| Al65Bi28Cu7偏晶合金的液-液相分离及凝固行为 |
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| 引用本文： | 张娜,于延军,王玉青,赵德刚.Al65Bi28Cu7偏晶合金的液-液相分离及凝固行为[J].山东大学学报(工学版),2020,50(1):123-128. |
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| 作者姓名： | 张娜 于延军 王玉青 赵德刚 |
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| 作者单位： | 山东职业学院,山东 济南250104;济南大学材料科学与工程学院,山东 济南250022 |
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| 基金项目： | 山东职业学院科研基金资助项目(KY-XY-201717) |
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| 摘 要： | 利用电阻率法研究铜模冷却条件下Al65Bi28Cu7偏晶合金的液-液相分离过程,并分析Al65Bi28Cu7偏晶合金核壳结构的形成机理。研究结果表明,电阻率与温度关系曲线(ρ-T曲线)的异常变化证实了Al65Bi28Cu7偏晶合金熔体的凝固先后经历了液-液相分离、偏晶反应和共晶反应,在偏晶反应温度以上ρ-T曲线出现的非线性变化主要来源于熔体内的浓度起伏。Al65Bi28Cu7偏晶合金能够形成富Bi相包裹富Al相的核壳结构。
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| 关 键 词： | 偏晶合金 液相分离 电阻率法 凝固 |
| 收稿时间： | 2019-01-03 |
Liquid-liquid phase separation and solidification behavior of Al65Bi28Cu7 monotectic alloy |
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| Na ZHANG,Yanjun YU,Yuqing WANG,Degang ZHAO.Liquid-liquid phase separation and solidification behavior of Al65Bi28Cu7 monotectic alloy[J].Journal of Shandong University of Technology,2020,50(1):123-128. |
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| Authors: | Na ZHANG Yanjun YU Yuqing WANG Degang ZHAO |
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| Affiliation: | 1. Shandong Polytechnic, Jinan 250104, Shandong, China2. School of Materials Science and Engineering, University of Jinan, Jinan 250022, Shandong, China |
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| Abstract: | The liquid-liquid phase separation of Al65Bi28Cu7 monotectic alloy melt cast in copper mould was investigated by resistivity method. The formation mechanism of core-shell structure of Al65Bi28Cu7 monotectic alloy was discussed. The results showed that the anomalous changes in ρ-T curve confirmed the occurrence of liquid phase separation, monotectic reaction and eutectic reaction in the solidification of Al65Bi28Cu7 monotectic alloy melt. The anomalous change above monotectic temperature in ρ-T curve should be attributed to the concentration fluctuation of melt. The core-shell structure of Al-rich core covered by Bi-rich could form in the Al65Bi28Cu7 monotectic alloy. |
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| Keywords: | monotectic alloy liquid phase separation resistivity method solidification |
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