Valence electron structure analysis of refining mecha-nism of Sc and Ti additions on aluminum

• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2009,（5）
• 页码范围: 836-841
• 页数: 6页
• 语种: 英文
• DOI: 10.1007/s11434-008-0514-z

摘要

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 AI-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.