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|Title: ||Martensite destabilization in Au7Cu5Al4 shape-memory alloy.|
|Authors: ||Bhatia, VK|
Shape Memory Effect
|Issue Date: ||Mar-2011|
|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.|
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