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Deformation Mechanisms in The Intermetallic Compound MoSi2

Published online by Cambridge University Press:  01 January 1992

D.J. Evans ,
S.A. Court ,
P.M. Hazzledine  and
H.L. Fraser
D.J. Evans
Affiliation:
Department of Materials Science and Engineering, The Ohio State University, 2041 College Road Columbus, OH, 43210 Wright Laboratory, Materials Directorate, Wright-Patterson AFB, Ohio, 45433
S.A. Court
Affiliation:
Alcan Banbury Laboratories, Banbury, United Kingdom
P.M. Hazzledine
Affiliation:
UES, Inc., 4401 Dayton - Xenia Road, Dayton, Ohio 45432
H.L. Fraser
Affiliation:
Department of Materials Science and Engineering, The Ohio State University, 2041 College Road Columbus, OH, 43210
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Abstract

The nature of dislocations which have been activated during plastic deformation of MoSi2 at 1400°C in compression have been identified using transmission electron microscopy. Particular attention has been paid to the possible dissociation of dislocations, and it has been confirmed that dislocations with Burgers vectors lying parallel to <111> are dissociated. The dissociation is represented by:

1/2<111> → 1/4<111> + SISF + 1/4<111>,

where SISF stands for superlattice intrinsic stacking fault. The SISF energy has been estimated from the separation of the partial dislocations to be ≈ 255 mJ.m−2. A simple explanation to account for the occurrence of dissociation for particular dislocations is presented.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 567
Copyright
Copyright © Materials Research Society 1995

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References

REFERENCES

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