Metastable phase formation during {alpha}{sub 2}(D0{sub 19}) to {gamma}(L1{sub 0}) transformation in as-atomized {gamma}-TiAl alloy powders

Journal Article · Mon Nov 22 00:00:00 EST 2004 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.1825065· OSTI ID:20634452

Karadge, M; Gouma, P I ^[1]

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1. Department of Materials Science and Engineering, State University of New York, Stony Brook, New York 11794-2275 (United States)

{alpha}{sub 2}(D0{sub 19}) to {gamma}(L1{sub 0}) transformation during heating of as-atomized {gamma}-TiAl powder was investigated by differential scanning calorimetry and x-ray diffraction. The as-atomized coarse powder particles ({gamma}-TiAl powder: Ti-45Al-2Nb-0.7Mo-0.1W-2Cr-0.27O-0.2Si) with large amounts of retained {alpha}{sub 2} are a perfect candidate to investigate this transformation. It was observed that {alpha}{sub 2} to {gamma} transformation is a two-step process involving the formation of a disordered face-centered-cubic {gamma}{sup '}TiAl [with a({gamma}{sup '})=c({gamma})] as an intermediate phase followed by ordering.

• OSTI ID: 20634452
• Journal Information: Applied Physics Letters, Vol. 85, Issue 21; Other Information: DOI: 10.1063/1.1825065; (c) 2004 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
ANNEALING
BINARY ALLOY SYSTEMS
CALORIMETRY
CHROMIUM ALLOYS
FCC LATTICES
GRAIN SIZE
MICROHARDNESS
NIOBIUM ALLOYS
ORDER-DISORDER TRANSFORMATIONS
PARTICLES
POWDERS
THIN FILMS
TITANIUM ALLOYS
X-RAY DIFFRACTION