Study on microstructure evolution and deformation mechanism of hot extruded Mg-1Gd-0.75Er-0.5Zn-0.18Zr magnesium alloy
Taking Mg-1Gd-0.75Er-0.5Zn-0.18Zr as the object,the effects of homogenization annealing on the microstructure,and hot extrusion on the texture and mechanical properties of the alloy were studied.The mi-crostructure analysis shows that after homogenization at 500℃for 12 h,compared with the as cast alloy,the massive LPSO phase precipitated along the grain boundary is significantly reduced,and part of the massive LPSO phase is transformed into lamellar LPSO phase.After hot extrusion,the LPSO phase in the alloy will undergo kink deformation to adapt to the deformation.The dynamic recrystallization mechanism is continuous dynamic re-crystallization mechanism and PSN mechanism.The tensile strength,yield strength and elongation after fracture of the extruded alloy are 340 MPa,308 MPa and 4.64%respectively.The improvement of mechanical properties is mainly attributed to the existence of strong fiber texture.
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