| Modification mechanism of cerium on the Al-18Si alloy |
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| 作者姓名： | ZHANG Henghua DUAN Haili SHAO Guangjie XU Luoping YIN Junlin YAN Biao |
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| 作者单位： | [1]School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China [2]School of Materials Science and Engineering, Tongji University, Shanghai 200092, China |
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| 基金项目： | 上海市领先专业学科基金 |
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| 摘 要： | The effect of the rare earth cerium （Ce） on the hypereutectic Al-Si alloy under different casting states have been studied by optical microscope and quantitative image analysis. It is found that the size and the quantity of primary silicon in castings decrease with the increase of added Ce in the melt. Meanwhile primary silicon changes from branched shape to fine facetted shape. Although the modification on eutectic silicon in castings also improves with the increase of added Ce in the melt, the effect of modification on eutectic silicon away from primary silicon is more obvious than that on eutectic silicon close to primary silicon. The modification mechanism was analyzed in detail by means of scanning electron microscope equipped with energy dispersive analysis of X-ray and thermodynamics analysis, which included the analysis on the change in standard Gibbs energy of reaction and reaction equilibrium.
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| 关 键 词： | 金属材料 改性机理 热力学分析 稀土元素 过共晶体铝-硅合金 铈 |
| 收稿时间： | 2005-05-19 |
Modification mechanism of cerium on the Al-18Si alloy |
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| ZHANG Henghua DUAN Haili SHAO Guangjie XU Luoping YIN Junlin YAN Biao.Modification mechanism of cerium on the Al-18Si alloy[J].Rare Metals,2006,25(1):11-15. |
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| Authors: | ZHANG Henghua DUAN Haili SHAO Guangjie XU Luoping YIN Junlin YAN Biao |
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| Affiliation: | 1. Institute of Metals and Technology, Lepi pot 11, Ljubljana SI-1000, Slovenia;2. Faculty of Mechanical Engineering, University of Ljubljana, A?ker?eva 6, Ljubljana SI-1000, Slovenia |
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| Abstract: | The effect of the rare earth cerium (Ce) on the hypereutectic Al-Si alloy under different casting states have been studied by optical microscope and quantitative image analysis. It is found that the size and the quantity of primary silicon in castings decrease with the increase of added Ce in the melt. Meanwhile primary silicon changes from branched shape to fine facetted shape. Although the modification on eutectic silicon in castings also improves with the increase of added Ce in the melt, the effect of modification on eutectic silicon away from primary silicon is more obvious than that on eutectic silicon close to primary silicon. The modification mechanism was analyzed in detail by means of scanning electron microscope equipped with energy dispersive analysis of X-ray and thermodynamics analysis, which included the analysis on the change in standard Gibbs energy of reaction and reaction equilibrium. |
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| Keywords: | metal material modification mechanism thermodynamics analysis rare earth element hypereutectic Al-Si alloy |
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