T651态7075铝合金的显微组织与拉伸断裂机制
Microstructure and Tensile Fracture Mechanism of 7075-T651 Aluminum Alloy
摘 要
对7075铝合金进行了T651热处理, 研究了其显微组织、静载拉伸性能及断口形貌, 分析了其显微组织与断裂机制的关系。结果表明: T651态7075铝合金具有较高的屈强比, 抗拉强度和屈服强度分别为529, 450 MPa; 该合金中存在大量细小的MgZn2析出相, 同时还存在粗大的Al7Cu2Fe夹杂物和富含硅的硬脆相; 在拉伸应力的作用下, MgZn2析出相则倾向于沿界面脱粘形成微孔, Al7Cu2Fe等夹杂物易引发局部应力集中使夹杂物颗粒开裂, 最终使合金以微孔聚合型方式断裂。
T651热处理
显微组织
断裂机制
7075 aluminum alloy
T651 heat treatment
microstructure
fracture mechanism
Abstract
T651 heat treatment was conducted on 7075 aluminum alloy. Then the microstructure, static tensile properties and fracture morphology of the alloy were investigated and the relationship between the microstructure and fracture mechanism was analyzed. The results show that the tensile yield ratio of the 7075-T651 aluminum alloy was relatively high and the tensile and yield strength was 529, 450 MPa respectively. A large number of fine MgZn2 precipitates existed in the alloy, meanwhile coarse Al7Cu2Fe inclusions and Si-rich hard phase were also observed. Under the tensile stress, the MgZn2 precipitate was apt to debond along the interface, resulting in the formation of micro-voids; the inclusions such as Al7Cu2Fe were prone to cause local stress concentration, which led to cracking of the inclusion particles, finally resulting in the micro-void coalescence fracture of the alloy.
中图分类号 TG13 DOI 10.11973/jxgccl201611008
所属栏目 试验研究
基金项目 国家自然科学基金资助项目(51201054); 第51批博士后基金资助项目(2012M511400); 教育部博士点基金资助项目(20120111120030)
收稿日期 2015/4/13
修改稿日期 2016/8/8
网络出版日期
作者单位点击查看
备注李慧(1990-), 女, 安徽亳州人, 硕士研究生。
引用该论文: LI Hui,CHEN Tao,ZHAO Lu-yuan,HUANG Jun,WU Yu-cheng. Microstructure and Tensile Fracture Mechanism of 7075-T651 Aluminum Alloy[J]. Materials for mechancial engineering, 2016, 40(11): 38～43
李 慧,陈 涛,赵路远,黄 俊,吴玉程. T651态7075铝合金的显微组织与拉伸断裂机制[J]. 机械工程材料, 2016, 40(11): 38～43
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【3】翁舒楚, 张辉, 李落星, 等. 7150铝合金在热压缩变形过程中的动态组织演变［J］. 机械工程材料, 2013, 37(5): 41-45.
【4】冯朝辉, 王少华, 胡兴华, 等. 第二级时效工艺对7050铝合金厚板组织及性能的影响［J］.机械工程材料,2011,35(5): 35-38.
【5】CHEN K H, FANG H C, ZHANG Z, et al. Effect of Yb, Cr and Zr additions on recrystallization and corrosion resistance of Al-Zn-Mg-Cu alloys［J］. Materials Science and Engineering A, 2008, 497(1/2): 426-431.
【6】DIXIT M, MISHRA R S, SANKARAN K K. Structure-property correlations in Al 7050 and Al 7055 high-strength aluminum alloys［J］. Materials Science and Engineering A, 2008, 478(1): 163-172.
【7】CHEN S Y, CHEN K H, DONG P X, et al. Effect of heat treatment on stress corrosion cracking, fracture toughness and strength of 7085 aluminum alloy［J］. Transactions of Nonferrous Metals Society of China, 2014, 24(7): 2320-2325.
【8】HAN N M, ZHANG X M, LIU S D, et al. Effects of pre-stretching and ageing on the strength and fracture toughness of aluminum alloy 7050［J］. Materials Science and Engineering A, 2011, 528(10): 3714-3721.
【9】ZHANG Z, CHEN K H, FANG H C, et al. Effect of Yb addition on strength and fracture toughness of Al-Zn-Mg-Cu-Zr aluminum alloy［J］. Transactions of Nonferrous Metals Society of China, 2008, 18: 1037-1042.
【10】SANTNER J S. A study of fracture in high purity 7075 aluminum alloys［J］. Metallurgical Transactions A, 1978, 9(6): 769-780.
【11】何昌德, 任建平, 徐兵, 等. 7050铝合金双级双峰时效沉淀相的析出过程及作用［J］. 机械工程材料, 2011, 35(6): 38-41.
【12】段佳琦, 尹志民, 赵凯, 等. 均匀化处理对铝锌镁钪合金组织和性能的影响［J］. 机械工程材料, 2012, 36(6): 34-37.
【13】王少华, 马志锋, 刘惠, 等. 铝锌镁铜锆钪合金型材的组织和性能［J］. 机械工程材料, 2014, 38(6): 60-65.
【14】ZHANG X M, LIU W J, LIU S D, et al. Effect of processing parameters on quench sensitivity of an AA7050 sheet［J］. Materials Science and Engineering A, 2011, 528(3): 795-802.
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【16】GAO M, FENG C R, WEI R P. An analytical electron microscopy study of constituent particles in commercial 7075-T6 and 2024-T3 alloys［J］. Metallurgical and Materials Transaction A, 1998, 29(4): 717-728.
【17】HONO K, SANO N, SAKURAI T. Quantitative atom-probe analysis of some aluminum alloys［J］. Surface Science, 1992, 266(1): 350-357.
【18】MALONEY S K, HONO K, POLMEAR I J, et al. The chemistry of precipitates in an aged Al-2.1Zn-1.7Mg at.% alloy［J］. Scripta Materialia, 1999, 41(10): 1031-1038.
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【20】GJONNES J, SIMENSEN J. An electron microscope investigation of the microstructure in an aluminium-zine-magnesium alloy［J］. Acta Metallurgica, 1970, 18: 881-884.
【21】ZHAO Y H, LIAO X Z, JIN Z, et al. Microstructures and mechanical properties of ultrafine grained 7075Al alloy processed by ECAP and their evolutions during annealing ［J］.Acta Materialia, 2004, 52: 4589-4599.
【22】MORGENEYER T F, STARINK M J, SINCLAIR I. Evolution of voids during ductile crack propagation in an aluminium alloy sheet toughness test studied by synchrotron radiation computed tomography［J］. Acta Materialia, 2008, 56(8): 1671-1679.
【23】HAHN G T, ROSENFIELD A R. Metallurgical factors affecting fracture toughness of aluminium alloys［J］. Metallurgical Transactions A, 1975, 6(4): 653-668.
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