Metastable phase transformations in Ti-40Al-10V alloy
- Univ. of Surrey, Guildford (United Kingdom). Dept. of Materials Science and Engineering
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 {beta} phase and at room temperature the structure consists of B2, {omega}{sub ordered}, {gamma} and {alpha}{sub 2} phases. The calculated equilibrium phase transformation sequence during cooling is L {yields} L + {beta} {yields} {beta} {yields} {beta} + {alpha} {yields} B2 + {alpha} {yields} {alpha} + B2 + {gamma} {yields} {alpha}{sub 2} + {gamma} + B2. The phase transformation sequence is dramatically changed by rapid quenching from the melt. Athermal ordered {omega} phase is formed in metastable B2 and the {alpha} {yields} {alpha}{sub 2} ordering process is completely suppressed in the melt spun ribbons. The volume fraction of the {alpha} precipitates is also dependent on cooling rates.
- OSTI ID:
- 78319
- Report Number(s):
- CONF-941144--; ISBN 1-55899-265-0
- Country of Publication:
- United States
- Language:
- English
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