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Nature of Slip in γ-Titanium Aluminide Above the Yield Stress Anomaly Temperature

Published online by Cambridge University Press:  10 February 2011

S. Jiao ,
N. Bird ,
P. B. Hirsch  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. Hirsch
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

Crystals of γ-TiAl, containing ∼54.5 at% Al, with various orientations were deformed at different temperatures and examined by transmission electron microscopy (TEM). It was found that while in many cases slip and climb of ordinary dislocations tend to predominate, slip by [001] dislocations can be important also. The occurrence of [001] slip has not been reported before. The values of critical resolved shear stress were determined and strong locks on [001] dislocations have been identified as local segments of ½ ⟨112] dislocations arising from interactions between [001] and ½⟨110] dislocations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 552: Symposium KK – High-Temperature Ordered Intermetallic Alloys VIII , 1998 , KK8.12.1
Copyright
Copyright © Materials Research Society 1999

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References

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