Valence electron structure analysis of refining mechanism of Sc and Ti additions on aluminum |
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Authors: | PieJie Li YiCong Ye LiangJu He |
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Affiliation: | (1) Sino-Russia Light Metals International Cooperate R&D Center, Department of Mechanical Engineering, Tsinghua University, Beijing, 100084, China;(2) School of Aerospace, Tsinghua University, Beijing, 100084, China |
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Abstract: | The mechanism of the difference of refining effect between Sc and Ti adding to aluminum can not be explained substantially with traditional theory. Valence electron structures of Al-Ti and Al-Sc alloys have been studied by using the empirical electron theory of solids and molecules (EET). The covalent bond electron numbers and interfacial electron density differences are calculated. The conclusion is that, in the two alloys, different covalent bond electron numbers of nucleation particles, and different electron densities on the interface between the second phase particles and the matrix, fundamentally lead to the difference of refining effect between Sc and Ti adding to aluminum. Supported by the Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20050003042) |
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Keywords: | EET refinement mechanism valence electron structure (VES) Al3Sc Al3Ti |
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