Characterization of phase transformation during hot compressive deformation in a β-stabilized Ti–45Al–7Nb–0.4W–0.15B alloy
A β-stabilized Ti–45Al–7Nb–0.4W–0.15B (at.%) alloy was hot deformed by uniaxial compression and the phase evolution during the compression was characterized with X-ray diffraction, scanning electron microscopy and electron probe microanalysis. The results show that modest deformation stress during hot compression restrains the γ → α transformation and the decomposition of β phase. The restrained γ → α transformation is a result of a modified equilibrium of the γ and α phases due to the applied stress, and the restrained β decomposition is a kinetic effect due to the decelerated diffusion of β-stabilizing elements caused by the compressive stress. - Highlights: • In β-stabilized TiAl alloys, hot deformation has great influence on the equilibrium of the γ, α, and β phases. • Deformation restrains the γ → α transformation. • Deformation inhibits the decomposition of the β phase.
- OSTI ID:
- 22476116
- Journal Information:
- Materials Characterization, Vol. 105; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALLOY SYSTEMS
ALUMINIUM COMPOUNDS
BORON COMPOUNDS
COMPRESSION
DECOMPOSITION
DEFORMATION
DIFFUSION
ELECTRON MICROPROBE ANALYSIS
INTERMETALLIC COMPOUNDS
NIOBIUM COMPOUNDS
PHASE TRANSFORMATIONS
SCANNING ELECTRON MICROSCOPY
STRESSES
TITANIUM COMPOUNDS
TUNGSTEN COMPOUNDS
X-RAY DIFFRACTION