物理学报2011，Vol.60Issue(9)：493-499,7.
基于点缺陷扩散理论与离散位错动力学耦合的位错攀移模型研究
Dislocation climb model based on coupling the diffusion theory of point defects with discrete dislocation dynamics
摘要
Abstract
Dislocation climb plays a vital role in the plastic behavior of crystals at high temperatures. In order to reveal the intrinsic mechanism of climb and its effect on plasticity, a new dislocation climb model is first developed based on the combination of the diffusion theory with both bulk diffusion and pipe diffusion in a three-dimensional discrete dislocation dynamics （DDD） simulation, which is considered to be more physical and widely applicable. Using our model the shrinkage processes of a single prismatic loop group and prismatic loop group are simulated. It is concluded that the climb rate is not directly determined by mechanical climb force as believed in classical theories, but by the gradient of the vacancy concentration around （bulk diffusion） and along （pipe diffusion） the dislocation line. Loop coarsening process is also simulated, and the three pronounced evolving stages of the loop radii and the average vacancy concentrations in crystal are reproduced.关键词
位错攀移/点缺陷扩散理论/位错动力学/棱柱位错环Key words
dislocation climb/diffusion theory of point defects/dislocation dynamics/prismatic dislocation loop分类
矿业与冶金引用本文复制引用
高原,柳占立,赵雪川,张朝晖,庄茁,由小川..基于点缺陷扩散理论与离散位错动力学耦合的位错攀移模型研究[J].物理学报,2011,60(9):493-499,7.基金项目
国家自然科学基金（批准号：10772096）资助的课题 （）
