轧制变形对建筑用Al-Mn合金组织与性能的影响
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摘要
采用累积叠轧工艺制备了1 mm厚的Al-Mn和Al-Mn-Er-Zr合金,研究了累积叠轧道次对Al-Mn和Al-Mn-Er-Zr合金显微组织、拉伸性能、显微硬度和微观结构的影响,分析了累积叠轧和微量元素Er、Zr的作用机理。结果表明:随着累积叠轧道次的增加,Al-Mn和Al-Mn-Er-Zr合金板的界面结合数不断增加,界面结合质量有所提高,且相同累积叠轧道次下Al-Mn-Er-Zr合金板的界面结合质量更好;累积叠轧后Al-Mn和Al-Mn-Er-Zr合金板的强度相较于叠轧前有所提高,断后伸长率有所减小,而随着累积叠轧道次增加,强度和硬度不断增大而塑性变化较小;在相同的叠轧道次下,Al-Mn-Er-Zr合金的强度和硬度都要高于Al-Mn合金; Al-Mn和Al-Mn-Er-Zr合金叠轧后都会在形变区域形成亚晶和位错胞,且随着累积叠轧道次的增加,位错胞会逐渐转变为细小晶粒;相同叠轧道次下Al-Mn-Er-Zr合金中位错和亚晶密度会更高,这与Al-Mn-Er-Zr合金中形成了细小的钉扎位错和晶界的颗粒状Al3Er相有关。
Al-Mn and Al-Mn-Er-Zr alloys with thickness of 1 mm were prepared by accumulative overlapping rolling process. Then,the influences of accumulative overlapping rolling passes on microstructure,tensile properties,microhardness and microstructure of Al-Mn and Al-Mn-Er-Zr alloys were studied,and the mechanism of accumulative overlapping rolling and Er and Zr trace elements was analyzed. The results show that the interfacial bonding number and quality of Al-Mn and Al-Mn-Er-Zr alloy sheets increase with the increasing of accumulative overlapping rolling passes,and the interfacial bonding quality of Al-Mn-Er-Zr alloy sheet is better under the same accumulative overlapping rolling passes. The strength of Al-Mn and Al-Mn-Er-Zr alloy sheets after accumulative overlapping rolling is higher than that of before,however,the elongation after break decreases. With the increasing of rolling passes,the strength and hardness increase,and the plasticity changes slightly. Under the same rolling passes,the strength and hardness of Al-Mn-Er-Zr alloy are higher than that of Al-Mn alloy. Furthermore,Al-Mn and Al-Mn-Er-Zr alloys form subgrains and dislocation cells in the deformation region after rolling,and the dislocation cells gradually change into fine grains with the increasing of accumulative overlapping rolling passes. Therefore,the dislocation and subgrain density are higher in Al-Mn-Er-Zr alloy under the same accumulative overlapping rolling passes,which is related to the formation of fine pinned dislocations and grain boundary Al3 Er phase in Al-Mn-Er-Zr alloy.
Al-Mn and Al-Mn-Er-Zr alloys with thickness of 1 mm were prepared by accumulative overlapping rolling process. Then,the influences of accumulative overlapping rolling passes on microstructure,tensile properties,microhardness and microstructure of Al-Mn and Al-Mn-Er-Zr alloys were studied,and the mechanism of accumulative overlapping rolling and Er and Zr trace elements was analyzed. The results show that the interfacial bonding number and quality of Al-Mn and Al-Mn-Er-Zr alloy sheets increase with the increasing of accumulative overlapping rolling passes,and the interfacial bonding quality of Al-Mn-Er-Zr alloy sheet is better under the same accumulative overlapping rolling passes. The strength of Al-Mn and Al-Mn-Er-Zr alloy sheets after accumulative overlapping rolling is higher than that of before,however,the elongation after break decreases. With the increasing of rolling passes,the strength and hardness increase,and the plasticity changes slightly. Under the same rolling passes,the strength and hardness of Al-Mn-Er-Zr alloy are higher than that of Al-Mn alloy. Furthermore,Al-Mn and Al-Mn-Er-Zr alloys form subgrains and dislocation cells in the deformation region after rolling,and the dislocation cells gradually change into fine grains with the increasing of accumulative overlapping rolling passes. Therefore,the dislocation and subgrain density are higher in Al-Mn-Er-Zr alloy under the same accumulative overlapping rolling passes,which is related to the formation of fine pinned dislocations and grain boundary Al3 Er phase in Al-Mn-Er-Zr alloy.
引文
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[3]Wu K,Chang H,Maawad E,et al.Microstructure and mechanical properties of the Mg/Al laminated composite fabricated by accumulative roll bonding(ARB)[J].Materials Science&Engineering A,2010,527(13):3073-3078.
[4]张璞.形变热处理对屋面用Al-Mn合金板再结晶行为的影响[J].热加工工艺,2018,47(8):138-142.Zhang P.Effect of thermo-mechanical treatment on recrystallization behavior of Al-Mn alloy plate for roofing[J].Hot Working Technology,2018,47(8):138-142.
[5]Motevalli P D,Eghbali B.Microstructure and mechanical properties of Tri-metal Al/Ti/Mg laminated composite processed by accumulative roll bonding[J].Materials Science&Engineering A,2015,628(3):135-142.
[6]Liu C Y,Wang Q,Jia Y Z,et al.Microstructures and mechanical properties of Mg/Mg and Mg/Al/Mg laminated composites prepared via warm roll bonding[J].Materials Science&Engineering A,2012,556(11):1-8.
[7]Ebrahimi S H S,Dehghani K,Aghazadeh J,et al.Investigation on microstructure and mechanical properties of Al/Al-Zn-Mg-Cu laminated composite fabricated by accumulative roll bonding(ARB)process[J].Materials Science&Engineering A,2018,718(7):15-22.
[8]Davood R,Moslem T,Ramin H,et al.Microstructure and mechanical properties of Al/Cu/Mg laminated composite sheets produced by the ARB proces[J].International Journal of Minerals Metallurgy and Materials,2018,25(5):564-572.
[9]Mashhadi A,Atrian A,Ghalandari L.Mechanical and microstructural investigation of Zn/Sn multilayered composites fabricated by accumulative roll bonding(ARB)process[J].Journal of Alloys&Compounds,2017,727(5):564-572..
[10]Zhang X P,Yang T H,Castagne S,et al.Microstructure,bonding strength and thickness ratio of Al/Mg/Al alloy laminated composites prepared by hot rolling[J].Materials Science&Engineering A,2011,528(4):1954-1960.
[11]Wen S P,Wang W,Zhao W H,et al.Precipitation hardening and recrystallization behavior of Al,Mg,Er,Zr alloys[J].Journal of Alloys&Compounds,2016,687(6):143-151.
[12]Wu H,Wen S P,Huang H,et al.Effects of homogenization on precipitation of Al3(Er,Zr)particles and recrystallization behavior in a new type Al-Zn-Mg-Er-Zr alloy[J].Materials Science&Engineering A,2017,689(7):313-322.
[13]Luca A D,Dunand D C,Seidman D N.Mechanical properties and optimization of the aging of a dilute Al-Sc-Er-Zr-Si alloy with a high Zr/Sc ratio[J].Acta Materialia,2016,119(5):35-42.
[14]He L Z,Li X H,Liu X T,et al.Effects of homogenization on microstructures and properties of a new type Al-Mg-Mn-Zr-Ti-Er alloy[J].Materials Science&Engineering A,2010,527(29):7510-7518.