Mechanism of a High-Temperature Creep of molybdenum and Tungsten monocrystals in Initial and Substructurally-hardened States

摘要

The high-temperature creep rate dependences for molybdenum and tungsten single crystals on the structure factor, stresses and temperatures are studied. The squared dependence of creep rate on the integral substructure-misorientation angle is found. This is valid for both strengthening efficiency by substructure and metal behaviour during a creep. It is shown that, within the whole range of investigated stresses, the creep mechanism at the steady stage is concerned with nonconservative dislocations' motion controlled by diffusion processes with salient features caused by differences in concentration of steps in dislocations