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In an effort to establish a scientific foundation for the computational development of advanced Mg-based alloys, a systematic study of the generalized stacking fault (GSF) energy curves has been undertaken. Additionally, the associated stable and unstable stacking and twinning fault energies, ideal shear strengths, and comparative twinnability have been investigated in terms of first-principles calculations for dilute Mg-based alloys of type Mg 95 X. These GSF properties are predicted using the simple and especially the pure alias shear deformations on the basal (0 0 0 1) plane and along the [1 0 1¯ 0] direction of the hexagonal close-packed (hcp) lattice. Fourteen alloying elements (X) are considered herein, namely Al, Ca, Cu, La, Li, Mn, Sc, Si, Sn, Sr, Ti, Y, Zn and Zr. The following conclusions are obtained:(i) the fault energies and the ideal shear strengths of Mg 95 X alloys decrease approximately linearly with an …