Hot Compression Microstructure and Rheological Behavior of Rolled 7A60 Aluminum Alloy
XUE Kemin1, BO Dongqing2, LI Ping1
1 School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009; 2 Intelligent Manufacturing Institute of HFUT, Hefei 230009
Abstract: The microstructral characteristics and flow behaviors of rolled 7A60 aluminum alloy experienced hot compression were investigated within a stress rate range of 0.1—0.01 s-1 and a temperature range of 250—350 ℃.The results confirmed the wea-kened anisotropy, the enhanced uniformity, and the obviously coarsened grain for the material with the decrease in strain rate and the increase in temperature. In the process of thermal deformation, the main softening mechanism is dynamic recovery and dynamic recrystallization. The peak stress increases with the increase of strain rate and decreases with the increase of temperature. And at the strain rate of 0.01 s-1, a significant discontinuous dynamic recrystallization behavior occurred. The rheological behavior of the alloy can be characterized by a hyperbolic sine function with a thermal activation energy of 438.981 kJ/mol.
1 Zhang X M, Deng Y L, Zhang Y. Development of high strength aluminum alloy and its material preparation and processing technology[J].Acta Metallurgica Sinica,2015,51(3):257(in Chinese). 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. 2 Yang H T, Lu Z, Gu J L. Study on flow stress of 7A60 aluminum alloy[J].Journal of Aeronautical Materials,2005,25(2):12(in Chinese). 杨洪涛,陆政,顾家琳.7A60铝合金流变应力的研究[J].航空材料学报,2005,25(2):12. 3 Wang Xuehui, Wang Jihui, Fu Congwei. Characterization of pitting corrosion of 7A60 aluminum alloy by EN and EIS techniques[J].Transactions of Nonferrous Metals Society of China,2014,24(12):390. 4 Wang J L, Li P, Xue K M, et al. Failure analysis and improvement of cup-shaped isothermal and torsion composite mold[J].Journal of Harbin Institute of Technology,2015,47(11):113(in Chinese). 王久林,李萍,薛克敏,等.杯形件等温压扭复合成形模具失效分析及改进[J].哈尔滨工业大学学报,2015,47(11):113. 5 Li P, Zhang X, Xue K M, et al. New process deformation of pure aluminum isometric corner twist[J].Chinese Journal of Plastic Engineering,2010,17(5):47(in Chinese). 李萍,张翔,薛克敏,等.纯铝等径角挤扭新工艺变形[J].塑性工程学报,2010,17(5):47. 6 Qiu L L, Gao W L, Lu Z, et al. Hot-compression rheological beha-vior and microstructure of 7A85 aluminum alloy[J].Materials Engineering,2016,44(1):33(in Chinese). 仇琍丽,高文理,陆政,等.7A85铝合金的热压缩流变行为与显微组织[J].材料工程,2016,44(1):33. 7 Chen X H, Chen K H, Liang X. Flow stress behavior and microstructure of 7085 aluminum alloy thermal deformation[J].Journal of Aeronautical Materials,2011,16(2):225(in Chinese). 陈学海,陈康华,梁信.7085铝合金热变形的流变应力行为和显微组织[J].航空材料学报,2011,16(2):225. 8 Jia F B, Yi Y P, Huang S Q, et al. Study on rheological behavior and constitutive equation of 7A85 aluminum alloy hot compression[J].Hot Working Technology,2010,39(16):19(in Chinese). 贾逢博,易幼平,黄施全,等.7A85铝合金热压缩流变行为与本构方程研究[J].热加工工艺,2010,39(16):19. 9 Chen S Y, Chen K H, Peng G S, et al. Effect of heat treatment on hot deformation behavior and microstructure evolution of 7085 aluminum alloy[J].Journal of Alloys and Compounds,2012,537(5):338. 10 Wei W, Jiang P, Cao F. High temperature constitutive relation of 6082 aluminum alloy[J].Journal of Plastic Engineering,2013,20(2):100(in Chinese). 韦韡,蒋鹏,曹飞.6082铝合金的高温本构关系[J].塑性工程学报,2013,20(2):100. 11 Zhang H, Jin N P, Chen J H. Hot deformation behavior of Al-Zn-Mg-Zr aluminum alloys during compression at elevated temperature[J].Transactions of Nonferrous Metals Society of China,2011,21(3):437. 12 Liu W S, Guo L W, Ma Y Z, et al. Microstructure and rheological behavior of 2A14 aluminum alloy thermal deformation[J].Chinese Journal of Nonferrous Metals,2013,23(8):2091(in Chinese). 刘文胜,郭伦文,马运柱,等.2A14铝合金热变形的显微组织及流变行为[J].中国有色金属学报,2013,23(8):2091. 13 Ji Hyun Sung, Ji Hoom Kim, Wagoner R H. A plastic constitutive equation incorporating strain-rate,and temperature[J].International Journal of Plasticity,2010,26(12):1746. 14 Cai Yiming,Li Huizhong,Liang Xiaopeng,et al.Thermal deformation behavior for 7039 aluminum alloy at elevated temperature[J].Tran-sactions of Nonferrous Metals Society of China,2008,18(10):1775 15 Jabbari Taleghani M A, Ruiz Navas E M, Salehi M, et al. Hot deformation behavior and flow stress prediction of 7075 aluminum alloy powder compacts during compression at elevated temperatures[J].Materials science and Engineering A,2012,534(1):624. 16 Gourdet S,Montheillet F.A model of continuous dynamic recrystallization[J].Acta Materialia,2003,23(9):2685. 17 Xu X, Yang M, Liang Y L, et al. Research on hot compressive deformation and processing map of 211Z. X heat-resisting high strength aluminium alloy[J].Materials Review B:Research Papers,2016,30(9):143(in Chinese). 徐祥,杨明,梁益龙,等.211Z.X耐热高强韧铝合金热变形行为及加工图研究[J].材料导报:研究篇,2016,30(9):143.
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2018, Vol. 32 
