Transactions of Materials and Heat Treatment

Title：Effect of isothermal and nonisothermal extrusion on layer thickness uniformity and mechanical properties for 7075/AZ31B composite tubes

Authors： Li Peng1 2 3 Wang Tao1 2 3 Huang Qingxue1 2 3

Unit： 1.College of Mechanical Engineering Taiyuan University of Technology 2.Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment Ministry of Education Taiyuan University of Technology 3.National Key Laboratory of Metal Forming Technology and Heavy Equipment Taiyuan University of Technology

KeyWords： extrusion temperature 7075/AZ31B composite tube layer thickness uniformity microstructure mechanical properties

ClassificationCode：TG376；TB331

year,vol(issue):pagenumber：2025,50(3):157-169

Abstract：

In order to achieve the efficient fabrication of 7075/AZ31B composite tubes, the influences of extrusion process on the layer thickness uniformity and mechanical properties of 7075/AZ31B composite tubes were investigated. Then, 7075/AZ31B composite tube was successfully fabricated by isothermal and non-isothermal extrusion at 380 and 410 ℃. Furthermore, the uniformity of the circumferential and axial layer thicknesses was analyzed, and the mechanical properties were tested. The results show that the AZ31B magnesium alloys in the inner layer of the tubes formed at 380 ℃ with isothermal extrusion and 410 ℃ with non-isothermal extrusion simultaneously possess superior axial and circumferential uniformity, and the diffusion layer thickness for the tubes extruded isothermally at 380 ℃ is 7.4 μm. The mechanical properties of the tubes extruded isothermally and non-isothermally at 380 ℃ are superior to those extruded at 410 ℃. Specifically, the tensile strength and elongation of the tube extruded isothermally at 380 ℃ are 307 MPa and 19.5%, respectively, and those of the tube extruded non-isothermally at 380 ℃ are 346 MPa and 15.5%, respectively. The research results indicate that increasing the extrusion temperature of the 7075/AZ31B composite tube is not conducive to improving its mechanical properties. By comparison, it is found that the 7075/AZ31B composite tube extruded at 380 ℃ has both better layer thickness uniformity and mechanical properties.

Funds：

国家自然科学基金区域联合重点项目(U22A20188)；国家杰出青年基金资助项目（52425504）

作者简介：李朋（1994-），男，博士研究生 E-mail：1604942439@qq.com 通信作者：王涛 (1985-)，男，博士，教授 E-mail：twang@tyut.edu.cn

Reference：

[1]Li T, Wang T, Liu W W, et al. Hotrolling process and properties of large thickness ratio Al/Mg/Al laminates[J]. Transactions of Nonferrous Metals Society of China, 2023, 33(12): 3625-3640.

[2]Wang T, Li S, Ren Z K, et al. Microstructure characterization and mechanical property of Mg/Al laminated composite prepared by the novel approach: Corrugated+ flat rolling (CFR)[J]. Metals, 2019, 9(6): 690.

[3]Mahmoodkhani Y, Wells M A. Coextrusion process to produce AlMg eutectic clad magnesium products at elevated temperatures[J]. Journal of Materials Processing Technology, 2016, 232: 175-183.

[4]Chen L, Tang J W, Zhao G Q, et al. Fabrication of Al/Mg/Al laminate by a porthole die coextrusion process[J]. Journal of Materials Processing Technology, 2018, 258: 165-173.

[5]Zhang W, Hu H J, Hu G, et al. A direct extrusion-shear deformation composite process that significantly improved the metallurgical bonding and texture regulation grain refinement and mechanical properties of hotextruded AZ31/AA6063 composite tubes[J]. Materials Science and Engineering: A, 2023, 880: 145090.

[6]龙琼,路坊海,张玉兰,等. Mg/Al异种金属焊接技术的研究现状及最新进展[J]. 轻金属, 2018(2): 47-53.

Long Q, Lu F H, Zhang Y L, et al. Present research status and new development of the welding technologies of Mg/Al dissimilar metals [J]. Light Metals, 2018(2): 47-53.

[7]刘政军，宫颖，苏允海，等. Mg/Al 固相连接镁铝元素扩散行为的分析[J]. 热加工工艺, 2014, 43(13): 38-40.

Liu Z J, Gong Y, Su Y H, et al. Analysis of diffusion behavior of MgAl element in Mg/Al solid phase bonding[J]. Hot Working Technology, 2014,43(13): 38-40.

[8]崔鹏杰，钟黎声，白海强，等. 铸造在层状双金属复合材料中的应用[J]. 热加工工艺, 2020, 49(19): 1-6.

Cui P J, Zhong L S, Bai H Q, et al. Application of casting in layered bimetallic composites[J]. Hot Working Technology, 2020, 49(19): 1-6.

[9]战立强，王刚，杨建雷，等. AZ31/7475方形双金属复合管气压胀形-冷缩结合工艺[J]. 塑性工程学报,2021,28(10):69-76.

