原子与分子物理学报2012，Vol.29Issue(1)：113-117,5.DOI:10.3969/j.issn.1000-0364.2012.01.020
Fe中〈100〉{010}刃位错芯结构的各向异性修正
The anisotropic modification to the core structure and Peierls stress of the 〈100〉 {010} edge dislocation in Fe
摘要
Abstract
Based on the dislocation lattice theory, the core structure and the Peierls stress of the <100> {010} edge dislocation in Fe have been determined by using the modified Peierls-Nabarro (P-N) equation in the elastically anisotropic approximation. The expressions of the lattice discrete effect and the shear modulus as well as the energy coefficient have been given explicitly. Among the three factors of anisotropy, and the lattice discrete effect and the energy coefficient can make the core width narrowed, the shear modulus can make the core width widened. Compared with the result in the isotropic approximation, the core width is nearly narrowed by 20 percent by the anisotropy, and the core width in the anisotropic approximation is still in agreement with the numerical simulations. Moreover, the Peierls stress of the dislocation is nearly doubled by the anisotropy, and the order of the magnitude of the Peierls stress is changed from Mpa to Gpa, and all these will affect the movement mechanism of the dislocation significantly. Therefore, the anisotropy is very crucial to the dislocation, and it should be considered indetermining the core structure and the movement mechanism of the dislocation.关键词
位错/芯结构/Peierls应力/弹性各向异性Key words
dislocation/ core structure/ Peierls stress/ the elastic anisotropy分类
数理科学引用本文复制引用
刘瑞萍,鲁胜强,王锐..Fe中〈100〉{010}刃位错芯结构的各向异性修正[J].原子与分子物理学报,2012,29(1):113-117,5.基金项目
国家自然科学基金(11074313) （11074313）
