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Hot Deformation Behavior and Microstructure Evolution of a DC Cast Hypereutectic Al-Si Alloy

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Abstract:

The hot deformation behavior and microstructure evolution of a DC cast hypereutectic Al-Si alloy was studied in the temperature range of 400-500 °C and strain rate range of 0.001-1 s-1. The results show that the as-cast microstructure of the alloy consists of polygonal primary Si particles and α-aluminum dendritic halos with Al-Si eutectics and intermetallic compounds segregated into the interdendritic regions. The flow stress of the alloy is a strong function of temperature and strain rate, and the peak stress is increased with the decrease of deformation temperature and the increase of strain rate. All the true stress-true stain curves in the experiments exhibit dynamic softening. The fracture frequency of primary Si particle is decreased with the increase of deformation temperature and the decrease of strain rate. The dynamic flow softening is mainly as a result of dynamic recrystallization.

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Periodical:

Applied Mechanics and Materials (Volume 151)

Pages:

332-336

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.151.332

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Online since:

January 2012

Authors:

Ke Zhun He, Fu Xiao Yu, Da Zhi Zhao, Liang Zuo

Keywords:

Al-Si Alloy, Hot Deformation, Microstructure, Primary Silicon

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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