Zhan L Q, Wang G, Yang J L, et al. Gas blow forming and contradictive cooling bonding technology of AZ31/7475 square bimetal composite tube[J]. Journal of Plasticity Engineering，2021，28 (10): 69-76.

[10]石宁，王文先，张婷婷，等. 镁/铝复合管错距旋压成型有限元模拟及分析[J]. 太原理工大学学报, 2021, 52(2): 269-273.

Shi N, Wang W X, Zhang T T, et al. Finite element simulation and analysis of magnesium/aluminum composite tube with stagger spinning [J]. Journal of Taiyuan University of Technology, 2021, 52(2): 269-273.

[11]Mróz S, Mola R, Szota P, et al. Microstructure and properties of 1050A/AZ31 bimetallic bars produced by explosive cladding and subsequent groove rolling process[J]. Archives of Civil and Mechanical Engineering, 2020, 20（3）: 1-15.

[12]Golovko O, Bieliaiev S M, Nürnberger F, et al. Extrusion of the bimetallic aluminummagnesium rods and tubes[J]. Forschung im Ingenieurwesen, 2015, 1(79): 17-27.

[13]Mróz S, JagielskaWiaderek K, Szota P, et al. Effect of the shape of rolling passes and the temperature on the corrosion protection of the Mg/Al bimetallic bars[J]. Materials, 2021, 14(22): 6926.

[14]王刚, 孔得红, 李思奕，等. 镁/铝双金属复合管气压胀形-冷缩结合工艺研究[J]. 稀有金属材料与工程, 2018, 47(11): 3517-3521.

Wang G, Kong D H, Li S Y, et al. Gas blow formingcold contraction bonding technology of Mg/Al bimetallic composite tube[J]. Rare Metal Materials and Engineering, 2018, 47(11): 3517-3521.

[15]王刚, 孔得红, 谢允聪，等. AZ31/AA5083双金属筒形件气压胀形-冷缩结合工艺[J]. 中国有色金属学报, 2018, 28(4): 712-718.

Wang G, Kong D H, Xie Y C, et al. Gas blow formingcooling contraction bonding process of AZ31/AA5083 bimetallic cylinder[J].The Chinese Journal of Nonferrous Metals, 2018, 28(4): 712-718.

[16]杜艳梅, 王开坤, 张鹏，等. 半固态挤压铝/镁合金双金属复合管的有限元模拟 [J]. 中国有色金属学报, 2009, 19(2): 208-216.

Du Y M, Wang K K, Zhang P, et al. FEM simulation on extrusion of doublelayer tube of aluminum and magnesium alloys [J]. The Chinese Journal of Nonferrous Metals, 2009, 19(2): 208-216.

[17]Hosseini S M, Roostaei M, Mosavi Mashhadi M, et al. Fabrication of Al/Mg bimetallic thinwalled ultrafinegrained tube by severe plastic deformation[J]. Journal of Materials Engineering and Performance, 2022, 31(5): 4098-4107.

[18]Ye T, Hu H J, Zhang D F. A novel severe plastic deformation method for manufacturing Al/Mg bimetallic tube[J]. The International Journal of Advanced Manufacturing Technology, 2021, 116(7-8):2569-2575.

[19]Zhao J X, Zhang H L, Zhang W, et al. Influence of extrusion method on formation of magnesiumaluminum bimetallic composite tube[J]. Journal of Materials Engineering and Performance, 2023, 32(16): 7134-7148.

[20]彭威，曾朝伟，孙振威，等.基于数值模拟和实验的Mg/Al复合管材成形工艺研究[J]. 精密成形工程, 2023, 15(6): 27-36.

Peng W, Zeng C W, Sun Z W, et al. Forming process of Mg/Al composite tubes based on numerical simulation and experiment[J].Journal of Netshape Forming Engineering,2023, 15(6): 27-36.

[21]Zhao J X, Sun Z W, Yuan T, et al. A novel forming process of Mg/Al composite square tube based on numerical simulations and experiments[J]. Materials Today Communications, 2023, 35: 105526.

[22]彭宇, 杨程, 彭迎娇, 等. 7075-T6高强铝合金温热变形本构方程及热加工图[J].锻压技术，2023，48(9)：230-238.

Peng Y, Yang C, Peng Y J, et al. Warm deformation constitutive equation and thermal processing map of 7075-T6 high strength aluminum alloy[J]. Forging & Stamping Technology，2023，48(9)：230-238.

[23]武磊, 何兵, 覃铭.7075铝板多道次轧制和固溶时效工艺优化[J].锻压技术,2024,49(9):115-121.

Wu L, He B, Qin M.Process optimization of multipass rolling and solution aging for 7075 aluminumplate[J]. Forging & Stamping Technology，2024，49(9)：115-121.

[24]王帆, 赵小莲.室温下多向锻造及时效处理对7075铝合金力学性能和摩擦磨损性能的影响[J].锻压技术,2024,49(12):1-8.

