累积叠轧焊温度对AZ31镁合金板材组织与性能的影响
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摘要
目的研究叠轧温度对AZ31镁合金板材组织与性能的影响。方法在450℃和550℃下,对AZ31镁合金板材进行2道次叠轧,研究不同温度下板材界面裂纹的金相组织、RD-ND面晶体取向、力学性能以及断面形貌的异同。结果 450℃累积叠轧制备的ARB2镁合金板材室温断裂伸长率为2.3%,550℃累积叠轧制备的ARB2镁合金板材室温断裂伸长率为8%;450℃叠轧板材中动态再结晶晶粒大多数尺寸约为1～3μm左右,550℃叠轧板材中动态再结晶晶粒大多数尺寸约为600 nm～2μm。结论通过提高温度,可改善界面结合性能,促进基面晶粒往非基面取向偏转,提升了叠轧板材的力学性能,使叠轧板材由较低温度下的脆性断裂向韧性断裂转变。
The paper aims to study on effects of rolling temperature on microstructure and properties of AZ31 magnesium alloy sheets. The metallographic structure of interface crack, RD-ND crystal orientation, mechanical properties and the cross-section morphology of the AZ31 magnesium alloy sheet which was rolled respectively at the 450 ℃ and 550 ℃ were studied. The room temperature fracture elongation of ARB2 magnesium alloy sheet prepared by accumulative rolling at 450 ℃was 2.3%, and that of ARB2 magnesium alloy sheet prepared by accumulative rolling at 550 was 8%; most of the dynamic recrystallization grains in 450 ℃ rolled sheet were about 1～3 μm, and in 550 were about 600 nm～2 μm. Improving the temperature can improve the interface bonding performance, promote the base level grain deflection to the base orientation, improve the mechanical properties of the accumulative roll-bonding sheet, and transform the sheet brittle fracture to ductile fracture by raising the temperature.
The paper aims to study on effects of rolling temperature on microstructure and properties of AZ31 magnesium alloy sheets. The metallographic structure of interface crack, RD-ND crystal orientation, mechanical properties and the cross-section morphology of the AZ31 magnesium alloy sheet which was rolled respectively at the 450 ℃ and 550 ℃ were studied. The room temperature fracture elongation of ARB2 magnesium alloy sheet prepared by accumulative rolling at 450 ℃was 2.3%, and that of ARB2 magnesium alloy sheet prepared by accumulative rolling at 550 was 8%; most of the dynamic recrystallization grains in 450 ℃ rolled sheet were about 1～3 μm, and in 550 were about 600 nm～2 μm. Improving the temperature can improve the interface bonding performance, promote the base level grain deflection to the base orientation, improve the mechanical properties of the accumulative roll-bonding sheet, and transform the sheet brittle fracture to ductile fracture by raising the temperature.
引文
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[11]TROJANOVáZ,DZUGAN J,HALME?OVáK,et al.Influence of Accumulative Roll Bonding on the Texture and Tensile Properties of an AZ31 Magnesium Alloy Sheets[J].Materials,2018(11):73.
[12]VALLE J A D,PéREZ-PRADO M T,RUANO O A.Texture Evolution during Large-strain Hot Rolling of the Mg AZ61 Alloy[J].Materials Science&Engineering A,2003(355):68-78.
[13]IWANAGA K,TASHIRO H,OKAMOTO H,et al.Improvement of Formability from Room Temperature to Warm Temperature in AZ31 Magnesium Alloy[J].Journal of Materials Processing Technology,2004(155/156):1313-1316.
[14]CHINO Y,MABUCHI M,KISHIHARA R,et al.Mechanical Properties and Press Formability at Room Temperature of AZ31 Mg Alloy Processed by Single Roller Drive Rolling[J].Materials Transactions,2005(43):2554-2560.
[2]DANESH M H,KARIMI T A.Study of Mechanisms of Cold Roll Welding of Aluminum Alloy to Steel Strip[J]Materials science and technology,2004,20(8):1064-1068.
[3]CAVE J.The Mechanisms of Cold Pressure Welding by Rolling[J].Journal of the Institute of Metals,1973,101(7):203-207.
[4]ROOHOLLAH J,MOHAMMAD R T.Effect of Friction,Annealing Conditions and Hardness on the Bond Strength of Al/Al Strips Produced by Cold Roll Bonding Process[J].Materials and Design,2010(31):4508-4513.
[5]詹美燕,李春明,张卫文,等.AZ31镁合金在累积叠轧焊过程中的界面焊合研究[J].材料工程,2012(1):18-24.ZHAN Mei-yan,LI Chun-ming,ZHANG Wei-wen,et al.Study on the Interface Bonding of AZ31 Magnesium Alloy During Accumulative Rolling[J].Materials Engineering,2012(1):18-24.
[6]丁祎,陈拂晓,郭俊卿,等.AZ63镁合金累积叠轧界面焊合条件研究[J].塑性工程学报,2017,24(4):62-66.DING Yi,CHEN Fu-xiao,GUO Jun-qing,et al.Study on Interface Bonding Conditions of AZ63 Magnesium Alloy by Accumulative Rolling[J].Journal of Plastic Engineering2017,24(4):62-66.
[7]GUO F,ZHANG D,FAN X,et al.Deformation Behavior of AZ31 Mg Alloys Sheet during Large Strain Hot Rolling Process:A Study on Microstructure and Texture Evolutions of an Intermediate-rolled Sheet[J].Journal of Alloys&Compounds,2016(663):140-147.
[8]SANDLOBES S,ZAEFFERER S,SCHESTAKEOW I,et al.On the Role of Non-basal Deformation Mechanisms for the Ductility of Mg and Mg-Y Alloys[J].Acta Materialia,2011(59):429-439.
[9]陈振华,许芳艳,傅定发,等.镁合金的动态再结晶[J].化工进展,2006,25(2):140-146.CHEN Zhen-hua,XU Fang-yan,FU Ding-fa,et al.Dynamic Recrystallization of Magnesium Alloy[J].Chemical Progress,2006,25(2):140-146.
[10]LIU Y.Transient Plasticity and Microstructural Evolution of a Commercial AZ31 Magnesium Alloy at Elevated Temperatures[D].Michigan:Wayne State University,2003:111-124.
[11]TROJANOVáZ,DZUGAN J,HALME?OVáK,et al.Influence of Accumulative Roll Bonding on the Texture and Tensile Properties of an AZ31 Magnesium Alloy Sheets[J].Materials,2018(11):73.
[12]VALLE J A D,PéREZ-PRADO M T,RUANO O A.Texture Evolution during Large-strain Hot Rolling of the Mg AZ61 Alloy[J].Materials Science&Engineering A,2003(355):68-78.
[13]IWANAGA K,TASHIRO H,OKAMOTO H,et al.Improvement of Formability from Room Temperature to Warm Temperature in AZ31 Magnesium Alloy[J].Journal of Materials Processing Technology,2004(155/156):1313-1316.
[14]CHINO Y,MABUCHI M,KISHIHARA R,et al.Mechanical Properties and Press Formability at Room Temperature of AZ31 Mg Alloy Processed by Single Roller Drive Rolling[J].Materials Transactions,2005(43):2554-2560.