An improved method to model dislocation self-climb

graphic of the self climb observed in the experiment

Dr Fengxian Liu, Professor Alan Cocks and Professor Edmund Tarleton have worked with Dr Gill of the University of Leicester to develop their model for self-climb (atoms using diffusion paths due to dislocation), by employing a new finite element discretisation method.


The speed-up in computation enables them to use the self-climb model as an effective numerical technique to simulate emergent dislocation behaviour involving both self-climb and glide.  The formation of prismatic loops from the break-up of different types of edge dislocation dipoles were investigated based on this new method. 


Their paper 'An improved method to model dislocation self-climb' is published by Modelling and Simulation in Materials Science and Engineering, and demonstrates that edge dipoles sequentially pinch-off prismatic loops, rather than spontaneously break into a string of loops, to rapidly decrease the total dislocation energy.