Wang F, Zhao X L.Effects of multidirectional forging and aging treatment on mechanical properties and friction and wear properties for 7075 aluminum alloy at room temperature [J]. Forging & Stamping Technology，2024，49(12)：1-8.

[25]杨青山, 颜宏伟, 彭鹏, 等.高成形镁合金板材最新研究进展[J].稀有金属,2024,48(3):398-410.

Yang Q S, Yan H W, Peng P, et al. Latest progress of high formability in Mg alloy sheets： A Review [J]. Chinese Journal of Rare Metals, 2024,48(3):398-410.

[26]毛睿成, 卢立伟, 范宇田, 等.轧制温度对深冷AZ31镁合金组织与性能的影响[J].锻压技术,2024,49(1):134-141.

Mao R C, Lu L W, Fan Y T, et al.Influence of rolling temperature on microstructure and properties ofcryogenically treated AZ31 magnesium alloy [J]. Forging & Stamping Technology，2024，49(1)：134-141.

[27]张文玉, 刘先兰, 邓彬, 等. 轧制温度对AZ31镁合金板材组织和性能的影响[J]. 锻压技术，2023，48(1)：158-164.

Zhang W Y, Liu X L, Deng B, et al. Influence of rolling temperature on microstructure and properties of AZ31 magnesium alloy sheet [J]. Forging & Stamping Technology，2023，48(1)：158-164.

[28]Kim Y J, Lee J U, Kim Y M, et al. Microstructural evolution and grain growth mechanism of pretwinned magnesium alloy during annealing[J]. Journal of Magnesium and Alloys, 2021, 9(4): 1233-1245.

[29]Tang J W, Chen L, Zhao G Q, et al. Formation mechanism of abnormal coarse grains on weld seam of extruded ZK60 alloy and the effects on mechanical properties[J]. Materials Science and Engineering: A, 2020, 773: 138718.

[30]王耀奇，姜波，查苏娜，等. 镁铝复合板制备及成形技术研究进展[J]. 航空制造技术, 2023, 66(12): 22-36.

Wang Y Q, Jiang B, Cha S N, et al. Research progress of preparation and forming technology of magnesium aluminum composite plate[J]. Aeronautical Manufacturing Technology, 2023, 66(12): 22-36.

[31]Mojtaba J,Alireza K,Sahebali M.Evaluation of diffusion welding of 6061 aluminum and AZ31 magnesium alloys without using an interlayer[J].Materials and Design,2014,65:160-164.

[32]Funamizu Y, Watanabe K. Interdiffusion in the AlMg system[J]. Transactions of the Japan Institute of Metals, 1972, 13(4): 278-283.

[33]Wang P J, Chen Z J, Hu C, et al. Effects of annealing on the interfacial structures and mechanical properties of hot roll bonded Al/Mg clad sheets[J]. Materials Science and Engineering: A, 2020, 792：139673.

[34]Xiao L, Wang N. Growth behavior of intermetallic compounds during reactive diffusion between aluminum alloy 1060 and magnesium at 573-673 K[J]. Journal of Nuclear Materials, 2015, 456: 389-397.

[35]Liu W S, Long L P, Ma Y Z, et al. Microstructure evolution and mechanical properties of Mg/Al diffusion bonded joints[J]. Journal of Alloys and Compounds, 2015, 643: 34-39.

[36]Wang C P, Xin R L, Li D R, et al. Enhancing the agehardening response of rolled AZ80 alloy by pretwinning deformation[J]. Materials Science and Engineering: A, 2017, 680: 152-156.

[37]Nie H H, Zheng L W, Kang X W, et al. Insitu investigation of deformation behavior and fracture forms of Ti/Al/Mg/Al/Ti laminates[J]. Transactions of Nonferrous Metals Society of China, 2021, 31(6): 1656-1664.

[38]Hao X W, Lu H H, Nie H H, et al. Insitu investigation of crack initiation and propagation in rollbonded fiveply ASS/Al/Mg/Al/ASS laminated composites during tensile test[J]. Journal of Alloys and Compounds, 2020, 822: 153608.

[39]Lee K S, Kim J S, Jo Y M, et al. Interfacecorrelated deformation behavior of a stainless steelAlMg 3-ply composite[J]. Materials Characterization, 2013, 75: 138-149.

[40]Li T, Wang T, Quan X H, et al. Effect of annealing parameters on the interfacial structures and mechanical properties of Al/Mg/Al laminates with large thickness ratio[J]. Materials Today Communications, 2023, 37: 107441.

[41]Chen Z, Wang D, Cao X H, et al. Influence of multipass rolling and subsequent annealing on the interface microstructure and mechanical properties of the explosive welding Mg/Al composite plates[J]. Materials Science and Engineering: A, 2018, 723: 97-108.

[42]Kim J S, Park J, Lee K S, et al. Correlation between bonding strength and mechanical properties in Mg/Al twoply clad sheet[J]. Metals and Materials International, 2016, 22: 771-780.

Service：

【This site has not yet opened Download Service】【Add Favorite】