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The ductility of cast TiAl-based alloys

Published online by Cambridge University Press:  18 January 2011

M H Loretto ,
Z. Wu ,
M Q Chu  and
D Hu
M H Loretto
Affiliation:
IRC in Materials, The University of Birmingham, Edgbaston, B15 2TT, UK
Z. Wu
Affiliation:
IRC in Materials, The University of Birmingham, Edgbaston, B15 2TT, UK
M Q Chu
Affiliation:
IRC in Materials, The University of Birmingham, Edgbaston, B15 2TT, UK
D Hu
Affiliation:
IRC in Materials, The University of Birmingham, Edgbaston, B15 2TT, UK
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Abstract

The factors which influence the ductility of cast samples of TiAl-based alloys are briefly reviewed with emphasis on alloys where microstructural refinement has been used in an attempt to improve ductility. The grain size in cast samples of different TiAl-based alloys can be refined either by high additions of about 1at% boron, or by lower additions of about 0.2at%. In addition it is possible to refine the microstructure by massively transforming samples and heat treating the transformed samples in the (alpha + gamma) phase field to precipitate alpha. Significantly different ductilities are found in different alloys with similar grain sizes or with similar microstructures and the origins of the improvements in ductility and of these differences are discussed in this paper. The role of alloying elements in influencing the degree of order in alpha 2 and in turn influencing slip in alpha 2 is discussed.

Keywords

ductilitygrain sizetransmission electron microscopy (TEM)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1295: Symposium N – Intermetallic-Based Alloys for Structural and Functional Applications , 2011 , mrsf10-1295-n03-01
Copyright
Copyright © Materials Research Society 2011

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References

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