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Effect of Antiphase Domain Boundaries on Prism Slip in Ti3Al Single Crystals

Published online by Cambridge University Press:  11 February 2011

Y. Koizumi ,
Y. Minamino ,
N. Tsuji ,
T. Nakano  and
Y. Umakoshi
Y. Koizumi*
Affiliation:
Department of Adaptive Machine Systems, Osaka University, 2–1 Yamada-oka, Suita, Osaka 565–0871, Japan
Y. Minamino
Affiliation:
Department of Adaptive Machine Systems, Osaka University, 2–1 Yamada-oka, Suita, Osaka 565–0871, Japan
N. Tsuji
Affiliation:
Department of Adaptive Machine Systems, Osaka University, 2–1 Yamada-oka, Suita, Osaka 565–0871, Japan
T. Nakano
Affiliation:
Department of Materials Science and Engineering, Osaka University, 2–1 Yamada-oka, Suita, Osaka 565–0871, Japan
Y. Umakoshi
Affiliation:
Department of Materials Science and Engineering, Osaka University, 2–1 Yamada-oka, Suita, Osaka 565–0871, Japan
*
* Corresponding author. tel&fax: +81–6–6879–7434. E-mail address:koizumi@ams.eng.osaka-u.ac.jp (Y. Koizumi)
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Abstract

Effect of antiphase domain boundaries (APDBs) on yielding and dislocation structure were investigated in Ti3Al single crystals oriented for prism slip. The yield stress greatly depended on the size of antiphase domains (APDs). The yield stress of Ti3Al with the average APD size of 35nm was about six times higher than that of Ti3Al without APDB. Single dislocations (isolated superpartial dislocations) were observed in the deformed Ti3Al single crystal with APD sizes smaller than 100nm, while superdislocation pairs were observed in those with larger APDs. The mechanism of the interaction between the prism dislocations and APDBs is discussed.

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References

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