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Solution softening in magnesium alloys; The Effect of solid solutions on the dislocation core structure and nonbasal slip

Tsuru, Tomohito; Udagawa, Yutaka; Yamaguchi, Masatake  ; Itakura, Mitsuhiro; Kaburaki, Hideo; Kaji, Yoshiyuki

There is a pressing need to improve the ductility of magnesium alloy toward the advanced application for light-weight structural materials. In this letter we focused attention on the particular potential function for yttrium to activate the non-basal slip. The generalized stacking fault (GSF) energies of both basal and prismatic planes for pure magnesium are calculated by density functional theory (DFT) and EAM potential, and its effect on the dislocation core structures are examined by semidiscrete variation Peierls Nabarro (SVPN) model. Solution softening of added yttrium was similarly estimated by combination of DFT and SVPN model. Yttrium was found to have a particular influence on solution softening by the reduction of the gradient of the GSF energy.

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Category:Physics, Condensed Matter

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