| 过共晶Al－Si合金共生区激光表面处理 |
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| 引用本文： | 宋宙模,蔡猛,伍长征,吴嘉达,李富铭. 过共晶Al－Si合金共生区激光表面处理[J]. 中国激光, 1995, 22(3): 233-236 |
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| 作者姓名： | 宋宙模 蔡猛 伍长征 吴嘉达 李富铭 |
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| 作者单位： | 上海三束材料改性国家重点联合实验室复旦大学分部复旦大学物理系，西北工业大学应用物理系 |
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| 摘 要： | 用２ｋＷ连续ＣＯ２激光对过共晶Ａｌ－１８Ｓｉ合金以不同能量密度和扫描速度进行快速熔凝处理。用扫描电镜、电子微区分析仪分析了微观结构。从计算机对Ａｌ－Ｓｉ合金ｆ－ｎｆ系统的非平衡理论计算所得的共生区及实验结果的分析可见，当能量密度和扫描速度决定的凝固条件处于共生区中部时，过共晶Ａｌ－Ｓｉ合金激光表面处理可以得到共晶间距低于２００ｎｍ的完全共晶结构。
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| 关 键 词： | 过共晶铝硅合金，激光表面处理，共晶共生生长 |
| 收稿时间： | 1994-02-24 |
Laser Surface Treatment of Hypereutectic Al-Si Alloy with Coupled Eutectic Growth |
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| Song Zhoumo, Cai Men, Wu Changzheng, Wu Jiada, Li Fumin. Laser Surface Treatment of Hypereutectic Al-Si Alloy with Coupled Eutectic Growth[J]. Chinese Journal of Lasers, 1995, 22(3): 233-236 |
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| Authors: | Song Zhoumo Cai Men Wu Changzheng Wu Jiada Li Fumin |
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| Abstract: | Hypereutectic Al- 18Si alloy is remelted and solidified rapidly with a 2 kW CO2 CW laser under different power densities and scanning velocities. The microstructures in the treated zone are analysed with SEM and an electron microprobe analyser. From the analysis of experimental results and the coupled zone computed for the f-n f system of Al-Si alloy with a nonequilibrium theory, it is shown that if the conditions of solidification determined by power density and scanning velocity are established in the central part of the coupled zone, a full eutectic structure with an eutectic spacing below 200 nm can be obtained using laser surface treatment for hypereutectic Al-Si alloy |
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| Keywords: | hypereutectic Al-Si alloy laser surface treatment coupled eutectic growth |
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