Oxide dispersion strengthened mechanically alloyed amorphous Zr-Al-Cu-Ni composites

Particle strengthened Zr sub 65 Al sub 7.5 Cu sub 17.5 Ni sub 10 -based amorphous alloy/ceramic composites were prepared by mechanical alloying. Whereas CeO sub 2 additions suppress an extended supercooled liquid region and increase the crystallization temperature of the amorphous alloy due to at le...

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Bibliographic Details
Published in:Scripta materialia 1998-01, Vol.38 (4), p.595-602
Main Authors: Eckert, J., Seidel, M., Kübler, A., Klement, U., Schultz, L.
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Fibre reinforced metals
Metals. Metallurgy
Powder metallurgy. Composite materials
Production techniques
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Summary:Particle strengthened Zr sub 65 Al sub 7.5 Cu sub 17.5 Ni sub 10 -based amorphous alloy/ceramic composites were prepared by mechanical alloying. Whereas CeO sub 2 additions suppress an extended supercooled liquid region and increase the crystallization temperature of the amorphous alloy due to at least partial dissolution of the oxide, MgO and CaO dispersoids do not affect the tehrmal stability or the viscosity of the glassy matrix and maintain an extended supercooled liquid region. This allows to consolidate these powders into dense bulk specimens. The oxide additions increase the mechanical strength of the material compared to the homogeneous glassy alloy. These results promise to allow the development of a new class of glass-ceramic composites based on multicomponent metallic glasses.
ISSN:1359-6462
1872-8456
DOI:10.1016/S1359-6462(97)00517-4