Aging Hardening Behavior Of Extruded Mg-Gd-Zr Series Alloys And Its Texture Evolution During Annealing

With the development and application of high strength magnesium alloys, theaging hardening behavior, mechanical properties and the microstructure evolutionduring processing and annealing in rare-earth magnesium alloys have received more andmore attention. Based on this background, this work investigates following two parts.Part1: the effect of pre-deformation on the aging characteristics and mechanicalproperties of extruded Mg-Gd-Ag-Zr alloy, and investigated the texture evolution of theextruded Mg-Gd-Zr alloy at different annealing temperature. The primary conclusionsare as follows:①The extruded sample reached aging peak at48h, while the age-hardeningresponse of10%pre-deformed sample was remarkably accelerated, it reached agingpeak at28h.②Compared to the extruded Mg-Gd-Ag-Zr alloy, the he yield strength and tensilestrength of the pre-deformed one were enhanced.③Compared to the undeformed samples, when predeformed perpendicular toextruded direction, the tensile strength of peak-aged Mg-Gd-Ag-Zr alloy at200℃areimproved; while predeformed parellel to extruded direction, the tensile strength ofpeak-aged Mg-Gd-Ag-Zr alloy at200℃are worse.④During annealing at450℃for20min to60min, the<0001>//ED texture wasformed. And the the intensity of this type of texture was increased with annealing time.After annealing at500℃, the <0001>//ED texture and the <11-20>//ED texture wereformed. During annealing at500℃for20min to60min,the intensity of<11-20>//ED texture was increased with annealing time.