Microstructures and Properties of Hypoeutectic Al-Si Alloy Extruded in Semi-Solid State
Microstructures and Properties of Hypoeutectic Al-Si Alloy Extruded in Semi-Solid State
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DOI：
10.4028/www.scientific.net/amm.152-154.326
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发表时间：
2012-01
期刊：
影响因子：
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通讯作者：
D. Zhao;F. Yu;Fang Liu;K. He;L. Zuo
中科院分区：
文献类型：
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作者：
D. Zhao;F. Yu;Fang Liu;K. He;L. Zuo
为分析高固相率铸造铝合金挤压成形的可行性，研究了AlSi7Mg合金在575°C半固态挤压成形的组织和性能。结果表明，低凝固温度下直接激冷铸造AlSi7Mg合金的显微组织主要由均匀细小的玫瑰花状晶粒组成。在575°C加热15min的坯料组织由稳定的近球形晶粒组成，适合于高固相率下的触变成形。在575°C半固态挤压时，获得了断面组织均匀、细小的AlSi7Mg合金表面光滑件，挤压件的性能明显提高。
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.