Study on the microstructure and properties of surface modification by FSP+laser remelting on AZ31 magnesium alloy
In order to explore the effects of scanning speed on the microstructure,mechanical properties,and corrosion resistance of FSP(Friction Stir Processing)+laser remelted AZ31 magnesium alloy composite modifications,instruments such as a stereoscope,confocal microscope,X-ray diffractometer,Vickers hardness tester,and electrochemical workstation were utilized to study the samples at different scanning speeds.The results indicate that as the scanning speed increases,the macroscopic morphology becomes smoother,the grain size is refined,and the content of the β-phase decreases.When the scanning speed is increased from 1200 mm/min to 1800 mm/min,the microhardness of both the solidified zone and the heat-affected zone increases and is higher than that of the FSP-AZ31 sample.At a speed of 1800 mm/min,the microhardness of the solidified zone reaches a maximum of 71.62 HV,which is a 23.82％increase compared to FSP-AZ31.As the scanning speed increases,the corrosion resistance of the modified samples gradually strengthens,with the sample at 1800 mm/min having the lowest corrosion current density of 2.15×10-4 A/cm2,although it is higher than the corrosion current density of FSP-AZ31.
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