Effect of Forward Extrusion Ratio on Microstructure and Mechanical Properties of Mg-4Sn-2Zn-0.5Mn Alloy
The forward extrusion experiment of Mg-4Sn-2Zn-0.5Mn alloy with different extrusion ratios was carried out,and the extruded alloy was aged at 180℃.The effects of forward extrusion and aging treatment on the microstructure and mechanical properties of Mg-4Sn-2Zn-0.5Mn alloy with different extrusion ratios were studied by OM,TEM,tensile test,hardness test and fracture morphology observation.The results show that with the increase of extrusion ratio,the dynamic recrystallization of Mg-4Sn-2Zn-0.5Mn alloy is more and more sufficient,the grain is refined,and the microstructure uniformity is improved gradually.When the extrusion ratio is 25,the dynamic recrystallization of the alloy is complete.With the increase of extrusion ratio,the tensile strength and yield strength of the alloy increase gradually,while the elongation decreases gradually.Aging treatment further improves the hardness and strength of the extruded alloy.With the increase of aging time,the hardness of the extruded alloy increases first and then decreases,and reaches the maximum of 83.7 HV when the alloy is aged for 42 h.Its tensile strength,yield strength and elongation are 382.5 MPa,335.4 MPa and 8.2%,respectively.
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