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Surface Energies of Planar Defects and Dislocation Processes in Al3Ti and Tial

Published online by Cambridge University Press:  26 February 2011

G. Hug ,
J. Douin  and
P. Veyssiere
G. Hug
Affiliation:
Lem Onera-CNRS, BP 72, 92322 Châtillon Cedex, France.
J. Douin
Affiliation:
Lem Onera-CNRS, BP 72, 92322 Châtillon Cedex, France.
P. Veyssiere
Affiliation:
Lem Onera-CNRS, BP 72, 92322 Châtillon Cedex, France.
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Abstract

Information on APB energy in ordered alloys is important not only to understand their mechanical properties but also to analyse conditions for phase transformation. APB surface energies are determined from dissociation distances of superdislocations both in TiAl and Al3Ti Medium and high APB energy anisotropies are found in TiAl and Al3Ti respectively. These results are consistent with phase diagram studies which predict that the APB energy vanishes in the (001) plane near the Al3Ti composition. Examples of decompositions of perfect dislocations into perfect dislocations are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 133: Symposium H – High-Temperature Ordered Intermetallic Alloys III , 1988 , 125
Copyright
Copyright © Materials Research Society 1989

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References

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