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Shape memory behavior of Ti–Ta and its potential as a high-temperature shape memory alloy

✍ Scribed by Pio John S. Buenconsejo; Hee Young Kim; Hideki Hosoda; Shuichi Miyazaki

Publisher
Elsevier Science
Year
2009
Tongue
English
Weight
788 KB
Volume
57
Category
Article
ISSN
1359-6454

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✦ Synopsis

In this study, the effect of Ta content on shape memory behavior of Ti-Ta alloys was investigated. The shape memory effect was confirmed in Ti-(30-40)Ta alloys. The martensitic transformation start temperature (M s ) decreased by 30 K per 1 at.% Ta. The amount of x phase formed during aging decreased with increasing Ta. A stable high-temperature shape memory effect was confirmed for Ti-32Ta (M s = 440 K) during thermal cycling between 173 and 513 K. On the other hand, the high-temperature shape memory effect of Ti-22Nb, which has a similar M s to Ti-32Ta, exhibited poor stability due to the large amount of x phase formed during thermal cycling. It is suggested that Ti-Ta is an attractive candidate for the development of novel high-temperature shape memory alloys.

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