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

来源期刊：中国有色金属学报(英文版)2007年第6期

论文作者：张卫文 罗宗强 夏伟 李元元

文章页码：1186 - 1193

Key words：continuous casting; plastic deformation; gradient composites; microstructure; hardness

Abstract: The effects of plastic deformation on the evolution of microstructure and micro-hardness were studied on plates made from a cylindrical ingot of AlSi/Al 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 Al-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 α(Al) matrix incorporated the dissolution and spheroidization of eutectic silicon phase.

基金信息：the National Natural Science Foundation of China