Breaks of dose dependence of transient creep as result of competing influence of defects' fluxes on climb of dislocations

International Scientific Conference on "Radiation-Thermal Effects and Processes in Inorganic Materials"

材料科学;物理学

Selyshchev, P.^1

Department of Physics, University of Pretoria, South Africa^1

关键词: Climb of dislocations;    Creep rates;    Dose dependences;    Initial state;    Theoretical approach;    Thermal fluxes;    Transient creeps;    Vacancy flux;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/81/1/012126/pdf
DOI  :  10.1088/1757-899X/81/1/012126

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

In the framework of climb-glide model a theoretical approach is developed to describe transient creep under irradiation. It is obtained the explicit expression for creep rate which describes experimentally observed breaks of dose dependence of creep. It is shown that the breaks arise as result of competition of radiation and thermal fluxes of defects to dislocation. When interstitial and vacancy fluxes become equal, the dislocation cannot overcome the obstacle via climbing and cannot continue glide. Climb-glide mechanism does not contribute to the creep. The creep rate drops. Numbers of breaks depend on initial state of material and conditions of irradiation. Dose (time) of break appearance are obtained.