Effect of derect pulse modification process on solidification structure of Sn-15%Pb Alloy
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摘要: 研究了電脈沖處理對Sn-15%Pb合金凝固組織的影響.通過對Sn-15%Pb合金熔體施加電脈沖處理,其凝固組織發生了由原始的樹枝晶向球狀組織的轉化,同時晶粒發生明顯細化.分析認為,由于電脈沖處理作用,合金熔體結構發生了改變,使熔體中Pb的活度提高,進而引起溶質平衡分配系數的變化,導致凝固前沿的溶質富集減輕,溶質分布情況發生改變,促使樹枝晶向球狀組織轉化,并且使凝固組織發生細化.
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關鍵詞:
- Sn-15%Pb合金 /
- 電脈沖 /
- 熔體結構 /
- 凝固組織 /
- 活度
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.-
Key words:
- Sn-15%Pb alloy /
- electro-pulse /
- liquid structure /
- solidification structure /
- activity
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