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

InvestigatorMgr. Jan Fikar, Ph.D.
Number of Project16-24402S
AgencyGrantová agentura České republiky
Duration2015-12-31 - 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.


Fikar J., Schäublin R.: Stability of small vacancy clusters in tungsten by molecular dynamics. Nucl. Instr. Meth. Phys. Res. B 464 (2020) 56-59


Fikar J., Schäublin R., Mason D., Nguyen-Manh D.: Nano-sized prismatic vacancy dislocation loops and vacancy clusters in tungsten. Nucl. Mater. Energy 16 (2018) 60-65


Fikar J., Gröger R., Schäublin R.: Interaction of irradiation-induced prismatic dislocation loops with free surfaces in tungsten. Nucl. Instr. Meth. Phys. Res. B 393 (2017) 186-189

Fikar J., Gröger R., Schäublin R.: Effect of orientation of prismatic dislocation loops on interaction with free surfaces in BCC iron. J. Nucl. Mater. 497 (2017) 161-165


Fikar J., Gröger R.: Shape of small prismatic dislocation loops in tungsten and iron. Solid State Phenom. 258 (2016) 97-101