Ltd.
URI:	http://dx.doi.org/10.1016/j.actamat.2010.12.021 http://apo.ansto.gov.au/dspace/handle/10238/3161
ISSN:	1359-6454
Appears in Collections:	Journal Articles

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