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TEM characterisation of fatigue tested lamellar Ti-44Al-8Nb-1B

Published online by Cambridge University Press:  26 February 2011

H Jiang ,
D Hu  and
I P Jones
H Jiang
Affiliation:
Department of Metallurgy and Materials, The University of Birmingham, Edgbaston, B15 2TT, UK
D Hu
Affiliation:
IRC in Materials, The University of Birmingham, Edgbaston, B15 2TT, UK
I P Jones
Affiliation:
Department of Metallurgy and Materials, The University of Birmingham, Edgbaston, B15 2TT, UK
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Abstract

Detailed microstructural examination by TEM of fine-grained polycrystalline lamellar Ti-44Al-8Nb-1B after fatigue testing (R=0.1) at room temperature has been carried out. The operative slip systems were identified as 1/2<110> ordinary dislocations and 1/6<112> twinning. The results showed no strong relation between operative slip systems and macroscopic Schmid factor and it is believed the local stress conditions control the operation of the slip systems. Translamellar cracking was observed to be associated with fine transverse twins in the gamma lamellae.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 842: Symposium S – Integrative and Interdisciplinary Aspects of Intermetallics , 2004 , S7.2
Copyright
Copyright © Materials Research Society 2005

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References

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