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Atomic Structure of Internal Interfaces in A Ti3AI-TiAI Two-Phase Alloy

Published online by Cambridge University Press:  25 February 2011

J. M. Penisson ,
R. Bonnet ,
M. Loubradou  and
C. Derder
J. M. Penisson
Affiliation:
Ddpartement de Recherche Fondamentale sur la Matiére Condensde, CENG, 85X, 38041, Grenoble Cedex, France.
R. Bonnet
Affiliation:
INPG, LTPCM(URA no 29)/ENSEEG, Domaine Universitaire, BP 75, 38402, Saint Martin-d'Hores, France.
M. Loubradou
Affiliation:
INPG, LTPCM(URA no 29)/ENSEEG, Domaine Universitaire, BP 75, 38402, Saint Martin-d'Hores, France.
C. Derder
Affiliation:
INPG, LTPCM(URA no 29)/ENSEEG, Domaine Universitaire, BP 75, 38402, Saint Martin-d'Hores, France.
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Abstract

TiAI/Ti3AI colonies in an as-cast Ti-40 at.%AI alloy have been studied using HREM. Their microstructures consist mainly of alternating parallel lamellae of y (TiAI, L10) and α2 (Ti3AI, DO19) phases. The γ phase is often twinned with extended boundaries {111] parallel to the adjacent Ti3AI-TiAI interphase boundaries. The detailed atomic structures of the two possible (111)-γ σ3a and (111)γ σ3b twin boundaries have been observed as well as the facetted (0001)α2//(11)γ interphase boundaries. The facetted boundaries contain transformation dislocations whose elastic displacement fields conform well to the fields computed from the Somigliana dislocation model.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 238: Symposium Cb – Structure and Properties of Interfaces in Materials , 1991 , 41
Copyright
Copyright © Materials Research Society 1992

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References

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