Structure of Ti–Al–Nb intermetallics produced by mechanical alloying and hot-pressing techniques

Mechanical alloying and hot-pressing consolidation were applied for the manufacturing of γ-TiAl alloys with additions of 5, 10 and 15at.% Nb. The microstructure shows numerous twins within the γ-TiAl phase in the hot-pressed alloys. The grain size (about 0.5μm) is much smaller than in the cast alloy...

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Bibliographic Details
Published in:Materials chemistry and physics 2003-08, Vol.81 (2-3), p.414-416
Main Authors: Dutkiewicz, J., Maziarz, W., Heinrich, H., Kostorz, G.
Format: Article
Language:English
Subjects:
Applied sciences
Condensed matter: structure, mechanical and thermal properties
Electron, ion, and scanning probe microscopy
Exact sciences and technology
Interfacial structure
Local chemical composition
Mechanical alloying
Metal powders
Metals. Metallurgy
Physics
Powder metallurgy. Composite materials
Production techniques
Structure of solids and liquids
crystallography
γ-TiAl intermetallics
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Summary:Mechanical alloying and hot-pressing consolidation were applied for the manufacturing of γ-TiAl alloys with additions of 5, 10 and 15at.% Nb. The microstructure shows numerous twins within the γ-TiAl phase in the hot-pressed alloys. The grain size (about 0.5μm) is much smaller than in the cast alloys. Local chemical analysis indicates that Ti is preferentially replaced by Nb in all phases present. The high-resolution microstructure contains regularly spaced dislocations within the α2/γ interface, resulting from a rotation between the {111}γ and {201}α2 planes by 2.5°.
ISSN:0254-0584
1879-3312
DOI:10.1016/S0254-0584(03)00036-1