Microstructure and mechanical behavior of similar butt-joints of ZK60 and ZK60–1.5RE magnesium alloys produced by linear friction stir welding

The microstructure and mechanical properties of butt-joints produced by linear friction stir welding similar plates as-cast ZK60 modified with 1.5 wt.% RE (ZK60–1.5RE) are investigated. thermomechanical affected zone is investigated in both advancing retrieving sides, the compared to base metal stirred zone. Electron backscattered diffraction measurements provide average microstructural features transformed microstructure. assessed using hardness, tensile testing, surface residual stress measured X-ray diffraction. Higher torque heat input obtained for ZK60–1.5RE ZK60. notably larger ZK60–1.5RE. A gradient formed zones where deformed grains progressively more recrystallised towards There no visible interface between fine partially side has a slightly refined other zones. Anisotropy increment maximum intensity (0001) increases correlated role twinning, recovery, static, dynamic recrystallisation that can occur during welding. Twinning large misorientation spread pronounced regions metal. Sharp low angle grain boundaries observed From decorating zone, mosaic-like high joints have comparable stresses. improved ductility strength alloy since samples fractured BM.