铝合金中单层Mg-GP,Si-GP区的高分辨电子显微镜图像的计算机模拟

Al-Mg-Si合金析出强化相的前驱相(GP区)的形成对于析出强化的性能有重要影响,但是由于其尺度极其微小,往往很难直接观察. 本文通过对Al-Mg-Si合金中可能存在的单层富Mg及富Si GP区的不同厚度、不同存在形态进行全方位计算机模拟,确认了GP区成像的存在条件. 单层富Mg或富Si GP区在不被铝合金基体包裹的试料中可以形成清晰的高分辨电子显微镜像,并且Mg-GP区与Si-GP区呈现出相反的对比. 这为GP区的高分辨电镜观察提供了可靠的理论依据.

The computer simulation of the high-resolution electron microscope imagesabout monolayer Mg-GP, Si-GP zone in aluminum alloy

The formation of precursor phases(GP zones) of the Al-Mg-Si alloy has an important influence on the property of ageing precipitated phase.But the size of the GP zone is very small,which is difficult to observe directly.Computer simulation of high-resolution electron microscope images of the Mg-rich and Sirich monolayer GP zone was carried out.Simulation results showed that clear high-resolution electron microscope images could be obtained when the GP zones are located on the surface of Al matrix.Simulation ...