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Temperature Dependence of Yield Stress and Dislocation Dissociation in L12-Ordered Intermetallic Compounds

Published online by Cambridge University Press:  10 March 2011

Haruyuki Inui  and
Norihiko L. Okamoto
Haruyuki Inui
Affiliation:
Department of Materials Science and Engineering, Kyoto University Sakyo-ku, Kyoto 606-8501, Japan
Norihiko L. Okamoto
Affiliation:
Department of Materials Science and Engineering, Kyoto University Sakyo-ku, Kyoto 606-8501, Japan
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Abstract

The temperature dependence of yield stress and the associated dislocation dissociation in L12 intermetallic compounds are investigated in order to check the feasibility of the classification of L12 intermetallic compounds so far reported in terms of the planarity of core structures of partial dislocations with b = 1/2<110> and 1/3<112> on {111} and {001} glide planes. In contrast to what is believed from the reported classification, the motion of APB-coupled dislocations is proved to give rise to the rapid decrease in yield stress at low temperatures for Co3Ti and Co3 (Al,W). The temperature dependence of yield stress at low temperatures is newly interpreted in terms of a thermal component of solid-solution hardening, at least, for these two L12 compounds. We have proposed a new way to describe the yield stress–temperature curves of L12 compounds with three parameters (the athermal and thermal components of solid-solution hardening and the anomalous strengthening component) when the dislocation dissociation scheme is of the APB-type.

Keywords

dislocationstransmission electron microscopy (TEM)strength
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1295: Symposium N – Intermetallic-Based Alloys for Structural and Functional Applications , 2011 , mrsf10-1295-n08-01
Copyright
Copyright © Materials Research Society 2011

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References

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