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Martensite destabilization in Au7Cu5Al4 shape-memory alloy

✍ Scribed by V.K. Bhatia; C.S. Kealley; M.J. Prior; M.B. Cortie

Publisher
Elsevier Science
Year
2011
Tongue
English
Weight
810 KB
Volume
59
Category
Article
ISSN
1359-6454

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✦ Synopsis

Aging-induced changes in the austenite peak (A P ) temperature of Au 7 Cu 5 Al 4 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 A P to $80 °C, low-temperature excursions into the parent phase caused the subsequent A P 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.

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