为评价7075铝合金板材的可时效成形性并掌握最佳的时效成形工艺参数，基于机械加载时效成形试验工装，开展了时效温度和时间对7075铝合金板材时效成形后构件力学性能和物理性能影响的试验研究．结果表明：7075铝合金板材的时效成形性与工艺参数密切相关，随着时效温度和时间的增大，板材的电导率呈升高趋势，而其拉伸性能则呈降低趋势；且合金的拉伸断裂方式与时效状态有关，过时效初期以沿晶韧窝和穿晶韧窝混合型断裂为主，随着过时效进行主要为韧窝断裂．综合考虑构件时效成形后拉伸性能和电导率等情况，合金最佳时效温度为180℃，且保温时间不宜长于16 h．
In order to evaluate the formability of AA7050 aluminium alloy sheets during the creep age forming and to optimize the best creep age forming parameters, series of experimental studies were carried out. The influences of ageing temperature and ageing time were investigated by examining the mechanical and physical properties of samples. The results indicated that the creep age forming formability of 7075 aluminum alloy sheets are greatly affected by the processing parameters. With the increasing of ageing temperature and ageing time, the electrical conductivity tends to increase, while the tensile strength decreases. Furthermore, the alloy fracture mode is associated with ageing conditions. At the early over?aged stage, the material fractured through a mixed mode of transgranular and intergranular fracture, especially the trend of dimple fracture increases under over?aged stages. By evaluating the tensile strength and electrical conductivity of the deformed samples, the best performance was achieved by ageing up to 16 hours at 180℃.
参考文献
| [1] | HEINZ A;HASZLER A;KEIDEL C et al.Recent development in aluminum alloys for aerospace applications[J].Materials Science and Engineering A,2000,280(1):102-107. |
| [2] | James C. Williams;Edgar A. Starke Jr. .Progress in structural materials for aerospace systems[J].Acta materialia,2003(19):5775-5799. |
| [3] | T. Marlaud;B. Baroux;A. Deschamps .Understanding the Compromise between Strength and Exfoliation Corrosion in High Strength 7000 Alloys[J].Materials Science Forum,2006(Pt.1):455-460. |
| [4] | WLOKA J;HACK T;VIRTANEN S .Influence of temper and surface condition on the exfoliation behavior of high strength Al-Zn-Mg-Cu alloys[J].Corrosion Science,2007,49(3):1437-1449. |
| [5] | 曾元松,黄遐,黄硕.蠕变时效成形技术研究现状与发展趋势[J].塑性工程学报,2008(03):1-8. |
| [6] | HOLMAN M C .Autoclave age forming large aluminum aircraft panels[J].Journal of Mechanical Working and Technology,1989,20(9):477-488. |
| [7] | 曾元松,黄遐.大型整体壁板成形技术[J].航空学报,2008(03):721-727. |
| [8] | ZHAN L H;LIN J G;DEAN T A .A review of the development of creep age forming:Experimentation,modeling and applications[J].INTERNATIONAL Journal OF MACHINE TOOLS & MANUFACTURE,2011,51(1):1-17. |
| [9] | SALLAH M J;PEDDIESON S;FOROUDASTAN A .Mathematical model of autoclave age forming[J].Journal of Materials Processing Technology,1991,28:211-219. |
| [10] | Narimetla SP.;Buchanan GR.;Foroudastan S.;Peddieson J. .A simple unified age forming model[J].Mechanics research communications,2000(6):631-636. |
| [11] | S. P. Narimetla;J. Peddieson Jr.;G. R. Buchanan;S. Foroudastan .A simulation procedure for panel age forming[J].Journal of engineering materials and technology,1998(2):183-190. |
| [12] | Arabi Jeshvaghani, R.;Emami, M.;Shahverdi, H.R.;Hadavi, S.M.M. .Effects of time and temperature on the creep forming of 7075 aluminum alloy: Springback and mechanical properties[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2011(29/30):8795-8799. |
| [13] | 宁爱林,曾苏民.时效制度对7B04铝合金组织和性能的影响[J].中国有色金属学报,2004(06):922-927. |
| [14] | 贾科;潘清林 .单级时效对7050铝合金力学性能及晶间腐蚀性能的影响[J].材料热处理技术,2012,41(22):194-197. |
| [15] | 湛利华,贾树峰,张姣.电脉冲时效对7075铝合金组织和性能的影响[J].中国有色金属学报,2014(03):600-605. |
| [16] | A.W.Zhu;J.Chen .Precipitation Strengthening of Stress-Aged Al-XCu Alloys[J].Acta materialia,2000(9):2239-2246. |
| [17] | A. W. ZHU;E. A. STARKE Jr. .STRESS AGING OF Al-xCu ALLOYS: EXPERIMENTS[J].Acta materialia,2001(12):2285-2295. |
| [18] | GB/T 228-2002.金属材料室温拉伸试验方法[S].北京:中国标准出版社,2002. |
| [19] | 陈愿情,邓运来,万里,晋坤,肖政兵.蠕变时效对7050铝合金板材组织与性能的影响[J].材料工程,2012(01):71-76. |
| [20] | 宋仁国.高强度铝合金的研究现状及发展趋势[J].材料导报,2000(01):20-21,34. |
| [21] | 李红,曾元松.时效处理对7050T451合金组织及性能的影响[J].塑性工程学报,2013(02):116-121. |
| [22] | 郑子樵,李红英,莫志民.一种7055型铝合金的RRA处理[J].中国有色金属学报,2001(05):771-776. |
| [23] | 樊喜刚 .Al-Zn-Mg-Cu-Zr合金组织性能和断裂行为的研究[D].哈尔滨工业大学,2007. |
| [24] | M.J. STARINK;X.M. LI .A Model for the Electrical Conductivity of Peak-Aged and Overaged Al-Zn-Mg-Cu Alloys[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,2003(4):899-911. |
| [25] | 王学书,聂波,谢延翠.热处理制度对7075铝合金电导率的影响[J].轻合金加工技术,2001(07):40-42,49. |
| [26] | 张钰.浅谈Al-Zn-Mg系合金[J].铝加工,2014(02):49-53. |
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