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为了研究金属的超快变形机理,利用强流脉冲电子束(HCPEB)技术对多晶纯Cu进行了辐照处理,并利用透射电子显微镜对HCPEB诱发的表面微结构进行了表征.实验结果表明,HCPEB轰击多晶纯Cu后,在轰击表层诱发了幅值极大的应力和极高的应变速率.1次HCPEB轰击材料表层的变形结构以交滑移形成的位错胞和位错缠结结构为主;多次轰击后平行的位错墙和孪晶是该区域的主要变形结构特征;原子面的扩散乃至位错攀移可在晶界和孪晶界上形成台阶结构.根据各自区域的变形结构特征,对相应的变形机理进行了探讨.
In order to study the mechanism of ultrafast deformation of metal, pure HpcB was irradiated by HCPEB and the surface microstructure induced by HCPEB was characterized by transmission electron microscopy.The experimental results show that, HCPEB bombardment of pure Cu, the bombardment of the surface induced a great amplitude of stress and very high strain rate .1 HCPEB bombardment of the surface deformation of the structure to cross slip dislocation cells formed dislocation and dislocation structure The dislocation walls and twins which are parallel after multiple bombardment are the main deformation structural features in this area. The diffusion of atomic planes and the displacement of dislocations can form step structures on the grain boundaries and twin boundaries. Deformation structure characteristics, the corresponding deformation mechanism were discussed.