Modeling of hydrogen diffusion process at a blunt notch in zirconium  

作　　者：Xingqiao Ma Sanqiang Shi Senyang Hu Chungho Woo Longqing Chen 

机构地区：[1]Department of Physics, University of Science and Technology Beijing, Beijing 100083, China [2]Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong, China [3]Department of Materials Science and Engineering, The Pennsylvania State University, University Park PA 16802, USA

出　　处：《Journal of University of Science and Technology Beijing》2005年第5期416-421,共6页北京科技大学学报（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China (No.50428101), the Research GrantsCouncil of Hong Kong (B-Q471), the Hong Kong Polytechnic University (G-V851), and the U.S. National Science Foundation (DMR96-33719)

摘　　要：The two-dimensional diffusion of interstitial hydrogen atoms in zirconium in a non-uniform stress field was simulated using the phase-field method. The interaction between hydrogen interstitials and the stress field was described by Khachaturyan＇s elastic theory. The Cahn-Hilliard diffusion equation was then solved by an explicit finite difference method. The result shows that hydrogen atoms diffuse to the high-tensile hydrostatic region near the tip of the notch. The content of hydrogen near the tip of the notch increases by 13%, while the stress distribution caused by hydrogen interstitials around the notch is modified by only 0.7%.The two-dimensional diffusion of interstitial hydrogen atoms in zirconium in a non-uniform stress field was simulated using the phase-field method. The interaction between hydrogen interstitials and the stress field was described by Khachaturyan＇s elastic theory. The Cahn-Hilliard diffusion equation was then solved by an explicit finite difference method. The result shows that hydrogen atoms diffuse to the high-tensile hydrostatic region near the tip of the notch. The content of hydrogen near the tip of the notch increases by 13%, while the stress distribution caused by hydrogen interstitials around the notch is modified by only 0.7%.

关 键 词：PHASE-FIELD HYDROGEN diffusion non-uniform applied stress ZIRCONIUM 

分 类 号：O562[理学—原子与分子物理]