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Metastable Phase Transformations in Ti-40Al-10V Alloy

Published online by Cambridge University Press:  22 February 2011

G. Shao ,
P. Tsakiropoulos  and
A. P. Miodownik
G. Shao
Affiliation:
Department of Materials Science and Engineering University of Surrey, Guildford, Surrey GU2 5XH, UK
P. Tsakiropoulos
Affiliation:
Department of Materials Science and Engineering University of Surrey, Guildford, Surrey GU2 5XH, UK
A. P. Miodownik
Affiliation:
Department of Materials Science and Engineering University of Surrey, Guildford, Surrey GU2 5XH, UK
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Abstract

The microstructures in arc melted ingots and melt spun ribbons have been investigated by electron microscopy and thermodynamic modelling has been used to study the phase transformations. In the ingot, solidification starts with the bcc β phase and at room temperature the structure consists of B2, ωordered, γ and α2 phases. The calculated equilibrium phase transformation sequence during cooling is L → L+ β→β→β + α→β2+α → α+β2+γ → α2+γ + B2. The phase transformation sequence is dramatically changed by rapid quenching from the melt. Athermal ordered w phase is formed in metastable B2 and the α→α2 ordering process is completely suppressed in the melt spun ribbons. The volume fraction of the α precipitates is also dependent on cooling rates.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 364: Symposium L – High-Temperature Ordered Intermetallic Alloys–VI , 1994 , 187
Copyright
Copyright © Materials Research Society 1995

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