Characterization of phase transformation during hot compressive deformation in a β-stabilized Ti–45Al–7Nb–0.4W–0.15B alloy

Journal Article · Wed Jul 15 00:00:00 EDT 2015 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2015.05.008· OSTI ID:22476116

Liu, Bin; Liu, Yong; Huang, Lan; Li, Huizhong; He, Yuehui

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

Related Subjects

36 MATERIALS SCIENCE
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