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Effect of Strain Rate on the Plastic Behaviour of Ll2 Compounds Based on Ni3Al

Published online by Cambridge University Press:  26 February 2011

Seiji Miura ,
Shouichi Ochiai ,
Yoshihiro Oya ,
Yoshinao Mishima  and
Tomoo Suzuki
Seiji Miura
Affiliation:
Research Laboratory of Precision Machinery and Electronics, Tokyo Institute of Technology, Nagatsuta, Midori-ku, Yokohama 227, Japan (Y. Oya is now with Meisei University, Hodokubo, Hino-shi, Tokyo 191, Japan)
Shouichi Ochiai
Affiliation:
Nagaoka Technological University, Kamitomioka-cho, Nagaoka, Niigata 940-21, Japan
Yoshihiro Oya
Affiliation:
Research Laboratory of Precision Machinery and Electronics, Tokyo Institute of Technology, Nagatsuta, Midori-ku, Yokohama 227, Japan (Y. Oya is now with Meisei University, Hodokubo, Hino-shi, Tokyo 191, Japan)
Yoshinao Mishima
Affiliation:
Research Laboratory of Precision Machinery and Electronics, Tokyo Institute of Technology, Nagatsuta, Midori-ku, Yokohama 227, Japan (Y. Oya is now with Meisei University, Hodokubo, Hino-shi, Tokyo 191, Japan)
Tomoo Suzuki
Affiliation:
Research Laboratory of Precision Machinery and Electronics, Tokyo Institute of Technology, Nagatsuta, Midori-ku, Yokohama 227, Japan (Y. Oya is now with Meisei University, Hodokubo, Hino-shi, Tokyo 191, Japan)
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Abstract

In both single and polycrystalline Ni3Al, no strain rate dependence of 0.2% flow stress is observed in a temperature range where anomalous positive temperature dependence of strength is exhibited. A distinct strain rate dependence is observed, however, in single crystals when the test temperature is raised beyond the peak in flow stress. It is shown that (111) type slip involving diffusional process is responsible for the strain rate sensitivity at near [001] orientation, while (001) type slip which is governed by the Peierls mechanism at orientations away from [001]. In polycrystalline compound with a fine grain size an apparent loss of the positive temperature dependence of strength is observed at a slower strain rate due to grain boundary sliding.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 133: Symposium H – High-Temperature Ordered Intermetallic Alloys III , 1988 , 341
Copyright
Copyright © Materials Research Society 1989

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References

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