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Crystal Structure, Phase Stability and Plastic Deformation Behavior of Ti-rich Ni3(Ti, Nb) Single Crystals with Various Long-Period Ordered Structures.

Published online by Cambridge University Press:  26 February 2011

Koji Hagihara ,
Tetsunori Tanaka ,
Takayoshi Nakano  and
Yukichi Umakoshi
Koji Hagihara
Affiliation:
Department of Materials Science and Engineering & Handai Frontier Research Center, Graduate School of Engineering, Osaka University, 2–1, Yamada-oka, Suita, Osaka 565–0871, Japan
Tetsunori Tanaka
Affiliation:
Department of Materials Science and Engineering & Handai Frontier Research Center, Graduate School of Engineering, Osaka University, 2–1, Yamada-oka, Suita, Osaka 565–0871, Japan
Takayoshi Nakano
Affiliation:
Department of Materials Science and Engineering & Handai Frontier Research Center, Graduate School of Engineering, Osaka University, 2–1, Yamada-oka, Suita, Osaka 565–0871, Japan
Yukichi Umakoshi
Affiliation:
Department of Materials Science and Engineering & Handai Frontier Research Center, Graduate School of Engineering, Osaka University, 2–1, Yamada-oka, Suita, Osaka 565–0871, Japan
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Abstract

In Ni-Ti-Nb ternary system, there are some geometrically close-packed (GCP) phases with long-period stacking sequences of a close-packed plane (CPP). Among them, our focus is on the Ni3(Ti0.90Nb0.10) crystals with Pb3Ba-type rhombohedral structure with nine-fold stacking sequence. Compression tests were conducted using the single crystals and the temperature and orientation dependences of plastic deformation behavior were investigated in comparison with those of D024-Ni3Ti crystals with the four-fold stacking sequence. The K-W locking of screw dislocation was found to occur not only in the compounds such as Ni3Al and Ni3Ti with a relatively small unit cell, but also even in complex compounds with longer-period stacking structures by slip on the common CPP in the GCP structures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 842: Symposium S – Integrative and Interdisciplinary Aspects of Intermetallics , 2004 , S5.26
Copyright
Copyright © Materials Research Society 2005

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References

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