Microstructures and Properties of Hypoeutectic Al-Si Alloy Extruded in Semi-Solid State

Abstract:

The microstructures and properties of AlSi7Mg alloy extruded at 575°C in semi-solid state were studied for analyzing the extruding feasibility of the casting aluminum alloy in high solid fraction. The results show that the microstructure of AlSi7Mg alloy through low-superheat direct chill (DC) casting mainly consists of the homogeneous, fine rosette-shaped grains. The microstructure of the billet reheated at 575°C in 15min is composed of stable and near- spherical grains, which are suitable for thixoforming in high solid fraction. Extruded at 575°C in the semi-solid state, the facial-smoothed parts of AlSi7Mg alloy with homogeneous, fine microstructure across the section is obtained, and the properties of extruded part are improved obviously.

• Periodical: Applied Mechanics and Materials (Volumes 152-154)
• Pages: 326-330
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.152-154.326
• Online since: January 2012
• Authors: Da Zhi Zhao, Fu Xiao Yu, Fang Liu, Ke Zhun He, Liang Zuo
• Keywords: AlSi7Mg Alloy, Direct Chill Casting, Extrusion, Microstructure, Property Analysis

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