A diffusion model for solute atoms diffusing and aggregating in nuclear structural materials

作     者：宋泉 孟繁新 宁博元 庄军 宁西京 

作者机构：Institute of Modern Physics Fudan University Shanghai 200433 China Applied Ion Beam Physics Laboratory Fudan University Shanghai 200433 China China ZhenHua Group YongGuang Electronics Co. Ltd. (State-owned 873 Factory) Guiyang 550018 China Department of Optical Science and Engineering Fudan University Shanghai 200433 China 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2017年第26卷第12期

页      面：432-438页

核心收录：

学科分类：08[工学] 0827[工学-核科学与技术] 082701[工学-核能科学与工程] 

基　　金：Project supported by the Specialized Research Fund for the Doctoral Program of Higher Education,China(Grant No.20130071110018) the National Natural Science Foundation of China(Grant No.11274073) 

主　　题：atomistic modeling diffusion growth metal tritides nucleation and growth helium bubble 

摘      要：In nuclear structural materials, the nuclear irradiations induce the precipitations of soluble elements or produce the insoluble elements such as He atoms that may form clusters, heavily shortening the service life-times of the materials. In the present work, a diffusion model is developed to predict where and how fast the solute atoms （either soluble or insoluble） aggregate, and this model is applied to the study of the formation and growth of He bubbles in metal tritides （PdT0.6, ErT2, NbT0.0225, VT0.5, TaT0.097, TiT1.5, ZrT1.6） within one thousand days. The results are in good agreement with the available experimental observations and suggest that searching for metals with a barrier of more than 1.1 eV for a single He atom diffusion and making more defects in metal tritides can significantly reduce the growth of He bubbles and extend the service time of the metals.