In this paper, the rolling textures of six magnesium alloys containing different levels of zinc and rare earth (e.g., mischmetal or Y) additions are examined. The overall texture strength and the basal pole intensity aligned with the sheet normal direction is lower for rare earth containing alloys than for conventional alloys. The distinct textures generated in this study allow investigation of the influence of texture on the mechanical response. The anisotropy of the yield and flow strengths is reversed and the planar anisotropy is reduced (r ~ 1) in comparison to conventional alloys. Both aspects of the anisotropy are related to the fact that the dominant texture components in the Mg-Zn-RE alloys place more grains in favourable orientations for basal slip and tensile twinning, particularly during transverse direction tension. Mg sheets with lower r-value promise to have improved forming behaviour, at least under straining conditions which call for thinning of the sheet.

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of the original manuscript: Laser, T.; Nuernberg, M.; Janz, A.; Hartig, C.; Letzig, D.; Schmid-Fetzer, R.; Bormann, R.: a , AbstractCalculated phase diagrams for the Mg-Al-Zn-Mn system indicate that β-Mn(Al) and Al8Mn5 can primarily crystallize during the solidification of Mn modified AZ31. Both phases may act as potential heterogeneous nucleants for magnesium grains and thus as potential grain refiners in the Mg-Al system. In this investigation three Mg-3Al-1Zn alloys with different Mn content are diecast and hot-rolled at 450°C. The influence of the Mn content on the microstructural evolution and mechanical properties after hot-rolling is studied.After casting, β-Mn and Al8Mn5 are present in all three AZ31 alloys without showing significant influence on the grain size. The potential of β-Mn and Al8Mn5 precipitates for grain-refinement in AZ alloys is discussed in detail on the basis of solidification kinetics.

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