Institute of Physics of Materials AS CR, v. v. i. > Projects > Interaction of prismatic dislocation loops in alpha iron and tungsten
Interaction of prismatic dislocation loops in alpha iron and tungsten
|Mgr. Jan Fikar, Ph.D.
|Number of Project
|Grantová agentura České republiky
|2015-12-31 - 2018-12-30
|The prismatic loops appear in metals as a result of high-energy irradiation or plastic deformation. Understanding of the loop formation and interaction is important for quantification of irradiation=induced deterioration in mechanical properties. Transmission electron microscopy (TEM) observation of dislocation loops in thin foils is commonly used, however, the results are inevitably influenced by the proximity of the free surfaces. The prismatic loops are attracted to the free surfaces by the image forces and depending on their type, size and depth in a foil can escape via the free surface causing inaccurate TEM observations and conclusions. Therefore it is necessary to quantify the effects induced by the free surfaces. There exist two theoretical elastic solutions for isotropic materials and Burgers vector exactly perpendicular to the free surface. In this project we intend to generalize and verify these solutions using atomistic simulations and TEM experiments.