Abstract
The impact of cooling rate after solution heat treatment on exfoliation corrosion resistance of a Li-containing 7xxx aluminum alloy was investigated by accelerated immersion and electrochemical impedance spectroscopy test, optical microscope, electron backscatter diffraction and scanning transmission electron microscope. With the decrease of cooling rate from 1700 °C/s to 4 °C/s, exfoliation corrosion resistance of the aged specimens decreases with rating changing from EA to EC and the maximum corrosion depth increasing from about 169.4 µm to 632.1 µm. Exfoliation corrosion tends to develop along grain boundaries in the specimens with cooling rates higher than about 31 °C/s and along both grain boundaries and sub-grain boundaries in the specimens with lower cooling rates. The reason has been discussed based on the changes of the microstructure and microchemistry at grain boundaries and sub-grain boundaries due to slow cooling.
摘要
采用加速浸泡、 电化学阻抗谱测试、 光学显微镜、 电子背散射衍射和扫描透射电镜等方法, 研究固溶热处理后冷却速度对含锂7xxx铝合金抗剥落腐蚀性能的影响. 随着冷却速率从1700 °C/s降低到4 °C/s, 时效试样的抗剥落腐蚀性能下降, 等级从EA变为EC, 最大腐蚀深度从169.4 µm增加到632.1 µm. 在冷却速率大于31 °C/s 的试样中, 剥落腐蚀倾向于沿晶界发展; 在冷却速率较低的试样中, 剥落腐蚀倾向于沿晶界和亚晶界发展. 从缓慢冷却引起的晶界和亚晶界组织和微化学变化的角度分析了差异原因.
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References
DURSUN T, SOUTIS C. Recent developments in advanced aircraft aluminium alloys [J]. Materials & Design (1980–2015), 2014, 56: 862–871. DOI: https://doi.org/10.1016/j.matdes.2013.12.002.
ZHANG Xue-song, CHEN Yong-jun, HU Jun-ling. Recent advances in the development of aerospace materials [J]. Progress in Aerospace Sciences, 2018, 97: 22–34. DOI: https://doi.org/10.1016/j.paerosci.2018.01.001.
HE Ke-zhun, LI Qun, LIU Sheng-dan, et al. Influence of prestretching on quench sensitive effect of high-strength Al-Zn-Mg-Cu-Zr alloy sheet [J]. Journal of Central South University, 2021, 28(9): 2660–2669. DOI: https://doi.org/10.1007/s11771-021-4800-0.
MA Zhi-min, DENG Yun-lai, LIU Jia, et al. Effect of Quenching Rate on Stress Corrosion Cracking Susceptibility of 7136 Aluminum Alloy[J]. Acta Metallurgica Sinica, 2022, 58(9): 1118–1128. DOI: https://doi.org/10.11900/0412.1961.2021.00053.
CHEN Ming-yang, ZHENG Xu, HE Ke-zhun, et al. Local corrosion mechanism of an Al-Zn-Mg-Cu alloy in oxygenated chloride solution: Cathode activity of quenching-induced η precipitates [J]. Corrosion Science, 2021, 191: 109743. DOI: https://doi.org/10.1016/j.corsci.2021.109743.
DOLAN G P, ROBINSON J S. Residual stress reduction in 7175-T73, 6061-T6 and 2017A-T4 aluminium alloys using quench factor analysis [J]. Journal of Materials Processing Technology, 2004, 153–154: 346–351. DOI: https://doi.org/10.1016/j.jmatprotec.2004.04.065.
FENG Di, LI Xin-di, ZHANG Xin-ming, et al. The novel heat treatments of aluminium alloy characterized by multistage and non-isothermal routes: A review [J]. Journal of Central South University, 2023, 30(9): 2833–2866. DOI: https://doi.org/10.1007/s11771-023-5439-9.
MA Zhi-min, LIU Jia, YANG Zhen-shen, et al. Effect of cooling rate and grain structure on the exfoliation corrosion susceptibility of AA 7136 alloy [J]. Materials Characterization, 2020, 168: 110533. DOI: https://doi.org/10.1016/j.matchar.2020.110533.
