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Yield Stress Anomaly for 1/2〈112] {1111} Slip in y-Titanium Aluminide

Published online by Cambridge University Press:  10 February 2011

S. Jiao ,
N. Bird ,
P. B.  and
G. Taylor
S. Jiao
Affiliation:
University of Oxford, Department of Materials, Parks Road, Oxford, OXI 3PH, UK
N. Bird
Affiliation:
University of Oxford, Department of Materials, Parks Road, Oxford, OXI 3PH, UK
P. B.
Affiliation:
University of Oxford, Department of Materials, Parks Road, Oxford, OXI 3PH, UK
G. Taylor
Affiliation:
University of Oxford, Department of Materials, Parks Road, Oxford, OXI 3PH, UK
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Abstract

Transmission electron microscopy (TEM) studies of dislocation structures in single crystals of TiAl containing 54.5 or 54.7 at% Al deformed at different temperatures revealed the occurrence of slip on ½〈112]{ {111} at room temperature and near the peak of the yield stress anomaly (YSA). Measurements of the corresponding yield stresses revealed the existence of a YSA for this type of slip. Weak-beam TEM showed the presence of locks at room temperature for 30° dislocations and at high temperatures for edge dislocations. Both types of locks involve dissociation on two intersecting { 1111} type planes, driven by reduction in elastic strain energy. The edge dislocation dissociation at high temperatures involves both climb and glide.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 552: Symposium KK – High-Temperature Ordered Intermetallic Alloys VIII , 1998 , KK1.9.1
Copyright
Copyright © Materials Research Society 1999

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References

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