A modified model on solute alloying element effect in Al–Mg alloys: Mechanical properties and dislocation density evolutions

A modified dislocation based model is introduced to explain the flow stress of Al–Mg alloys at different temperatures and strain rates considering solute alloying element concentration. The solute effect on flow stress is studied on the basis of storage and annihilation of dislocation. It is studied that how the increase of solute content can postpone the dislocation annihilation and how this can affect the storage phenomenon. It is found that the increasing of solute concentration can postpone the beginning of dislocation annihilation through deformation and also increase the critical strain that plateau occurs in plot of annihilation of dislocation versus shear strain. Thus, the plateau level gets higher value and a better strength improvement occurs.