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利用H-800透射电镜观测表面机械研磨(SMA)1420铝锂合金样品的微观组织结构特征。研究发现,经表面机械研磨处理后1420铝锂合金样品表层发生了严重的塑性变形,从最表层到基体,大致形成四个阶段的变化:纳米层、亚微米层、过渡层、基体组织。其中在过渡层的位错胞结构也很好地映衬出了计算模拟纳米晶体的结构,为进一步研究其纳米化机制奠定了基础。
The microstructure of 1420 Al-Li alloy was observed by H-800 transmission electron microscopy. The results show that the surface of the 1420 Al-Li alloy sample undergoes severe plastic deformation after surface mechanical grinding treatment. From the outermost layer to the matrix, four stages of changes are basically formed: nano layer, submicron layer, transition layer and matrix structure. The dislocation cell structure in the transitional layer also well reflects the structure of the calculated simulated nanocrystals, which lays the foundation for further study of the nanocrystallization mechanism.