| Effect of plastic deformation on microstructure and hardness of AlSi/A1 gradient composites |
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| 作者姓名： | 张卫文 罗宗强 夏伟 李元元 |
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| 作者单位： | School of Mechanical Engineering, South China University of Technology, Guangzhou 510640, China |
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| 基金项目： | Foundation item： Projects（50575076; 59905007） supported by the National Natural Science Foundation of China |
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| 摘 要： | 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.
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| 关 键 词： | 连续铸造 塑性变形 AlSi复合物 微观结构 |
| 收稿时间： | 15 July 2007 |
| 修稿时间： | 2007-07-15 |
Effect of plastic deformation on microstructure and hardness of AlSi/Al gradient composites |
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| Wei-wen ZHANG, Zong-qiang LUO, Wei XIA,Yuan-yuan LI.Effect of plastic deformation on microstructure and hardness of AlSi/A1 gradient composites[J].Transactions of Nonferrous Metals Society of China,2007,17(6):1186-1193. |
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| Authors: | Wei-wen ZHANG Zong-qiang LUO Wei XIA Yuan-yuan LI |
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| Affiliation: | School of Mechanical Engineering, South China University of Technology, Guangzhou 510640, China |
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| 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  (Al) matrix incorporated the dissolution and spheroidization of eutectic silicon phase. |
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| Keywords: | continuous casting plastic deformation gradient composites microstructure hardness |
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