Effect of plastic deformation on microstructure and hardness of AlSi/A1 gradient composites

• Published in: Transactions of Nonferrous Metals Society of China Vol. 17; no. 6; pp. 1186 - 1193
• Main Author: 张卫文 罗宗强 夏伟 李元元
• Format: Journal Article
• Language: English
• Published: 2007
• Subjects: AlSi复合物; 塑性变形; 微观结构; 连续铸造
• ISSN: 1003-6326

The effects of plastic deformation on the evolution of microstructure and micro-hardness were studied on plates made from a cylindrical ingot of AISi/AI aluminum composite. This ingot was produced by double-stream-pouring continuous casting（DSPCC）. The results show that the three layers, i.e. the external pure aluminum, internal AI-Si alloy and the transition gradient layer, are maintained after compression as well as rolling processing. With the decrease in thickness of the gradient composite plate, the fluctuation of micro-hardness in transition layer in the direction normal to the applied force is significantly reduced. A simplified lamination model was used to evaluate qualitatively the micro-hardness distribution in the direction parallel to the applied force. However, the model is invalid in the explanation of the fluctuation of the micro-hardness in the direction normal to the applied force. The micro-hardness distribution variation in this direction is mainly attributed to the deformation of a（Al） matrix incorporated the dissolution and spheroidization of eutectic silicon phase.