Modification mechanism of cerium on the Al-18Si alloy

稀有金属（英文版）, 2006, 25(1): 11-15.

^1, , ^2, , ^3, , ^4, , ^5, , ^6,

1.School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China

2.School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China

3.School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China

4.School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China

5.School of Materials Science and Engineering, Tongji University, Shanghai 200092, China

6.School of Materials Science and Engineering, Tongji University, Shanghai 200092, China

基金项目: 上海市领先专业学科基金(T0101) the Open Funds of Shanghai Key Laboratory of Metal Function Materials Research and Application

Modification mechanism of cerium on the Al-18Si alloy

Keywords： metal material

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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Modification mechanism of cerium on the Al-18Si alloy

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