Microstructure and Property of Rapid-Solidified Al-Si Alloys by Solution Treatment

Ai Qin Wang; Jing Pei Xie; Wen Yan Wang; Ji Wen Li; Luo Li Li

doi:10.4028/www.scientific.net/AMR.139-141.243

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 139-141Microstructure and Property of Rapid-Solidified...

Microstructure and Property of Rapid-Solidified Al-Si Alloys by Solution Treatment

Abstract:

A rapid-solidified hypereutectic Al-21Si-0.8Mg-1.5Cu-0.5Mn alloys strips has been prepared by single roller melt-spinning. The effects of solution technology on the microstructures and properties of the strips have been investigated by SEM, TEM. The results showed that the nucleation and growth of primary silicon are suppressed and α-Al is nucleated which prior to eutectic. The Cu, Mg and Mn are all supersaturated solution in α-Al. The major part of Si solution in α-Al, and the rest are precipitated by the micro-nanocrystals eutectic silicon. The metastable microstructures of micro-nanocrystals hypoeutectic are formed. And in the solution process, Si are precipitated from the matrix and gradually aggregate up to form small particles distributing in the matrix with the heating time. At 480°C for 100 minutes followed by quenching in water and a natural aging for 96h, the finer and more roundness of silicon particle and the maximum Vickers hardness are formed.

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Periodical:

Advanced Materials Research (Volumes 139-141)

Pages:

243-246

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.139-141.243

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Online since:

October 2010

Authors:

Ai Qin Wang, Jing Pei Xie, Wen Yan Wang, Ji Wen Li, Luo Li Li

Keywords:

Microhardness, Microstructure, Rapid Solidification, Solution Treatment, Sypereutectic Al-Si Alloy

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