Effect of Mn content on microstructure and deformation mechanism of Mg-1Al alloy
Effect of different Mn contents on microstructure and plastic deformation mechanism of extruded Mg-1Al-xMn(x=1,2 and 3,mass％)alloy was analyzed by means of tensile test,scanning electron microscopy,electron backscatter diffraction technique and viscoplastic self-consistent(VPSC)simulation calculations.The results show that as the Mn content increases from 1 mass％to 3 mass％,the strength and plasticity of the extruded Mg-1Al alloy are synchronously improved.Among them,the Mg-3Mn-1Al alloy exhibits good mechanical properties,with tensile yield strength,ultimate tensile strength and elongation of 302 MPa,325 MPa and 21％respectively.With the increase of Mn content,the number of the second phase in the extruded Mg-1Al alloy significantly increases,and it is distributed in a strip shape along the extrusion direction.The grain size of the Mg-3Mn-1Al alloy is the smallest,with obvious mixed crystal structure,and the average grain size is 1.31 μm.The VPSC simulation results show that adding Mn element to the Mg-1Al alloy can effectively suppress the initiation of basal<a>slip,which is beneficial for promoting the activation of pyramid<c+a>slip system.The initiation of non basal slip can effectively coordinate strain,thereby improving the plastic deformation ability of the alloy,and ultimately achieving synchronous improvement of strength and plasticity.
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万方数据
维普
