The microstructural evolution and mechanical properties of AZ31 magnesium alloy processed by the interactive alternating forward extrusion at different loading displacements(h=3,6,9 mm)were investigated.Optical micros...The microstructural evolution and mechanical properties of AZ31 magnesium alloy processed by the interactive alternating forward extrusion at different loading displacements(h=3,6,9 mm)were investigated.Optical microscopy(OM)and electron backscatter diffraction(EBSD)were used to analyze the evolution of microstructure,and the mechanical behavior was clarified by tensile tests and scanning electron microscopy(SEM).The results show that continuous dynamic recrystallization(CDRX)and discontinuous dynamic recrystallization(DDRX)can achieve grain refinement jointly in interactive alternating forward extrusion.With the decrease of the loading displacement h,the proportion of recrystallization increases from 23.4%to 66.7%.The fiber texture gradually tilts to the extrusion direction(ED),and the grain orientation randomization of DDRX further weakens the fiber texture intensity.When h=3 mm,the ultimate tensile strength(UTS)is 249.1 MPa and the elongation can reach 29.4%.展开更多
Traditional rolled(TR)aluminum(Al)/magnesium(Mg)/aluminum(Al)composite plates have many bottlenecks such as multiple passes,low interlaminar strength,and weak mechanical properties.In this paper,the hard-plate rolling...Traditional rolled(TR)aluminum(Al)/magnesium(Mg)/aluminum(Al)composite plates have many bottlenecks such as multiple passes,low interlaminar strength,and weak mechanical properties.In this paper,the hard-plate rolling(HPR)method was used to prepare Al/Mg/Al composite plates under a single pass reduction of 60%.The results show that the ultimate tensile strength(UTS)of the composite plate obtained by hard-plate rolling is 262.3 MPa,and the percentage of total elongation at fracture(At)is 12.3%,which is 31.6%and 37.4%higher than that of the traditional rolling,respectively.It is attributed to the unique corrugated interlocking structure of the interface of the composite plate caused by hard-plate rolling.The shear texture produced by the Mg plate weakens the strong-basal texture.At the same time,the strong basal slip and the large amount of energy stored in the deformed grains provide favorable conditions for dynamic recrystallized(DRX)nucleation.The microstructure is deeply refined by DRX,and the strength and plasticity of the composite plate are improved synchronously.It provides scientific guidance for the development of high-performance lightweight composite plates and the research on hard-plate rolling technology and also has good industrial production and application potential.展开更多
基金supported by the National Natural Science Foundation of China (No.51975166)。
文摘The microstructural evolution and mechanical properties of AZ31 magnesium alloy processed by the interactive alternating forward extrusion at different loading displacements(h=3,6,9 mm)were investigated.Optical microscopy(OM)and electron backscatter diffraction(EBSD)were used to analyze the evolution of microstructure,and the mechanical behavior was clarified by tensile tests and scanning electron microscopy(SEM).The results show that continuous dynamic recrystallization(CDRX)and discontinuous dynamic recrystallization(DDRX)can achieve grain refinement jointly in interactive alternating forward extrusion.With the decrease of the loading displacement h,the proportion of recrystallization increases from 23.4%to 66.7%.The fiber texture gradually tilts to the extrusion direction(ED),and the grain orientation randomization of DDRX further weakens the fiber texture intensity.When h=3 mm,the ultimate tensile strength(UTS)is 249.1 MPa and the elongation can reach 29.4%.
基金supported by the Key Laboratory of Micro-systems and Micro-structures Manufacturing of Ministry of Education,Harbin Institute of Technology(2020KM005).
文摘Traditional rolled(TR)aluminum(Al)/magnesium(Mg)/aluminum(Al)composite plates have many bottlenecks such as multiple passes,low interlaminar strength,and weak mechanical properties.In this paper,the hard-plate rolling(HPR)method was used to prepare Al/Mg/Al composite plates under a single pass reduction of 60%.The results show that the ultimate tensile strength(UTS)of the composite plate obtained by hard-plate rolling is 262.3 MPa,and the percentage of total elongation at fracture(At)is 12.3%,which is 31.6%and 37.4%higher than that of the traditional rolling,respectively.It is attributed to the unique corrugated interlocking structure of the interface of the composite plate caused by hard-plate rolling.The shear texture produced by the Mg plate weakens the strong-basal texture.At the same time,the strong basal slip and the large amount of energy stored in the deformed grains provide favorable conditions for dynamic recrystallized(DRX)nucleation.The microstructure is deeply refined by DRX,and the strength and plasticity of the composite plate are improved synchronously.It provides scientific guidance for the development of high-performance lightweight composite plates and the research on hard-plate rolling technology and also has good industrial production and application potential.
