Study of phase transformations in Ti-47Al-3V

Conference · Sat Dec 30 23:00:00 EST 1995

OSTI ID:225088

Shao, G; Tsakiropoulos, P; Miodownik, A P ^[1]

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1. Univ. of Surrey, Guildford (United Kingdom). Dept. of Materials Science and Engineering

Microstructures of slowly cooled ingots and melt spun Ti-47Al-3V ribbons have been investigated. In the slowly cooled ingot, {beta} was the high temperature primary phase in equilibrium with the melt during solidification and at room temperature the microstructure consisted of lamellar {alpha}{sub 2} + {gamma} structure and interdendritic {gamma} segregate. Rapid solidification changed the phase transformation sequence in the alloy dramatically, leading to complete {gamma} phase formation at the wheel side of the ribbons. These {gamma} grains generally contained plenty of stacking faults and thermal APBs. The metastable phase transformation sequence in the melt spun ribbons is consistent with L{r_arrow}L+{alpha}{r_arrow}{alpha}, followed by an {alpha}{r_arrow}{gamma}{sub m} massive transformation. The thermal APBs in the {gamma} grains are attributed to a disorder/order transition in the {gamma} phase.

• OSTI ID: 225088
• Report Number(s): CONF-950201--; ISBN 0-87339-304-X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CASTING
INTERMETALLIC COMPOUNDS
LAMELLAE
MELTING
MICROSTRUCTURE
NUCLEATION
ORDER-DISORDER TRANSFORMATIONS
PHASE DIAGRAMS
PHASE TRANSFORMATIONS
SAMPLE PREPARATION
SCANNING ELECTRON MICROSCOPY
SOLIDIFICATION
TITANIUM ALLOYS
TRANSMISSION ELECTRON MICROSCOPY
VANADIUM ALLOYS