Microstructure evolution and precipitation of SiC particle reinforced Al-20Si composite solidified under high pressures

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• 作者：Pan Ma ; Chunming Zou ; Hongwei Wang ; Jinchuan Jie ; Yandong Jia ; Binguo Fu ; Zunjie Wei ; ^{weizj@hit.edu.cn}
• 关键词：Metal matrix composites ; High pressure solidification ; Microstructure ; GP zones ; Precipitation
• 刊名：Materials Letters
• 出版年：2012
• 期刊代码：59_0167577x
• 类别：ms
• 出版时间：15 July, 2012
• 卷：79
• 期：Complete
• 页码：232-234
• 文件大小：894 K

摘要

Evolution of microstructure and precipitation process of 40%SiC_p/Al-20Si composite solidified under high pressures were investigated. The results demonstrate that undissolved Si phase under 1 GPa is much smaller than 0.02 GPa, and disappears under 2 GPa. Primary 伪-Al phase appears at 1 GPa, and with increased pressure, more primary 伪-Al phase emerges. Eutectic silicon phase is modified effectively under high pressures. A supersaturated Al(Si) solid solution is obtained. GP zones form in primary 伪-Al phase when solidified under 3 GPa and nature aging for 400 days. Dispersed and fine Si phase precipitates by manual aging at 209 掳C.