LIU S D, CHEN B, LI C B, et al. Mechanism of low exfoliation corrosion resistance due to slow quenching in high strength aluminium alloy [J]. Corrosion Science, 2015, 91: 203–212. DOI: https://doi.org/10.1016/j.corsci.2014.11.024.
SONG Feng-xuan, ZHANG Xin-ming, LIU Sheng-dan, et al. The effect of quench rate and overageing temper on the corrosion behaviour of AA7050 [J]. Corrosion Science, 2014, 78: 276–286. DOI: https://doi.org/10.1016/j.corsci.2013.10.010.
LI Dong-feng, YIN Bang-wen, LEI Yue, et al. Critical quenching rate for high hardness and good exfoliation corrosion resistance of Al-Zn-Mg-Cu alloy plate [J]. Metals and Materials International, 2016, 22(2): 222–228. DOI: https://doi.org/10.1007/s12540-016-5504-0.
ZHANG Meng-han, LIU Sheng-dan, JIANG Jing-yu, et al. Effect of Cu content on quenching sensitivity relative to exfoliation corrosion susceptibility of Al-Zn-Mg-(Cu) alloys [J]. Materials Characterization, 2022, 194: 112476. DOI: https://doi.org/10.1016/j.matchar.2022.112476.
LAVERNIA E J, SRIVATSAN T S, MOHAMED F A. Strength, deformation, fracture behaviour and ductility of aluminium-lithium alloys [J]. Journal of Materials Science, 1990, 25(2): 1137–1158. DOI: https://doi.org/10.1007/BF00585420.
BAI P C, ZHOU T T, LIU P Y, et al. Effects of lithium addition on precipitation in Li-containing Al-Zn-Mg-Cu alloy [J]. Materials Letters, 2004, 58(24): 3084–3087. DOI: https://doi.org/10.1016/j.matlet.2004.05.048.
WEI Fang, LI Jin-shan, HU Rui, et al. Influence of 1.0 wt% Li on precipitates in Al-Zn-Mg-Cu alloy [J]. Chinese Journal of Aeronautics, 2008, 21(6): 565–570. DOI: https://doi.org/10.1016/s1000-9361(08)60175-2.
SODERGREN A, LLOYD D J. The influence of lithium on the ageing of A 7000 series alloy [J]. Acta Metallurgica, 1988, 36(8): 2107–2114. DOI: https://doi.org/10.1016/0001-6160(88)90312-4.
LIU Sheng-dan, ZHONG Qi-min, ZHANG Yong, et al. Investigation of quench sensitivity of high strength Al-Zn-Mg-Cu alloys by time-temperature-properties diagrams [J]. Materials and Design, 2010, 31(6): 3116–3120.
DING Xue-feng, LIU Wen-hui, JIANG Bo, et al. Effect of large pre-deformation on microstructure and mechanical properties of 7B52 laminated aluminum alloy [J]. Journal of Alloys and Compounds, 2023, 967: 171749. DOI: https://doi.org/10.1016/j.jallcom.2023.171749.
CHEN Y Q, XU J B, PAN S P, et al. Effects of initial orientation on microstructure evolution of aluminum single crystals during hot deformation [J]. Materials Science and Engineering A, 2023, 883: 145502. DOI: https://doi.org/10.1016/j.msea.2023.145502.
JIA Dong-sheng, HE Tao, SONG Miao, et al. Microstructure evolution of 7050 Al alloy fasteners during cold upsetting after equal channel angular pressing [J]. Journal of Central South University, 2023, 30(11): 3682–3695. DOI: https://doi.org/10.1007/s11771-023-5464-8.
LI Shuai, DONG Hong-gang, LI Peng, et al. Effect of repetitious non-isothermal heat treatment on corrosion behavior of Al-Zn-Mg alloy [J]. Corrosion Science, 2018, 131: 278–289. DOI: https://doi.org/10.1016/j.corsci.2017.12.004.
