Microstructural and mechanical behavior of friction stir welded AZ31-AZ61 magnesium alloys dissimilar joint
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Abstract
In this work, the effect of high tool rotation speed (ω) and forward velocity (V) in dissimilar friction stir welding (FSW) of AZ31-AZ61 magnesium alloys thin plates on microstructural and mechanical properties was studied. The results reveal a continuous dynamic recrystallization and grain refinement in the stir zone (SZ) with formation of precipitates particles Al8Mn5 and some undissolved intergranular compounds β-Al12Mg17. Also, the microstructures of both thermo-mechanically affected zones TMAZAZ31 and TMAZAZ61 consist of elongated restored grains generally coarser than those found in SZ. The heat affected zone (HAZ) exhibits the same grains appearance as those of base metals (BMs). The stir zone displays the highest microhardness with 60 HV and 68 HV for both sides of the weld joint AZ31 and AZ61, respectively. The ultimate tensile strength (UTS) of the welded joint improves, reaching values of 75.77% for AZ31 base materials and 63.55% for AZ61 base materials.
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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
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