高分辨像的解卷处理用于S-Al2 CuMg相及孪晶界面结构确定

摘要

S-Al2CuMg相是Al-Cu-Mg合金中重要的强化相,但它的晶体学结构还存在争议.利用高分辨电子显微学和像的解卷处理技术,获得了Al-Cu-Mg合金中S-Al2CuMg相在[100],[010]和[001]的原子投影图,进而验证PW模型是S相正确的结构模型.另外,将动力学校正引入到S相孪晶图像的处理过程,确定了S相孪晶面的位置.像解卷处理方法首次应用于金属材料并确定了S相缺陷结构,说明该方法适用于金属材料.通过解卷处理方法可以使原本不直接对应所观察材料的高分辨晶格像转变成点分辨率达到电镜的信息分辨极限的结构像.%S-Al2CuMg phase is one of the important strengthening phases in Al-Cu-Mg alloys,but its crystal structure remains controversial.The PW model was indentified to be the right structure model for the S-Al2CuMg phase in Al-Cu-Mg alloys based on the obtained atomic projections along [100],[010] and [001] zone axes by using high-resolution TEM (HRTEM) and image deconvlution method.,.The habit plane of twin boundary in the S phase was also determined using this method with consideration of the diffraction dynamics.Image deconvolution was applied to solve complex structures/defects for the first time in metallic material and confirmed successfully the defect structure of S phase.The experimental lattice images that do not show directly the atomic structure/projection of the examined samples can be transformed into structure maps by deconvolution processing with the structure resolution enhanced up to the information limit of the microscope.