DENG Ying, YIN Zhi-min, ZHAO Kai, et al. Effects of Sc and Zr microalloying additions and aging time at 120 °C on the corrosion behaviour of an Al-Zn-Mg alloy [J]. Corrosion Science, 2012, 65: 288–298. DOI: https://doi.org/10.1016/j.corsci.2012.08.024.
LIU Sheng-dan, WANG Qing, YANG Zhen-shen, et al. Effect of minor Ge addition on microstructure and localized corrosion behavior of Al-Zn-Mg alloy sheet [J]. Materials Characterization, 2019, 156: 109837. DOI: https://doi.org/10.1016/j.matchar.2019.109837.
KEDDAM M, KUNTZ C, TAKENOUTI H, et al. Exfoliation corrosion of aluminium alloys examined by electrode impedance [J]. Electrochimica Acta, 1997, 42(1): 87–97. DOI: https://doi.org/10.1016/0013-4686(96)00170-3.
LU Xiang-han, HAN Xiao-lei, DU Zhi-wei, et al. Effect of microstructure on exfoliation corrosion resistance in an Al-Zn-Mg alloy [J]. Materials Characterization, 2018, 135: 167–174. DOI: https://doi.org/10.1016/j.matchar.2017.11.029.
KNIGHT S P, BIRBILIS N, MUDDLE B C, et al. Correlations between intergranular stress corrosion cracking, grain-boundary microchemistry, and grain-boundary electrochemistry for Al-Zn-Mg-Cu alloys [J]. Corrosion, 2010, 52(12): 4073–4080. DOI: https://doi.org/10.1016/j.corsci.2010.08.024.
MARLAUD T, MALKI B, HENON C, et al. Relationship between alloy composition, microstructure and exfoliation corrosion in Al-Zn-Mg-Cu alloys [J]. Corrosion Science, 2011, 53(10): 3139–3149. DOI: https://doi.org/10.1016/j.corsci.2011.05.057.
PORTER D A, EASTERLING K E, SHERIF M Y. Phase transformations in metals and alloys [M]. 3rd ed. Boca Raton, FL: CRC Press, 2009.
LI J F, ZHENG Z Q, LI S C, et al. Simulation study on function mechanism of some precipitates in localized corrosion of Al alloys [J]. Corrosion Science, 2007, 49(6): 2436–2449. DOI: https://doi.org/10.1016/j.corsci.2006.12.002.
LIU Sheng-dan, LI Cheng-bo, DENG Yun-lai, et al. Influence of grain structure on quench sensitivity relative to localized corrosion of high strength aluminum alloy [J]. Materials Chemistry and Physics, 2015, 167: 320–329. DOI: https://doi.org/10.1016/j.matchemphys.2015.10.051.
MCNAUGHTAN D, WORSFOLD M, ROBINSON M J. Corrosion product force measurements in the study of exfoliation and stress corrosion cracking in high strength aluminium alloys [J]. Corrosion Science, 2003, 45(10): 2377–2389. DOI: https://doi.org/10.1016/s0010-938x(03)00050-7.
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The overarching research goals were developed by JIANG Ke-da and LIU Sheng-dan. LIAO Ze-xin and CHEN Ming-yang conducted the literature review. LIAO Ze-xin, TANG Jian-guo and LIU Sheng-dan analyzed the measured data. The initial draft of the manuscript was written by JIANG Ke-da, LIAO Ze-xin and LIU Sheng-dan. All authors replied to reviewers’ comments and revised the final version.
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JIANG Ke-da, LIAO Ze-xin, CHEN Ming-yang, LIU Sheng-dan and TANG Jian-guo declare that they have no conflict of interest.
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Foundation item: Project(202302AB080024) supported by the Major Science and Technology Projects of the Science and Technology Department of Yunnan Province, China; Project(U21A20130) supported by the National Natural Science Foundation of China
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Jiang, Kd., Liao, Zx., Chen, My. et al. Impact of cooling rate on exfoliation corrosion resistance of a Li-containing 7xxx aluminum alloy. J. Cent. South Univ. 31, 2225–2236 (2024). https://doi.org/10.1007/s11771-024-5702-8
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DOI: https://doi.org/10.1007/s11771-024-5702-8