Thermal stability of nanostructured titanium aluminides

Blended elemental Ti-24at.%Al-11at.%Nb and Ti-55at.%Al powders were mechanically alloyed to a B2/bcc and an amorphous phase, respectively. The grain size of the B2/bcc was about 20 nm. Hot isostatic pressing of these powders at 975°C resulted in fully dense compacts, and the Ti-24at.%Al-11at.%Nb tra...

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Bibliographic Details
Published in:Nanostructured materials 1993, Vol.2 (5), p.527-535
Main Authors: Suryanarayana, C., Korth, G.E., Chen, G.-H., Frefer, A., Froes, F.H.
Format: Article
Language:English
Subjects:
Applied sciences
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Materials synthesis
materials processing
Metal powders
Metals. Metallurgy
Physics
Powder metallurgy. Composite materials
Production techniques
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Summary:Blended elemental Ti-24at.%Al-11at.%Nb and Ti-55at.%Al powders were mechanically alloyed to a B2/bcc and an amorphous phase, respectively. The grain size of the B2/bcc was about 20 nm. Hot isostatic pressing of these powders at 975°C resulted in fully dense compacts, and the Ti-24at.%Al-11at.%Nb transformed to a mixture of B2/bcc and orthorhombic phases while the Ti-55at.%Al fully crystallized into a mixture of the Ti 3Al and TiAl phases. The HIP ed compacts had an average grain size of approximately 125 nm for the B2/bcc phase and 260 nm for the orthorhombic phase in Ti-24at%Al-11at%Nb, and 85 nm for the TiAl phase and 220 nm for the Ti 3Al phase in the Ti-55at%Al. This work demonstrates that near-nanostructured size grains are preserved in these alloys even after processing at a relatively high temperature.
ISSN:0965-9773
1872-9150
DOI:10.1016/0965-9773(93)90170-G