林亮华,陈君,彭海健

• 1:东华理工大学机械与电子工程学院
• 2:东华理工大学江西省新能源工艺及装备工程技术研究中心

摘要(Abstract)：

采用电导率测试仪、恒载荷应力腐蚀试验、扫描电镜和透射电镜等研究了Al-Zn-Mg-Cu合金在不同过时效状态下的应力腐蚀行为，探讨合金电导率与抗应力腐蚀性能的关系，分析了析出相特征对合金应力腐蚀行为的影响机理。结果表明：电导率可作为评价Al-Zn-Mg-Cu合金应力腐蚀敏感性高低的性能指标；当电导率低于39%IACS时，随电导率的减小应力腐蚀敏感性急剧升高；当电导率高于39%IACS时，电导率越高，抗应力腐蚀性能越好。微观组织分析表明随二级时效温度的升高或时间的延长，晶内析出相尺寸逐渐增大，合金电导率随之升高，同时晶界上的粗大平衡相之间的间距增大，η相中的Cu含量升高，合金抗应力腐蚀性能提高。

关键词(KeyWords)： Al-Zn-Mg-Cu合金;电导率;应力腐蚀;过时效

Abstract:

Keywords:

基金项目(Foundation): 江西省自然科学基金(20202BAB214005);; 江西省新能源工艺及装备工程技术研究中心基金(JXNE2020-06)

作者(Author): 林亮华,陈君,彭海健

DOI: 10.13289/j.issn.1009-6264.2021-0496

参考文献(References)：

• [1] 邓运来，张新明.铝及铝合金材料进展[J].中国有色金属学报，2019,29(9):321-347.DENG Yun-lai,ZHANG Xin-ming.Progress in aluminum and aluminum alloy materials[J].The Chinese Journal of Nonferrous Metals,2019,29(9):321-347.
• [2] Altenbach C,Schnatterer C,Mercado U A,et al.Synchrotron-based holotomography and X-Ray fluorescence study on the stress corrosion cracking behavior of the peak-aged 7075 aluminum alloy[J].Journal of Alloys and Compounds,2020,817(1):152722.
• [3] Lin L,Liu Z,Ying P,et al.Improved stress corrosion cracking resistance and strength of a two-step aged Al-Zn-Mg-Cu alloy using Taguchi method[J].Journal of Materials Engineering and Performance,2015,24(12):4870-4877.
• [4] 张新明，宋丰轩，刘胜胆，等.双级时效对7050铝合金板材剥蚀性能的影响[J].中南大学学报(自然科学版),2011,42(8):2252-2259.ZHANG Xin-ming,SONG Feng-xuan,LIU Sheng-dan,et al.Influence of the two-step aging on exfoliation corrosion properties of 7050 aluminum alloy plate[J].Journal of Central South University(Science and Technology),2011,42(8):2252-2259.
• [5] Chemingui M,Khitouni M,Jozwiak K,et al.Characterization of the mechanical properties changes in an Al-Zn-Mg alloy after a two-step ageing treatment at 70 ℃ and 135 ℃[J].Materials and Design,2010,31(6):3134-3139.
• [6] 杨丽娟，祝贞凤，梁晓宁，等.时效时间对7150铝合金组织和性能的影响[J].材料热处理学报，2020,41(2):43-50.YANG Li-juan,ZHU Zhen-feng,LIANG Xiao-ning,et al.Effect of aging time on microstructure and properties of 7150 aluminum alloy[J].Transactions of Materials and Heat Treatment,2020,41(2):43-50.
• [7] Lin L,Liu Z,Han X,et al.Effect of overaging on fatigue crack propagation and stress corrosion cracking behaviors of an Al-Zn-Mg-Cu alloy thick plate[J].Journal of Materials Engineering and Performance,2018,27(8):3824-3830.
• [8] Schwarzenb?ck E,Ollivier E,Garner A,et al.Environmental cracking performance of new generation thick plate 7000-T7x series alloys in humid air[J].Corrosion Science,2020,171(1):108701.
• [9] Yuan D,Chen K,Chen S,et al.Enhancing stress corrosion cracking resistance of low Cu-containing Al-Zn-Mg-Cu alloys by slow quench rate[J].Materials and Design,2019,164(1):107558.
• [10] Magaji N,Mayrhofer R,Kr?ger B,et al.Comparison of test methods used to analyze stress corrosion cracking of differently tempered 7xxx alloys[J].Materials and Corrosion,2019,70(7):1192-1204.
• [11] 杨舜明，王岗，程元开.时效工艺对7020铝合金抗剥落腐蚀性能的影响[C]//第七届铝业加工技术论坛论文集，广州，2019:28-31.YANG Shun-ming,WANG Gang,CHENG Yuan-kai.Influence of aging process on exfoliation corrosion resistance of 7020 Al alloy[C]//The 7th Aluminum Processing Technology Forum Paper Collection,Guangzhou,2019:28-31.
• [12] 徐宁，王爽，冯小东，等.时效制度对Al-Zn-Mg-Cu合金性能的影响[J].铝加工，2018,5(1):58-61.XU Ning,WANG Shuang,FENG Xiao-dong,et al.Influence of aging systems on property of Al-Zn-Mg-Cu alloy[J].Aluminium Fabrication,2018,5(1):58-61.
• [13] Rout P K,Ghosh M M,Ghosh K S.Microstructural,mechanical and electrochemical behaviour of a 7017 Al-Zn-Mg alloy of different tempers[J].Materials Characterization,2015,104(1):49-60.
• [14] Vandersluis E,Ravindran C.Effects of solution heat treatment time on the as-quenched microstructure,hardness and electrical conductivity of B319 aluminum alloy[J].Journal of Alloys and Compounds,2020,838(1):155577.
• [15] 刘俊涛，张永安，李锡武，等.新型7056铝合金双级时效的显微组织和性能[J].中国有色金属学报，2016,26(9):1850-1857.LIU Jun-tao,ZHANG Yong-an,LI Xi-wu,et al.Microstructure and properties of two-step aged novel 7056 aluminum alloy[J].The Chinese Journal of Nonferrous Metals,2016,26(9):1850-1857.
• [16] Chen S,Li J,Hu G,et al.Effect of Zn/Mg ratios on SCC,electrochemical corrosion properties and microstructure of Al-Zn-Mg alloy[J].Journal of Alloys and Compounds,2018,757(1):259-264.
• [17] Wloka J,Hack T,Virtanen S.Influence of temper and surface condition on the exfoliation behaviour of high strength Al-Zn-Mg-Cu alloys[J].Corrosion Science,2007,49(3):1437-1449.
• [18] Peng G,Chen K,Chen S,et al.Influence of repetitious-RRA treatment on the strength and SCC resistance of Al-Zn-Mg-Cu alloy[J].Materials Science and Engineering A,2011,528(1):4014-4018.
• [19] Chen J,Zhang X,Zou L,et al.Effect of precipitate state on the stress corrosion behavior of 7050 aluminum alloy[J].Materials Characterization,2016,114(1):1-8.

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