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The interaction of vacancy with dislocations in Al is studied using theSemidiscrete Variational Peierls-Nabarro model with ab initio determined gammasurface. For the first time, we confirm theoretically the so-called vacancylubrication effect on dislocation motion in Al, a discovery that can settle along-standing controversy in dislocation theory for fcc metals. We provideinsights on the lubrication effect by exploring the connection betweendislocation mobility and its core width. We predict an increased dislocationsplitting in the presence of vacancy. We find that on average there is a weakrepulsion between vacancies and dislocations which is independent ofdislocation character.Comment: 6 pages, 2 figure

Can Vacancies Lubricate Dislocation Motion in Aluminum?