Micromechanics mechanism of α-Fe with different types of edge dislocations under radiation damage

摘要

Graphical abstractTwo α-Fe models without and with dislocations, A and B model respectively, as well as stress-strain curves of these models and corresponding evolution features of He atoms and dislocations.Display OmittedHighlights•Micromechanics behaviors are tailored by pressure release of He clusters and He bubbles coalescence.•The exist of dislocations in models can reduce yield stress and strain.•Dislocations consolidation accelerates the growth of larger He bubbles.AbstractMicromechanics mechanism of two α-Fe models with and without a/2〈111〉{110} edge dislocations is investigated under a constant strain rate of 109s−1at 800K with 0.1at.% He by molecular dynamics simulations. The results show that micromechanics behaviors are tailored by pressure release of He clusters and subsequent He bubbles coalescence. Furthermore, it is interested to notice that yield stress and strain of the model with dislocations is 0.06 and 10.52GPa, which is lower than that of the model without dislocations (0.105 and 11.77GPa), respectively. The reason for the acceleration is attributed to the consolidation of positive and negative edge dislocations, which induces the nucleation and growth of larger He bubbles.