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Plastic Anisotropy of Ti3Al Single Crystals

Published online by Cambridge University Press:  01 January 1992

Y. Umakoshi ,
T. Nakano ,
K. Sumimoto  and
Y. Maeda
Y. Umakoshi
Affiliation:
Department of Materials Science and Engineering, Faculty of Engineering, Osaka University, 2-1, Yamada-Oka, Suita, Osaka 565, Japan
T. Nakano
Affiliation:
Department of Materials Science and Engineering, Faculty of Engineering, Osaka University, 2-1, Yamada-Oka, Suita, Osaka 565, Japan
K. Sumimoto
Affiliation:
Department of Materials Science and Engineering, Faculty of Engineering, Osaka University, 2-1, Yamada-Oka, Suita, Osaka 565, Japan
Y. Maeda
Affiliation:
Department of Materials Science and Engineering, Faculty of Engineering, Osaka University, 2-1, Yamada-Oka, Suita, Osaka 565, Japan
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Abstract

The orientation and temperature dependence of the operative slip systems and critical resolved shear stress (CRSS) were investigated in Ti3Al single crystals containing 24.4at%Al and 33.0at%Al. Prism {1010}<1210> slip occurs preferentially in comparison with basal (0001)<1210> and pyramidal {1121}<1126> slip. The CRSS for prism and basal slip decreases with increasing temperature, while that for pyramidal slip exhibits positive temperature dependence having an anomalous peak around 500°C. The temperature dependence of the CRSS for these slip systems does not strongly depend on Al content. The ductility of Ti3Al single crystals is influenced by operative slip systems. Coarse slip bands on the basal plane often act as a trigger for crack nucleation. The compositional deviation to the Al-rich side is harmful for ductility of Ti3Al alloys.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 441
Copyright
Copyright © Materials Research Society 1995

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References

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