Effects of deformation temperature on microstructure and mechanical properties of multi-directional forged 7050 aluminum alloy
HUANG Haowei1, WANG Haijun2, ZHANG Shuai2, LI Huizhong1,3, LIANG Xiaopeng1,3, ZENG Zhiheng4
1. School of Materials Science and Engineering, Central South University, Changsha 410083, China; 2. Guizhou Aerospace Xinli Technology Co., Ltd., Zunyi 562003, China; 3. Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha 410083, China; 4. Hunan Phohom New Material Technology Co., Ltd., Changsha 410221, China
Abstract：Multi-directional forging tests with different deformation temperatures (390, 420, 450 ℃) were carried out on homogenized 7050 aluminum alloy ingots. The effects of deformation temperature on the microstructure and mechanical properties of forged, solution-treated, and aged 7050 aluminum alloy were investigated using optical microscope, scanning electron microscope, electron backscattered diffraction, transmission electron microscope, as well as room temperature tensile tests. The results show that multi-directional forging can reduce the amount of residual crystalline phases, the area fraction of residual phases decreases with the increase of deformation temperature. The core of the alloys basically represents as coarse initial grains, the extent of dynamic recrystallization rises with the increase of deformation temperature after multi-directional forging; the area fraction of residual crystalline phases decreases, and the content of sub-grains increases with the increase of deformation temperature after solid-solution treatment; the amount of nanoscale precipitated phase increases with the increase of deformation temperature after aging treatment. The strength of the aged alloy increases with the increase of the deformation temperature. When the deformation temperature is 450 ℃, the comprehensive mechanical properties of the alloy are the best. The yield strength is 496.7 MPa, the tensile strength is 555.1 MPa, and the elongation is 8.1%.
[1] 陈小明, 宋仁国, 李杰. 7xxx系铝合金的研究现状及发展趋势[J]. 材料导报, 2009, 23(3): 67-70. CHEN Xiaoming, SONG Renguo, LI Jie.Current research status and development trends of 7xxx series aluminum alloys[J]. Materials Reports, 2009, 23(3): 67-70. [2] 方华婵, 陈康华, 巢宏, 等. Al-Zn-Mg-Cu系超强铝合金的研究现状与展望[J]. 粉末冶金材料科学与工程, 2009, 14(6): 351-358. FANG Huachan, CHEN Kanghua, CHAO Hong, et al.Current research status and prospects of ultra strength Al-Zn-Mg-Cu aluminum alloy[J]. Materials Science and Engineering of Powder Metallurgy, 2009, 14(6): 351-358. [3] 朱钦, 麻彦龙, 谭巧缘, 等. 7050铝合金的显微组织、腐蚀行为及其调控研究现状与展望[J]. 中国有色金属学报, 2023, 33(11): 3525-3546. ZHU Qin, MA Yanlong, TAN Qiaoyuan, et al.Research status and prospect of microstructure, corrosion behavior and their regulation of 7050 aluminum alloy[J]. The Chinese Journal of Nonferrous Metals, 2023, 33(11): 3525-3546. [4] 王祝堂, 田荣璋. 铝合金及其加工手册[M]. 长沙: 中南大学出版社, 2007: 655-659. WANG Zhutang, TIAN Rongzhang.Handbook of Aluminum Alloys and Their Processing[M]. Changsha: Central South University Press, 2007: 655-659. [5] 张新明, 邓运来, 张勇. 高强铝合金的发展及其材料的制备加工技术[J]. 