School of Mathematics and Statistics, Zhengzhou University, 100 Science Road, Zhengzhou, 450001, China.
Laboratory for Microstructures, Institute of Materials, Shanghai University, Shanghai, 200444, China.
Sci Rep. 2017 Mar 22;7:45083. doi: 10.1038/srep45083.
This paper explores the temporal scaling behavior induced shear-branching structure in response to variant temperatures and strain rates during plastic deformation of Zr-based bulk metallic glass (BMG). The data analysis based on the compression tests suggests that there are two states of shear-branching structures: the fractal structure with a long-range order at an intermediate temperature of 223 K and a larger strain rate of 2.5 × 10 s; the disordered structure dominated at other temperature and strain rate. It can be deduced from the percolation theory that the compressive ductility, e, can reach the maximum value at the intermediate temperature. Furthermore, a dynamical model involving temperature is given for depicting the shear-sliding process, reflecting the plastic deformation has fractal structure at the temperature of 223 K and strain rate of 2.5 × 10 s.
本文探讨了在 Zr 基块状金属玻璃（BMG）的塑性变形过程中，响应于不同温度和应变速率的剪切分支结构的时间标度行为。基于压缩试验的数据分析表明，剪切分支结构存在两种状态：在中间温度 223 K 和较大应变速率 2.5×10 s 下具有长程有序的分形结构；在其他温度和应变速率下以无序结构为主。可以从渗流理论推断，在中间温度下，压缩延展性 e 可以达到最大值。此外，还给出了一个涉及温度的动力学模型来描述剪切滑动过程，反映了在 223 K 温度和 2.5×10 s 应变速率下的塑性变形具有分形结构。
