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Phase transformations in Ti3Al and Ti3Al + Mo aluminides

Published online by Cambridge University Press:  31 January 2011

S. Djanarthany ,
C. Servant  and
R. Penelle
S. Djanarthany
Affiliation:
Laboratoire de Métallurgie Structurale, UA CNRS 1107, Bât. 410–413, Université de Paris Sud, 91405 Orsay Cedex, France
C. Servant
Affiliation:
Laboratoire de Métallurgie Structurale, UA CNRS 1107, Bât. 410–413, Université de Paris Sud, 91405 Orsay Cedex, France
R. Penelle
Affiliation:
Laboratoire de Métallurgie Structurale, UA CNRS 1107, Bât. 410–413, Université de Paris Sud, 91405 Orsay Cedex, France
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Abstract

We have analyzed the phase relationships in two titanium aluminides containing 3.4 at. % Mo with different aluminum compositions. The alloys were first homogenized in the β field, then cooled continuously at different cooling rates from 80 °C/s to 0.1 °C/s. The continuous cooling transformation diagrams (CCT) show that phase transformations and resulting microstructures are highly dependent on cooling rate. The microstructure consists of ordered α2 (DO19), ordered β0 (B2), and athermal ω (hexagonal) phases. The “tweed microstructure” is observed. The evolution of microhardness was determined as well as the relative partitioning of Al and Mo in (α2', α2) and β0 phases as a function of cooling rate.

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Articles
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Journal of Materials Research , Volume 6 , Issue 5 , May 1991 , pp. 969 - 986
Copyright
Copyright © Materials Research Society 1991

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