金属学报, 2015, 51(3): 257-271. ZHANG Xinming, DENG Yunlai, ZHANG Yong.Development of high strength aluminum alloys and processing techniques for the materials[J]. Acta Metallurgica Sinica, 2015, 51(3): 257-271. [6] VALIEV Z R, ESTRIN Y, HORITA Z, et al.Producing bulk ultrafine-grained materials by severe plastic deformation[J]. JOM, 2006, 58(4): 33-39. [7] FURUKAWA M, HORITA Z, NEMOTO M, et al.Review: processing of metals by equal-channel angular pressing[J]. Journal of Materials Science, 2001, 36(12): 2835-2843. [8] ZHILYAEV A P, LANGDON T G.Using high-pressure torsion for metal processing: fundamentals and applications[J]. Progress in Materials science, 2008, 53(6): 893-979. [9] ARUN A, POOVAZHGAN L.Review on accumulative roll bonding (ARB) techniques for improving the mechanical properties of multi-layered materials[J]. Materials Science Forum, 2020, 59(31): 84-88. [10] MANJUNATH G A, SHIVAKUMAR S, FERNANDEZ R, et al.A review on effect of multi-directional forging/multi-axial forging on mechanical and microstructural properties of aluminum alloy[J]. Materials Today: Proceedings, 2021, 47: 2565-2569. [11] WANG M, HUANG L, LIU W, et al.Influence of cumulative strain on microstructure and mechanical properties of multi-directional forged 2A14 aluminum alloy[J]. Materials Science and Engineering A, 2016, 674: 40-51. [12] 刘文胜, 刘东亮, 马运柱, 等. 变形温度对2A14铝合金显微组织和力学性能的影响[J]. 中国有色金属学报, 2015, 25(2): 308-314. LIU Wensheng, LIU Dongliang, MA Yunzhu, et al.Effects of deformation temperature on microstructure and mechanical properties of 2A14 aluminum alloy[J]. The Chinese Journal of Nonferrous Metals, 2015, 25(2): 308-314. [13] 魏德金, 韩陆依, 吕正风, 等. 多向锻造对Al-Zn-Mg-Cu合金缺陷消除及微观组织的影响[J]. 机械工程学报, 2023, 59(24): 131-139. WEI Dejin, HAN Luyi, LÜ Zhengfeng, et al.Effect of multi-directional forging on defect elimination and microstructure of Al-Zn-Mg-Cu alloy[J]. Journal of Mechanical Engineering, 2023, 59(24): 131-139. [14] ZHANG Z X, QU S J, FENG A H, et al.Achieving grain refinement and enhanced mechanical properties in Ti-6Al-4V alloy produced by multidirectional isothermal forging[J]. Materials Science and Engineering A, 2017, 692: 127-138. [15] 吴远志, 严红革, 朱素琴, 等. 多向锻造ZK60镁合金组织和性能的均匀性[J]. 中国有色金属学报, 2014, 24(2): 310-316. WU Yuanzhi, YAN Hongge, ZHU Suqin, et al.Homogeneity of microstructure and mechanical properties of ZK60 magnesium alloys fabricated by high strain rate triaxial-forging[J]. The Chinese Journal of Nonferrous Metals, 2014, 24(2): 310-316. [16] ZHU Q, LEI L I, BAN C, et al.Structure uniformity and limits of grain refinement of high purity aluminum during multi-directional forging process at room temperature[J]. Transactions of Nonferrous Metals Society of China, 2014, 24(5): 1301-1306. [17] WANG D, YI Y, LI C, et al.Effects of different multidirectional forging processes on the microstructure and three-dimensional mechanical properties of ultra-high strength aluminum alloys[J]. Materials Science and Engineering A, 2021, 826: 141932. [18] WANG D, ZHANG W, HUANG S, et al.Effect of three-dimensional deformation at different temperatures on microstructure, strength, fracture toughness and corrosion resistance of 7A85 aluminum alloy[J]. Journal of Alloys and Compounds, 2022, 928: 167200. [19] 崔忠圻, 刘北兴. 金属学与热处理原理[M]. 哈尔滨: 哈尔滨工业大学出版社, 2007: 209-210. CUI Zhongqi, LIU Beixing.Principles of Metallogy and Heat Treatment[M]. Harbin: Harbin Institute of Technology Press, 2007: 209-210. [20] WERZ T, BAUMANN M, WOLFRAM U, et al.Particle tracking during Ostwald ripening using time-resolved laboratory X-ray microtomography[J]. Materials Characterization, 2014, 90: 185-195. [21] WANG B, YI Y, HE H, et al.Effects of deformation temperature on second-phase particles and mechanical properties of multidirectionally-forged 2A14 aluminum alloy[J]. Journal of Alloys and Compounds, 2021, 871: 159459.
2024, Vol. 29 
