Performance Analysis of Friction Stir Joint Zone for AZ80 M Magnesium Alloy
A friction stir joining experiment was conducted using 4mm thick AZ80M magnesium alloy.The rotation speed of the stirring head was fixed at 1000rpm,and the advancing speeds were set at 150mm/min,200mm/min,and 250mm/min.The microstructure,tensile strength,microhardness,and corrosion resistance of the samples obtained under these parameters were analyzed.The results showed that the joints obtained under these parameters had good macroscopic morphology with no tunnels or holes.There was a refinement of grains in the jointed zone.The sample obtained at an advancing speed of 150mm/min had larger grain size.The highest tensile strength of the samples could reach up to 90.92%of the base material,with the tensile fracture occurring in the heat-affected zone and the fracture mode being a mixture of ductile and brittle fracture.The sample obtained at an advancing speed of 200mm/min had the lowest self-corrosion current density and the best corrosion resistance.
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