摘要
Friction stir processing （FSP） was used to incorporate SiC particles into the matrix of A356 Al alloy to form composite material. Constant tool rotation speed of 1800 r/min and travel speed of 127 mm/min were used in this study. The base metal （BM） shows the hypoeutectic Al-Si dendrite structure. The microstructure of the stir zone （SZ） is very different from that of the BM. The eutectic Si and SiC particles are dispersed homogeneously in primary Al solid solution. The thermo-mechanically affected zone （TMAZ）, where the original microstructure is greatly deformed, is characterized by dispersed eutectic Si and SiC particles aligned along the rotational direction of the tool. The hardness of the SZ shows higher value than that of the BM because some defects are remarkably reduced and the eutectic Si and SiC particles are dispersed over the SZ.
通过搅拌摩擦加工技术将SiC颗粒加入到A356铝合金中制备铝基复合材料,搅拌摩擦加工参数为:旋转速度1800r/min和行进速度127mm/min。基体金属A356铝合金为亚共晶AlSi枝晶组织,而搅拌区的组织与基体金属区不同。共晶Si和SiC颗粒均匀分布于初始铝固溶体中,而经历了剧烈变形的热力影响区的共晶Si和SiC颗粒呈沿旋转方向分散的特征。搅拌区的硬度比基体金属的高,因为在搅拌区存在的缺陷明显减少,共晶Si和SiC均匀分布在其中。
基金
supported by a grant from the Fundamental R & D Program (No.10038688) for Core Technology of Materials funded by the Ministry of Knowledge Economy, Republic of Korea
