The Study Of Al-Mg-Si Alloys With Electron Theory

The valence electron structures of maid phases, phase, interphase boundaries and its effects on the properties of Al-Mg-Si based alloy were analyzed. It is listed as follows:1.The solid solution of Al-Mg-Si based alloy was contained three main cells:a-Al cell, Si cell and Mg2Si cell. According to the Empirical Electronic Theory in solid and molecules (EET), the valence electronic structures of these cell, the valence electron structures of phase and interphase boundaries between the matrix and the cells above, the bonding density lie in strongest bonding of β-Si and Mg2Si (β) and the precipitations were calculated.2. The phase configurations, F and S were calculated which also affect the properties of the alloy.3. Through above analysis, the results show that:The strong interaction of Mg and Si in solid solution of Al-Mg-Si based alloy, which lead to the behavior of Mg2Si segregation. The excess Si contentcan lead to grow more Mg2Si. The electon density lie in strongest bonding of Si is larger than that of Mg2Si. The strong segregations are restrained the growth of the matrix and make the grain fined.On the interphase boundaries between the matrix and the precipitates, such as (001)Mg2Si//(001)Al,(100)Si//(110)Al. The electronic density are notcontinued in Al-Mg-Si based alloy, which lead to reduce of the properties of the alloy. Furthermore, the phase configurations also lead to reduce the properties of alloy.