Investigating effect of recrystallization mechanism on deformation mode and texture evolution is conducive to controlling deformation mechanism and texture in magnesium alloys under medium-high temperature impact load...Investigating effect of recrystallization mechanism on deformation mode and texture evolution is conducive to controlling deformation mechanism and texture in magnesium alloys under medium-high temperature impact loading.In the present study,a Johnson-Cook model incorporating twin strengthening was established to simulate macro-deformation,and a twinning induced recrystallization(TDRX)model and bulging recrystallization(GBBDRX)model are introduced into visco-plastic self consistant(VPSC)framework to quantitatively study the deformation mechanism of pre-twinned AZ31 magnesium alloy during medium-high temperature impact loading.Both TDRX and GBBDRX occur,with basal slip as the dominant slip system,followed by pyramidal〈c+a〉slip and prismatic slip.The dynamic recrystallization(DRX)significantly influences basal and pyramidal〈c+a〉slip systems,with minimal impact on secondary deformation mechanism.In addition,the recrystallization mechanism of grain boundary bowing increases the activity of basal slip and decreases the activity of pyramidal〈c+a〉slip.The nucleation and growth of recrystallized grains enhance basal slip activity and suppress pyramidal〈c+a〉slip,leading to the formation of a strong basal texture.As dynamic recrystallization progresses,a bimodal texture develops,characterized by a reduction in basal component pole density and a more pronounced basal slip.展开更多
This study produced wide(900-1200 mm)AZ31 alloy sheets with varying thicknesses via continuous casting direct rolling(7 mm,6 mm)combined with stepwise warm rolling(4.5 mm,2 mm),examining the effects of this process on...This study produced wide(900-1200 mm)AZ31 alloy sheets with varying thicknesses via continuous casting direct rolling(7 mm,6 mm)combined with stepwise warm rolling(4.5 mm,2 mm),examining the effects of this process on microstructure,corrosion durability,mechanical properties,and discharge properties.Results showed that the reduced thickness significantly refined the grain size from 131.20µm to 7.90µm with the basal texture intensity reached 52%.Synergistic grain refinement,dislocation,and texture strengthening improved the yield strength(YS),ultimate tensile strength(UTS),and elongation(EL)of the 2 mm-thick sheet by 59.11%,39.75%,and 83.52%,respectively,compared to those of the 7 mm-thick sheet.Corrosion durability was also improved,with a corrosion rate of 2.19 mm·y^(-1)for the 2 mm sheet,which was 41%lower than that of the 7 mm sheet(3.72 mm·y^(-1)),due to the formation of a dense Al(OH)3 and layered double hydroxide corrosion film with mitigated micro-galvanic corrosion.As an Mg-air battery anode,the 2 mm sheet performed the best at 10 mA/cm^(2),achieving an anode efficiency of 61.18%,specific energy of 1660.50 mWh·g^(-1),easy discharge product detachment,and reduced self-corrosion.In summary,this study demonstrates a cost-effective and industrially viable approach that combines continuous casting direct rolling with stepwise warm rolling to produce ultra-wide AZ31 sheets with simultaneously improved overall properties,offering a novel strategy to expand the opportunity for commercial Mg alloys in both structural and functional applications.展开更多
This work investigates the effects of deformation mechanisms on the mechanical properties and anisotropy of rolled AZ31B magnesium alloy under uniaxial tension,combining experimental characterization with Visco-Plasti...This work investigates the effects of deformation mechanisms on the mechanical properties and anisotropy of rolled AZ31B magnesium alloy under uniaxial tension,combining experimental characterization with Visco-Plastic Self Consistent(VPSC)modeling.The research focuses particularly on anisotropic mechanical responses along transverse direction(TD)and rolling direction(RD).Experimental measurements and computational simulations consistently demonstrate that prismaticslip activation significantly reduces the strain hardening rate during the initial stage of tensile deformation.By suppressing the activation of specific deformation mechanisms along RD and TD,the tensile mechanical behavior of the magnesium alloy was further investigated.The results show that basalslip has the greatest impact during the initial deformation stage and basalslip activation substantially affects the deformation behavior of AZ31B alloy,causing marked decreases in both yield and tensile strength along RD.Under tensile loading along TD,prismaticslip not only exhibits a synergistic effect on yield strength,but also dominants work hardening during the initial plastic deformation.展开更多
基金supported by the National Natural Science Foundation of China(52471132,52475356,12272192,52475344,U21A20130)the Natural Science Foundation of Fujian Province for Distinguished Young Scholars(2024J010031)as well as the Natural Science Foundation of Chongqing(grant number CSTB2023NSCQ-MSX0886).
