| 电脉冲处理对Sn-15%Pb合金凝固组织中枝晶形态的影响 |
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| 引用本文： | 王静松,薛庆国,石向东,范方国,许建国,苍大强.电脉冲处理对Sn-15%Pb合金凝固组织中枝晶形态的影响[J].北京科技大学学报,2005,27(2):193-196. |
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| 作者姓名： | 王静松 薛庆国 石向东 范方国 许建国 苍大强 |
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| 作者单位： | 北京科技大学冶金与生态工程学院,北京,100083 |
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| 基金项目： | 国家高技术研究发展计划(863计划) |
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| 摘 要： | 研究了电脉冲处理对Sn-15%Pb合金凝固组织的影响.通过对Sn-15%Pb合金熔体施加电脉冲处理,其凝固组织发生了由原始的树枝晶向球状组织的转化,同时晶粒发生明显细化.分析认为,由于电脉冲处理作用,合金熔体结构发生了改变,使熔体中Pb的活度提高,进而引起溶质平衡分配系数的变化,导致凝固前沿的溶质富集减轻,溶质分布情况发生改变,促使树枝晶向球状组织转化,并且使凝固组织发生细化.
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| 关 键 词： | Sn-15％Pb合金 电脉冲 熔体结构 凝固组织 活度 脉冲处理 合金熔体 凝固组织 形态 影响 Alloy solidification structure process modification pulse 组织转化 球状组织 分布情况 富集 溶质 变化 分配系数 质平衡 活度 熔体结构 |
| 修稿时间： | 2004年4月10日 |
Effect of derect pulse modification process on solidification structure of Sn- 15%Pb Alloy |
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| Wang Jingsong,Xue Qingguo,Shi Xiangdong,FAN Fangguo,XU Jianguo,Cang Daqiang.Effect of derect pulse modification process on solidification structure of Sn- 15%Pb Alloy[J].Journal of University of Science and Technology Beijing,2005,27(2):193-196. |
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| Authors: | Wang Jingsong Xue Qingguo Shi Xiangdong FAN Fangguo XU Jianguo Cang Daqiang |
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| Abstract: | The influence of electric pulse modification (EPM) process on the solidification structure of Sn-15% Pb alloy was experimentally investigated. It was shown that after the molten alloy was treated by electric pulse the solidification structure changed from dendrite shape to cellular shape, and the grains were obviously fined. The mechanism of the change in solidification structure by EPM was discussed. The results indicated that EPM process makes the liquid structure of the alloy change: The activity of Pb in the molten Sn-Pb alloy increases, the distribution coefficient tends to 1, the solute enrichment in front of the solid-liquid interface decreases, and the solute distribution changes. All these lead to the change of solidification structure from dendrite to cellular. |
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| Keywords: | Sn-15%Pb alloy electro-pulse liquid structure solidification structure activity |
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