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将常规多晶材料的粗晶粒尺寸缩小到纳米尺度时,这些纳米晶体材料会呈现出与其对应的粗晶材料迥异的物理现象.与材料力学行为最相关的是强度及塑形变形机理这两个方面.考虑到晶界的变形与破坏可能是纳米晶体材料低塑性的根源,克服纳米晶体材料中强度与韧性之间存在的“熊掌和鱼不可兼得”的问题,也通常称为晶界工程.在众多的晶界中,孪晶界面被发现可同时保持材料的强度和韧性.本文主要就纳米金属材料中界面的力学行为做一个简要综述,包含晶界的强化力学机理以及新型孪晶界面的力学行为与揭示内在尺度效应的模型研究.
When the coarse grain size of the conventional polycrystalline material is reduced to the nanometer scale, these nanocrystalline materials exhibit different physical phenomena from the corresponding coarse-grained materials, and the two most relevant to the mechanical behavior of the material are the strength and the deformation mechanism Aspects of the grain boundary deformation and damage may be considered the source of low plasticity of nanocrystalline materials to overcome the strength and toughness of nanocrystalline materials exists between the “bear’s paw and fish can not have both” is often said Is a grain boundary engineering.In many grain boundaries, the twin interface is found to maintain the strength and toughness of the material at the same time.In this paper, a brief review is made on the mechanical behavior of the interface in nanometallic materials, including the mechanics of strengthening the grain boundaries and MECHANICAL BEHAVIOR OF A NOVEL TWIN INTERFACE AND A MODEL INVOLVING INNER SCALE EFFECTS.