【作者】 高英俊； 黄创高； 韦银燕； 刘慧； 莫其逢；

【Author】 Gao Yingjun, Huang Chuanggao, Mo Qifeng, Wei Yinyan, Liu Hui(College of Physics Science and Technology , Guangxi University , Nanning 530004 , China ;Central of International Material and Physics , Chinese Academy of Sciences , Shenyang 150016 , China)

【机构】 广西大学物理科学与工程技术学院；

【摘要】 运用固体经验电子理论(EET),对Al-Li合金时效初期的偏聚晶胞的价电子结构进行计算。计算结果表明:不包含空位的偏聚晶胞的键络最强键为Al-Al键,其中Al原子的共价半径较Li原子的共价半径要大;而含空位的偏聚晶胞的最强键为Al-Li键,Al原子的共价半径要比Li原子的共价半径要小。析出的(Al3Li)与基体共格,键络强度明显提高,其大量均匀弥散析出起到提升基体整体键络强度,对合金产生强化作用。由于Al-Sc结合键较强,因此在凝固过程中生成的Al3Sc粒子成为Al3Li的非均质形核,使合金析出的Al3Li粒子细化,提高合金的强度。更多还原

【Abstract】 The valence electron structures of the segregated cell of Al-Li alloy in earlier aging condition are calculated according to the empirical electron theory (EET) in solid. The results show that the strongest bond is the Al-Al bond in the segregated cell without containing vacancy. The Al atomic covalence radius is greater than that of Li atom in the cell, and the strongest bond is the Al-Li bond in the segregated cell containing vacancy. The Al atomic covalence radius in the cell is less than that of Li atom. The bond net of δ′(Al3Li) has the picture of anisotropic A1-A1 bonding and the bond intensity is enhanced. Since δ′(Al3Li) is coherence with matrix, the bond net strength is enhanced by the precipitation, and so strengthening the alloy. Because of the strongest Al-Sc bond in alloy, it is easy to form the Al3Sc before the solid solution treatment . The Al3Sc particles act as a heterogeneous nu-cleation to refine the Al3Li particles.更多还原