纳米孪晶金属以其优异的力学性能和良好的导电性受到广泛关注,该材料的变形行为是材料学家长期关注的问题之一。作为一类大角度晶界,共格孪晶界能够强烈地阻碍位错的运动,提高材料的强度,一般来说孪晶片层厚度越小,纳米孪晶材料的强度也应该越高。然而,实验发现,当孪晶片层厚度减小到一个临界 Due to its excellent mechanical properties and good electrical conductivity, nano-twin metal has drawn much attention. The deformation behavior of nano-TWM is one of the long-term concerns of the materials scientists. As a kind of large-angle grain boundary, coherent twin boundaries can strongly impede the movement of dislocations and improve the strength of the material. Generally speaking, the smaller the thickness of the twins, the higher the strength of the nano twin material. However, it was experimentally found that the twin wafer thickness decreased to a critical mass