文摘Investigating effect of recrystallization mechanism on deformation mode and texture evolution is conducive to controlling deformation mechanism and texture in magnesium alloys under medium-high temperature impact loading.In the present study,a Johnson-Cook model incorporating twin strengthening was established to simulate macro-deformation,and a twinning induced recrystallization(TDRX)model and bulging recrystallization(GBBDRX)model are introduced into visco-plastic self consistant(VPSC)framework to quantitatively study the deformation mechanism of pre-twinned AZ31 magnesium alloy during medium-high temperature impact loading.Both TDRX and GBBDRX occur,with basal slip as the dominant slip system,followed by pyramidal〈c+a〉slip and prismatic slip.The dynamic recrystallization(DRX)significantly influences basal and pyramidal〈c+a〉slip systems,with minimal impact on secondary deformation mechanism.In addition,the recrystallization mechanism of grain boundary bowing increases the activity of basal slip and decreases the activity of pyramidal〈c+a〉slip.The nucleation and growth of recrystallized grains enhance basal slip activity and suppress pyramidal〈c+a〉slip,leading to the formation of a strong basal texture.As dynamic recrystallization progresses,a bimodal texture develops,characterized by a reduction in basal component pole density and a more pronounced basal slip.
基金funded by the National Natural Science Foundation of China(No.52204407,No.22208220,No.52304408,No.52304398)the Zhejiang Provincial Natural Science Foundation of China(No.LQN25E010012)the Key Industrial Technology Research and Basic public welfare program projects in Shaoxing city(2023B41003,2023A11004 and 2023A11005).
文摘This study produced wide(900-1200 mm)AZ31 alloy sheets with varying thicknesses via continuous casting direct rolling(7 mm,6 mm)combined with stepwise warm rolling(4.5 mm,2 mm),examining the effects of this process on microstructure,corrosion durability,mechanical properties,and discharge properties.Results showed that the reduced thickness significantly refined the grain size from 131.20µm to 7.90µm with the basal texture intensity reached 52%.Synergistic grain refinement,dislocation,and texture strengthening improved the yield strength(YS),ultimate tensile strength(UTS),and elongation(EL)of the 2 mm-thick sheet by 59.11%,39.75%,and 83.52%,respectively,compared to those of the 7 mm-thick sheet.Corrosion durability was also improved,with a corrosion rate of 2.19 mm·y^(-1)for the 2 mm sheet,which was 41%lower than that of the 7 mm sheet(3.72 mm·y^(-1)),due to the formation of a dense Al(OH)3 and layered double hydroxide corrosion film with mitigated micro-galvanic corrosion.As an Mg-air battery anode,the 2 mm sheet performed the best at 10 mA/cm^(2),achieving an anode efficiency of 61.18%,specific energy of 1660.50 mWh·g^(-1),easy discharge product detachment,and reduced self-corrosion.In summary,this study demonstrates a cost-effective and industrially viable approach that combines continuous casting direct rolling with stepwise warm rolling to produce ultra-wide AZ31 sheets with simultaneously improved overall properties,offering a novel strategy to expand the opportunity for commercial Mg alloys in both structural and functional applications.
基金supported by the National Nature Science Foundation of China(52275356).
文摘This work investigates the effects of deformation mechanisms on the mechanical properties and anisotropy of rolled AZ31B magnesium alloy under uniaxial tension,combining experimental characterization with Visco-Plastic Self Consistent(VPSC)modeling.The research focuses particularly on anisotropic mechanical responses along transverse direction(TD)and rolling direction(RD).Experimental measurements and computational simulations consistently demonstrate that prismaticslip activation significantly reduces the strain hardening rate during the initial stage of tensile deformation.By suppressing the activation of specific deformation mechanisms along RD and TD,the tensile mechanical behavior of the magnesium alloy was further investigated.The results show that basalslip has the greatest impact during the initial deformation stage and basalslip activation substantially affects the deformation behavior of AZ31B alloy,causing marked decreases in both yield and tensile strength along RD.Under tensile loading along TD,prismaticslip not only exhibits a synergistic effect on yield strength,but also dominants work hardening during the initial plastic deformation.
