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Deformation Behavior of Niobium Silicides during High Temperature Compression

Published online by Cambridge University Press:  01 February 2011

Nobuaki Sekido ,
Seiji Miura ,
Yoko Yamabe-Mitarai ,
Yoshisato Kimura  and
Yoshinao Mishima
Nobuaki Sekido
Affiliation:
sekido.nobuaki@nims.go.jp, National Institute for Materials Science, Tsukuba, Japan
Seiji Miura
Affiliation:
miura@eng.hokudai.ac.jp, Hokkaido University, Sapporo, United States
Yoko Yamabe-Mitarai
Affiliation:
MITARAI.Yoko@nims.go.jp, National Institute for Materials Science, Tsukuba, Japan
Yoshisato Kimura
Affiliation:
kimura.y.ac@m.titech.ac.jp, United States
Yoshinao Mishima
Affiliation:
mishima.y.ab@m.titech.ac.jp, Tokyo Institute of Technology, Yokohama, Japan
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Abstract

Deformation behavior of (Nb)/α-Nb5Si3 two-phase alloys is examined by high temperature compression tests. The alloys exhibit brittle fracture behavior at temperatures up to 1473 K, while reasonable compressive deformability at 1673 K. Upon high temperature compression of the alloys, the flow stress gradually decreases after the peak stress due to the recrystallization/recovery in the (Nb) phase, as well as the increase in the density of mobile dislocations within the α-Nb5Si3 phase. Two types of slip systems that operate in α-Nb5Si3 have been identified as {011)<11-1] and {001)<100] in the present study.

Keywords

dislocationstransmission electron microscopy (TEM)Nb

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References

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