Microstructure and mechanical properties of a TiAl-based powder alloy containing carbon

Gas-atomised powder of a Ti–48Al–2Mn–2Nb (at.%) matrix alloy containing 0.8 at.% carbon addition has been examined in the as-solidified and as-HIPped conditions. The as-atomised material consisted of fine powder particles supersaturated in carbon and coarser powder particles containing large carbide...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 1998, Vol.241 (1), p.151-158
Main Authors: Gouma, P.I, Davey, S.J, Loretto, M.H
Format: Article
Language:English
Subjects:
Applied sciences
Carbide precipitation
Exact sciences and technology
Metal powders
Metals. Metallurgy
Powder metallurgy
Powder metallurgy. Composite materials
Production techniques
Properties
TiAl
Titanium aluminides
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Summary:Gas-atomised powder of a Ti–48Al–2Mn–2Nb (at.%) matrix alloy containing 0.8 at.% carbon addition has been examined in the as-solidified and as-HIPped conditions. The as-atomised material consisted of fine powder particles supersaturated in carbon and coarser powder particles containing large carbide platelets. HIPping over the temperature range 1250–1400°C produced fully consolidated structures containing various carbide particles. Mechanical testing of HIPped samples revealed that carbon has a beneficial effect on the strength and creep behaviour, but reduces tensile ductility. The forgeability of the consolidated powder was also examined.
ISSN:0921-5093
1873-4936
DOI:10.1016/S0921-5093(97)00483-8