论文标题
晶体重建驱动的修饰机械性能
Crystallographic Reconstruction Driven Modified Mechanical Properties in Anisotropic Rhenium Disulfides
论文作者
论文摘要
对机械行为的原子尺度研究非常需要完全了解脆性材料的断裂力学，这些机械由原子级现象（例如，晶格捕获）确定。在这里，根据传播方向，使用去除角质的各向异性rhenuium二硫化物（RES2）薄片来研究原子尺度裂纹的传播。尽管常规应变应力曲线取决于RES2的裂解方向，但实验结果表明，由于[100]中的晶格重建，裂解较低，裂解各向异性降低，并且对裂缝的抗性高。换句话说，[010]和[110]的裂纹裂纹较低，表现出没有塑料变形的裂纹尖端的最终清晰度，而[100]裂纹驱动裂缝一侧的晶格旋转，从而导致非纤维晶粒边界形成。最后，与二维材料的高晶格随机性相关的晶体学重建驱动器具有改进的裂解趋势，进一步表明了原子级研究的重要性，以完全了解机械师。
Atomic-scale investigation on mechanical behaviors is highly necessary to fully understand the fracture mechanics especially of brittle materials, which are determined by atomic-scale phenomena (e.g., lattice trapping). Here, exfoliated anisotropic rhenium disulfide (ReS2) flakes are used to investigate atomic-scale crack propagation depending on the propagation directions. While the conventional strain-stress curves exhibit a strong anisotropy depending on the cleavage direction of ReS2, but our experimental results show a reduced cleavage anisotropy due to the lattice reconstruction in [100] cracking with high resistance to fracture. In other words, [010] and [110] cracks with low barriers to cleavage exhibit the ultimate sharpness of the crack tip without plastic deformation, whereas [100] cracks drive lattice rotation on one side of the crack, leading to a non-flat grain boundary formation. Finally, crystallographic reconstruction associated with the high lattice randomness of two-dimensional materials drives to a modified cleavage tendency, further indicating the importance of atomic-scale studies for a complete understanding of the mechanics.
