Zhang Qi, Li Qi-Kai, Zhao Shao-Fan, Wang Wei-Hua, Li Mo
Qian Xuesen laboratory of Space Technology, NO. 104 Youyi Road, Haidian district, Beijing 100094, People's Republic of China.
J Phys Condens Matter. 2019 Nov 13;31(45):455401. doi: 10.1088/1361-648X/ab3529. Epub 2019 Jul 25.
Deformation of metallic glasses is closely related to their microstructures which depend on the composition, processing method, and the size of the materials. This subtle structure-property relation is fairly complex and remains to be explored. Here, we scrutinize the microstructural evolution in relation to the mechanical properties in metallic glass nanowires with the same composition and size but subtle microstructural differences by controlling the preparing process using molecular dynamics simulations. The results suggest that a structural threshold exists for the transformation of deformation mechanisms in metallic glasses: when the structural feature exceeds the threshold, the deformation changes from homogeneous flow to shear localized deformation.
金属玻璃的变形与它们的微观结构密切相关，而微观结构取决于材料的成分、加工方法和尺寸。这种微妙的结构-性能关系相当复杂，仍有待探索。在这里，我们通过分子动力学模拟控制制备过程，研究了具有相同成分和尺寸但微观结构存在细微差异的金属玻璃纳米线的微观结构演变与力学性能之间的关系。结果表明，金属玻璃中变形机制的转变存在一个结构阈值：当结构特征超过该阈值时，变形从均匀流动转变为剪切局部化变形。
