【作者】 高英俊； 刘慧； 黄创高； 班冬梅； 吴伟明；

【Author】 Gao Yingjun , Liu Hui, Huang Chuanggao, Ban Dongmei,Wu Weiming( School of Physics Science and Engineering, Guangxi University, Nanning 530004, China ; International Central of 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),对掺微量Sc的Al-Mg合金的价电子结构进行计算。结果表明:在合金熔体中Sc与Al原子存在强的结合倾向,易形成粗大的Al3Sc颗粒,起非匀质形核细化晶粒作用;在合金凝固过程中,形成Al-Sc偏聚区,析出细小弥散的Al3Sc颗粒,增强了合金基体和晶界的共价键络,使合金的硬度、强度和晶粒热稳定性都得到提高。更多还原

【Abstract】 The valence electron structures of Al-Mg alloy with minor Sc were analyzed based on the "Empirical Electronic Theory in solid" (EET). The results show that there is a strong combined tendency between Sc and Al atoms in melt during solidification, and easily form the coarse Al3Sc particles, act as a heterogeneous nucleation refinement. During solidification ofalloy, the strong interaction between Sc and Al atoms results in forming the zone of Al-Sc segregation, precipitating the dispersion refining Al3Sc particles during homogenization, so strengthen the covalence bond in bulk and interface of alloy, and enhancing the hardness , intensity and thermal stability of alloy.更多还原