| Ca对Al2O3（P）／Al—Si复合材料凝固组织的影响 |
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| 引用本文： | 吴树森,黄乃瑜.Ca对Al2O3（P）／Al—Si复合材料凝固组织的影响[J].金属学报,1999,35(6):663-667. |
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| 作者姓名： | 吴树森 黄乃瑜 |
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| 作者单位： | 华中理工大学材料科学与工程学院!武汉，430074，华中理工大学材料科学与工程学院!武汉，430074，华中理工大学材料科学与工程学院!武汉，430074，华中理工大学材料科学与工程学院!武汉，430074 |
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| 基金项目： | 中国博士后科学基金![1998]9号 |
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| 摘 要： | 本文利用定向凝固方法研究了Ａｌ２Ｏ３／Ａｌ－Ｓｉ复合材料溶液中添加微量Ｃａ对基体组织及Ａｌ２Ｏ３颗粒分布的影响，结果表明，Ｃａ能够细化，Ａｌ－Ｓｉ合金基体的共晶Ｓｉ，但Ｓｒ变质时添加Ｃａ，Ｃａ对Ｓｒ的共晶Ｓｉ细化能力具有阻碍作用，Ａｌ－Ｓｉ－Ｓｒ－Ｃａ中Ｃａ的变质阻碍作用可能是因为生成Ｃａ－Ｓｒ－Ｓｉ金属间化合物消耗了溶液中的Ｓｒ，单独添加Ｃａ或Ｓｒ时，Ａｌ２Ｏ３颗粒部被凝固界面所排斥和推移，在固
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| 关 键 词： | 金属基 复合材料 变质 凝固组织 钙 |
INFLUENCE OF CALCIUM ON SOLIDIFICATION STRUCTURE OF Al_2O_3(p)/Al-Si COMPOSITES |
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| WU Shusen, HUANG Naiyu, AN Ping, WU Guangzhong.INFLUENCE OF CALCIUM ON SOLIDIFICATION STRUCTURE OF Al_2O_3(p)/Al-Si COMPOSITES[J].Acta Metallurgica Sinica,1999,35(6):663-667. |
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| Authors: | WU Shusen HUANG Naiyu AN Ping WU Guangzhong |
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| Abstract: | The induences of addition of trace calcium to the melt of Al2O3/Al-Si composites onmatrix structures and particle distribution have been studied with directional solidification method. Resultsshow that calcium has fining effect on eutectic St in the Al-Si alloy matrix, the fining of hilt eutectic Siby strontium is significantly obstructed when strontium and calcium are added at the same time. Themodifying obstruction mechanism of Ca in Al-Si-Sr-Ca alloy is postulated as that the formation ofintermetailic compound Ca-Sr-Si consumes some of Sr in the melt. When Ca or Sr is added separately,Al2O3 Particles are all rejected and pushed by freezing front, and not uniformly distributed in solid.However, when Sr and Ca are added at the same time, Al2O3 particles could be uniformly distributed inthe solid. |
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| Keywords: | metal metrix composite Al-Si alloy modification solidification structure |
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