锻压技术

热轧压下率对车用大厚度比镁铝合金板组织和力学性能的影响

英文标题：Effects of hot rolling reduction rate on microstructure and mechanical properties of Mg/Al alloy plate with large thickness ratio used in automotive

作者：赵华瑞1 丁彦霞2

单位：1. 新乡职业技术学院 2. 河南师范大学

关键词：热轧压下率大厚度比镁铝合金板微观组织力学性能

分类号：TG146

出版年,卷(期):页码：2021,46(10):99-105

摘要：

选择厚度为0.2 mm的6063铝合金与厚度为5.0 mm的AZ80镁合金进行组坯，设定厚度比为20，分析各热轧压下率下、以热轧方式制得的大厚度比镁铝合金板的组织和力学性能。研究结果表明：当热轧压下率达到45%或更高时，镁铝合金板形成了结合性能优异的界面，镁基体内形成了均匀分布的细小晶粒；提高热轧压下率后，基体中的晶粒尺寸不断减小，此时形成了更小的晶粒尺寸离散系数，更多晶粒被压碎，晶粒分布状态也比较均匀；提高热轧压下率后，获得了更高屈服强度的大厚度比镁铝合金板，材料发生了更明显的加工硬化，而抗拉强度则先增大再下降，当热轧压下率达到55%时，获得了最大的抗拉强度；当热轧压下率达到65%时，韧窝数量明显增多，表明镁合金通过动态再结晶转变获得了更强的韧性。屈服应力呈现明显波动的状态，热轧压下率为35%时，获得了最高的屈服强度，65%热轧压下率下的屈服强度最低，逐渐提高热轧压下率后，屈服应力也不断减小。

The billets of 6063 aluminum alloy with the thickness of 0.2 mm and AZ80 magnesium alloy with the thickness of 5.0 mm was selected to assembling and the thickness ratio was set as 20. The microstructure and mechanical properties of Al/Mg alloy plate with large thickness ratio were analyzed under various hot rolling reduction rates by hot rolling. The results show that when the hot rolling reduction rate reaches 45% or higher, Al/Mg alloy plate forms an interface with excellent bonding performance, and the fine grains are evenly distributed in the magnesium matrix. After increasing the hot rolling reduction rate, the grain size of matrix decreases continuously. At this time, the smaller grain size dispersion coefficient is formed, more grains are crushed, and the grain distribution is more uniform. After increasing the hot rolling reduction rate, the Al/Mg alloy plate with larger thickness ratio and higher yield strength is obtained, and the material undergoes more obvious work hardening. The tensile strength increases first and then decreases, and the maximum tensile strength is obtained when the hot rolling reduction rate reaches 55%. The number of dimples increases significantly when the hot rolling reduction rate reaches 65%, indicating that the magnesium alloy obtaines stronger toughness through dynamic recrystallization transformation. The yield stress fluctuates obviously. The highest yield strength is obtained when the hot rolling reduction rate is 35%, and the lowest yield strength is obtained when the hot rolling reduction rate is 65%. After increasing the hot rolling reduction rate gradually, the yield stress also decreases continuously.

基金项目：

国家自然科学金资助项目（51775172）

作者简介：赵华瑞（1989-），男，学士，讲师 E-mail：Z13462362008@126.com

参考文献：

[1]Pérez-Prado M T, Valle J A D, Contreras J M, et al. Microstructural evolution during large strain hot rolling of an AM60 Mg alloy[J]. Scripta Materialia, 2004, 50(5): 661-665.

[2]马啸昌，冯光，王涛，等. 厚度配比对轧制Cu/Al复合板拉剪强度的影响 [J]. 锻压技术，2020,45(6):45-52.

Ma X C，Feng G，Wang T，et al. Influence of thickness proportion on tensile-shear strength for rolling Cu/Al composite sheets [J]. Forging & Stamping Technology，2020,45(6):45-52.

[3]Pekguleryuz M, Celikin M, Hoseini M, et al. Study on edge cracking and texture evolution during 150 ℃ rolling of magnesium alloys: The effects of axial ratio and grain size[J]. Journal of Alloys & Compounds, 2012, 510(1): 0-20.

