Effect Of Extrusion Times And Y Content On Microstructure And Mechanical Properties Of ZM6Magnesium Alloy Prepared By Solid State Recycling

At present, magnesium alloy is the lightest metal structural materials. It hasmany advantages including low density, good specific strength and stiffness,steady dimension, good machining and excellent damping capacity. But themagnesium alloy has inferior high temperature properties. However, magnesiumalloy waste will increase sharply during producing with application ofmagnesium alloy increasing. In this paper, magnesium alloy prepared by solidstate recycling is investigated, which lead to save energy, reduce gas emissionand achieve continuable development of magnesium industry.In this paper, ZM6heat-resistant magnesium alloy chips and Mg-Y alloychips were prepared by solid state recycling. Microanalysis and test ofmechanical properties were carried out by scanning eletron microscope, opticalmicroscope and electron universal strength testing machine. Composition of thealloy, microstructural evolution, tensile properties and fracture behavior wereinvestigated. Strengthening mechanism and fracture mechanism of the alloy atdifferent conditions were discussed.Effect of extrusion times on the microstructure and test of mechanicalproperties of ZM6magnesium alloy containing6.0%Y prepared by solid staterecycling process were investigated.The results show that Mg-Y intermediatealloy was broken and the Y element was much more evenly distributed in themagnesium alloy with the increase of extrusion times. The grains of themagnesium alloy were refined with the increase of extrusion times. The size ofgrains could reach3.21±0.03μm while the extrusion times was the5th times.Tensile strength and elongation to failure of the alloy were obviously improvedwith the increase of extrusion times. Ultimate tensile strength increased with theextrusion times increasing. Ultimate tensile strength increases from225MPa to 265MPa, and elongation to failure of the alloy increases from4.13%to13.7%with the increase of extrusion times.Effect of Y on microstructures and mechanical properties of ZM6magnesium alloy prepared by solid state recycling was investigated. Inaccordance with proportion Mg-Y master alloy are joined in the ZM6magnesium alloy and formed new alloy with1.5%,3%,4.5%and6%Y.Microstructure are observed and mechanical properties are tested after threetimes extrusion. With the increase of Y content, tensile strength and yieldstrength increased while elongation slightly decreased. Ultimate tensile strengthincreases from220MPa to250MPa, and elongation to failure of the alloydecreases from10.82%to8.18%because of the refined grains.