Solute strengthening of twinning dislocations in Mg alloys

Solute strengthening of twin dislocation motion along an existing twin boundary in Mg–X (X = Al, Zn) is investigated using a new Labusch-type weak pinning model. First, the (101¯2) twinning dislocation structure is computed using first-principles methods. Second, the interaction energies of Al and Zn solutes with the twin boundary and twin dislocation are computed. It is shown that the interaction energies of Zn solutes scale with the Al solute...