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Formation of different surface reliefs of metallic glasses under mechanical stress

机译：机械应力作用下金属玻璃表面浮雕的形成

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摘要

The micro- and nanoreliefs of loaded lateral surfaces and fracture surfaces of foils of the Fe_(77)Ni_1Si_9B_(13), Fe_(58)Ni_(20)Si_9B_(13), and Fe_(70)Cr_(15)B_(15) amorphous alloys have been investigated using scanning tunneling and atomic force microscopy. The isotropic and anisotropic surface reliefs have been examined. The fractal dimensions of the surfaces of loaded specimens and the fracture surfaces along and across the direction of crack propagation have been estimated using the box counting method. Fractal characteristics of the surfaces, such as the H?lder exponent and the half-width of the singularity spectrum, have been calculated using the wavelet transform method. It has been found that, on the topographies with a clearly pronounced anisotropy of the relief, the surface is fractal in only one direction, and the surface is fractal in two directions on the topographies with a less pronounced anisotropy of the relief. The fractal characteristics of the lateral surfaces and the fracture surfaces with allowance made for their anisotropy have close values. It has been shown that the formation of two types of fracture surfaces is adequately described in terms of the model of a cellular automaton.
机译：Fe_（77）Ni_1Si_9B_（13），Fe_（58）Ni_（20）Si_9B_（13）和Fe_（70）Cr_（15）B_（15）的箔的加载侧面和断裂表面的微观和纳米浮雕）非晶态合金已使用扫描隧穿和原子力显微镜进行了研究。已经研究了各向同性和各向异性的表面浮雕。使用盒计数法已经估计了沿和沿裂纹扩展方向的加载试样表面和断裂表面的分形维数。使用小波变换方法已经计算出了表面的分形特征，例如H指数和奇异谱的半峰宽。已经发现，在具有明显凸出的各向异性的形貌上，表面在形貌上仅在一个方向上是分形的，而表面在两个方向上是分形的，而凸形的各向异性不那么明显。考虑到它们的各向异性而允许的侧面和断裂面的分形特性具有接近的值。已经表明，根据细胞自动机的模型充分描述了两种类型的断裂表面的形成。

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