Precipitation of Si particles in a super-rapidly solidified Al–Si hypereutectic alloy

Fine silicon particles of approximately 20nm in average diameter were dispersed in the Al matrix of a hypereutectic Al–Si alloy powder produced by the spinning water atomization process. This powder was sintered at a temperature between 623 and 773K for a maximum period of time of 20.4ks. The silico...

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Bibliographic Details
Published in:Materials chemistry and physics 2003-08, Vol.81 (2-3), p.393-395
Main Authors: Matsuura, K., Kudoh, M., Kinoshita, H., Takahashi, H.
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Electron, ion, and scanning probe microscopy
Exact sciences and technology
Physics
Powder metallurgy
Precipitation hardening
Structure of solids and liquids
crystallography
Tensile strength
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Summary:Fine silicon particles of approximately 20nm in average diameter were dispersed in the Al matrix of a hypereutectic Al–Si alloy powder produced by the spinning water atomization process. This powder was sintered at a temperature between 623 and 773K for a maximum period of time of 20.4ks. The silicon particles grew during sintering but the size remained at a sub-micron level. The Vickers hardness varied from 150 and 180, depending on the sintering temperature. These values of the Vickers hardness were two to three times as high as those of conventionally cast bars of the same alloy.
ISSN:0254-0584
1879-3312
DOI:10.1016/S0254-0584(03)00030-0