| 高密度脉冲电流对A356铝合金低温熔体凝固组织的影响 |
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| 引用本文： | 何树先,王俊,周尧和. 高密度脉冲电流对A356铝合金低温熔体凝固组织的影响[J]. 金属学报, 2002, 38(5): 479-482 |
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| 作者姓名： | 何树先 王俊 周尧和 |
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| 作者单位： | 上海交通大学材料科学与工程学院,上海,200030 |
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| 基金项目： | 美国GM(中国)公司基金资助项目 |
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| 摘 要： | 研究了高密度脉冲电流的A356铝合金低温熔体凝固组织的影响。实验中对680和630℃的低温熔体施加脉冲电流处理。对比试验和凝固曲线测试结果表明。低温熔体中施加脉冲电流有利于增大凝固过冷度，提高冷却速率。缩短凝固时间。细化凝固组织。同时，经脉冲电流处理后，随熔体的保温时间延长。凝固组织逐渐粗化。分析认为，低温熔体结构比凝固过程本身更能影响最终凝固组织。
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| 关 键 词： | 高密度脉冲电流 A356铝合金 低温熔体 凝固组织 |
| 文章编号： | 0412-1961(2002)05-0479-04 |
| 修稿时间： | 2001-09-06 |
EFFECT OF HIGH DENSITY PULSE ELECTRIC CUR RENT ON THE SOLIDIFICATION STRUCTURE OF LOW TEMPERATURE MELT OF A356 ALUMINIUM ALLOY |
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| HE Shuxian,WANG Jun,ZHOU YaoheSchool of Materials Science and Engineering,Shanghai Jiaotong University,Shanghai Correspondent: HE Shuxian,Tel:. EFFECT OF HIGH DENSITY PULSE ELECTRIC CUR RENT ON THE SOLIDIFICATION STRUCTURE OF LOW TEMPERATURE MELT OF A356 ALUMINIUM ALLOY[J]. Acta Metallurgica Sinica, 2002, 38(5): 479-482 |
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| Authors: | HE Shuxian WANG Jun ZHOU YaoheSchool of Materials Science Engineering Shanghai Jiaotong University Shanghai Correspondent: HE Shuxian Tel: |
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| Affiliation: | HE Shuxian,WANG Jun,ZHOU YaoheSchool of Materials Science and Engineering,Shanghai Jiaotong University,Shanghai 200030Correspondent: HE Shuxian,Tel: |
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| Abstract: | The effect of high density pulse electric current (HDPEC) on the solidification structure of the low temperature melt(LTM) of commercial A356 aluminum alloy was investigated. In the experiments, the HDPEC was discharged in the LTM(680 and 630 C). The control experiments and cooling curve test show that HDPEC discharged in LTM can increase the undercooling and cooling rate of the solidification, shorten the cooling time and refine the solidification structure. Meanwhile, the holding time of melt treated has an adverse effect on the solidification structure. The longer of the holding time of the melt treated with HDPEC, the coarser the microstructure is. It is analyzed that the effect of the structure of LTM on the final solidification structure is more important than that of the solidification course. |
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| Keywords: | A356 aluminum alloy low temperature melt solidification structure high densitypulse electric currents |
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