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Plastic Behavior and Deformation Structure of Silicide Single Crystals with Transition Metals at High Temperatures

Published online by Cambridge University Press:  25 February 2011

Y. Umakoshi ,
T. Nakashima ,
T. Nakano  and
E. Yanagisawa
Y. Umakoshi
Affiliation:
Department of Materials Science and Engineering, Faculty of Engineering, Osaka University, 2–1, Yamada–oka, Suita, Osaka 565, Japan
T. Nakashima
Affiliation:
Sumitomo Metal Industries, ULd., Wakayama, Japan
T. Nakano
Affiliation:
Department of Materials Science and Engineering, Faculty of Engineering, Osaka University, 2–1, Yamada–oka, Suita, Osaka 565, Japan
E. Yanagisawa
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 mechanical and plastic behaviors of refractory silicide single crystals with Cllb (MoSi2), C40 (CrSi2, TaSi2 and NbSi2), D88 (Ti5Si3) and Cl (CoSi2 and (Co0.9Ni0.1)Si2) structures were investigated. The C40–type silicides were deformed by (0001)<1120> slip. Their yield stress decreased sharply with increasing temperature but NbSi2 and TaSi2 which were deformable even at low temperatures, exhibited anomalous strengthening around 1350°C. Deformation of Ti5Si3 whose ductile-brittle transition occurred around 1300°C was controlled by twins and the brittle fracture occurred on the basal plane. In CoSi2 the {001}<100> slip was only activated at ambient temperatures but addition of Ni activated {110}<110> slip as secondary slip system and improved the ductility. The creep behavior of MoSi2 and CrSi2 single crystals were also investigated and was found to be controlled by the viscous and glide motion of dislocations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 322: Symposium F – High-Temperature Silicides and Refractory Alloys , 1993 , 9
Copyright
Copyright © Materials Research Society 1994

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