[4]刘鹏涛, 马立峰, 贾伟涛, 等. 包铝镁合金复合板轧制制备新工艺[J]. 材料科学与工程学报, 2016, 34(3):497-499.

Liu P T, Ma L F, Jia W T, et al. New technology for rolling aluminum-magnesium alloy composite plate [J]. Journal of Materials Science and Engineering, 2016, 34(3):497-499.

[5]寇鑫，于建民，刘海军，等. Mg-13Gd-4Y-2Zn-0.5Zr合金形变软化行为及本构方程建立 [J]. 锻压技术，2020,45(3):166-173.

Kou X，Yu J M，Liu H J，et al. Deformation softening behavior and establishment of constitutive model for Mg-13Gd-4Y-2Zn-0.5Zr alloy [J]. Forging & Stamping Technology，2020, 45(3):166-173.

[6]Mori K I, Bay N, Fratini L, et al. Joining by plastic deformation[J]. Cirp Annals Manufacturing Technology, 2013, 62(2):673-694.

[7]Zheng H, Yang J, Wu R, et al. Influence of annealing temperature on the microstructure and mechanical properties of Al/Mg composite sheets fabricated by roll bonding[J]. Advanced Engineering Materials, 2016, 18(10): 1792-1798.

[8]Xie Z H, Chen F, Xiang S R, et al. Studies of several pickling and activation processes for electroless Ni-P plating on AZ31 magnesium alloy[J]. Journal of the Electrochemical Society, 2014, 162(3): 115-123.

[9]杨周林, 池成忠, 梁伟, 等. 镁铝叠层板的热轧成型及拉深性能研究[J]. 兵器材料科学与工程, 2013, 36(6):39-42.

Yang Z L, Chi C Z, Liang W, et al. Research on hot-rolled forming and deep drawing performance of magnesium aluminum laminates [J]. Weapon Materials Science and Engineering, 2013, 36(6):39-42.

[10]郑留伟, 梁伟, 王红霞, 等. 热轧参数对铸态 AZ91镁合金组织与性能的影响[J]. 材料热处理学报, 2015, 36(12): 81-86.

Zheng L W, Liang W, Wang H X, et al. Effects of hot rolling parameters on microstructure and properties of as-cast AZ91 magnesium alloy [J]. Journal of Material Heat Treatment, 2015, 36(12): 81-86.

[11]王宏岩, 梁海成. 热轧过程中压下量对AZ61镁合金组织与性能的影响[J]. 沈阳理工大学学报, 2018, 37(1): 43-46.

Wang H Y, Liang H C. Effects of hot rolling reduction on microstructure and properties of AZ61 magnesium alloy[J]. Journal of Shenyang University of Technology, 2018, 37(1): 43-46.

[12]Nie H, Liang W, Chen H, et al. A coupled EBSD/TEM study on the interfacial structure of Al/Mg laminates[J]. Journal of Alloys and Compounds, 2019, 781: 696-701.

[13]Zhang J, Liang W, Li H. Effect of thickness of interfacial intermetallic compound layers on the interfacial bond strength and the uniaxial tensile behaviour of 5052Al/AZ80Mg/5052Al clad sheets[J]. RSC Advances, 2015, 5(127): 104954-104959.

[14]楚志兵, 吕阳阳, 唐宾, 等. 表面渗铝改性镁合金的轧制组织性能[J]. 复合材料学报, 2015, 32(5): 148-154.

Chu Z B, Lyu Y Y, Tang B, et al. Structure and properties on surface of aluminizing-modification magnesium alloy in rolling[J]. Journal of Composite Materials, 2015, 32(5): 148-154.

[15]闫辰侃, 池成忠, 梁伟, 等. 镁铝叠层板的热轧成形及热冲压成形性能研究[J]. 塑性工程学报, 2013, 20(5):87-90.

Yan C K, Chi C Z, Liang W, et al. Research on hot rolling forming and hot formability of aluminum clad magnesium sheets[J]. Journal of Plastic Engineering, 2013, 20(5):87-90.

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