Year: 2020
Type: article
Abstract: Elucidating the interplay of defects and stress at the microscopic level is a fundamental physical problem that has a strong connection with materials science. Here, based on the two-dimensional crystal model, we show that the instability mode of vacancies with varying size and morphology conforms to a common scenario. A vacancy under compression is fissioned into a pair of dislocations that glide and vanish at the boundary. This neat process is triggered by the local shear stress around the vacancy. The remarkable fractionalization of vacancies creates rich modes of interaction between vacancies and other topological defects, and provides a new dimension for mechanical engineering of defects in extensive crystalline structures.
Source: Soft Matter
DOI: 10.1039/d0sm00205d
Author: Zhenwei Yao
Institutions: Shanghai Jiao Tong University, Institute of Natural Sciences
Language: English
Subfield: Metals and Alloys
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
Awards: G6908301923, G7337869721
OpenAlex ID: W3033246953