采用硬度、电导率、力学拉伸、慢应变速率拉伸试验及透射电镜等测试分析方法，研究双级时效对7085铝合金组织和性能的影响。结果表明：预时效热处理主要析出相为GP 区和η′相，预时效时间对合金硬度和电导率的影响较小。随着第二级时效时间的延长，合金的抗拉强度和屈服强度先增大后减小，电导率和抗应力腐蚀性能提高，晶界析出相由连续分布变为非连续分布。第二级时效温度越高，合金强度随时效时间的延长，降低得越显著。采用(110℃,6 h)+(160℃,12 h)双级时效热处理，合金的抗拉强度、屈服强度、伸长率及电导率分别为515 MPa、487MPa、11.7%、38%(IACS)。
The effect of two-step aging treatment on microstructure and properties of 7085 aluminum alloy was investigated by hardness, conductivity, mechanical testing, slow strain rate testing and transmission electron microscopy. The results show that the GP zones andη′phase are the mainly precipitation phases of pre-aging, and the pre-aging time is less impact on the hardness and electrical conductivity. The strength after two-step aging process first increases, and then decreases, while the ability of stress corrosion resistance increases with the extension of the second step of aging time. With the size of grain boundary precipitates coarsening, and the distribution of grain boundary precipitates from continuous to non-continuous. The strength of the alloy significantly decreases with the increases of the second step aging temperature. The optimal of the two-step aging process is (110℃, 6 h)+(160℃, 12 h), the tensile strength, yield strength, elongation and conductivity of alloy are 515 MPa, 487 MPa, 11.7%, 38%(IACS), respectively.
参考文献
| [1] | JAMES T S;JOHN L;WARREN H H Jr .Aluminum alloys for aero-structures[J].Advanced Materials and Processes,1997,152(04):17-20. |
| [2] | HEINZ A;HASZLER A;KEIDEL C .Recent development in aluminum alloys for aerospace applications[J].Materials Science and Engineering A,2000,280(03):102-107. |
| [3] | JOHN L .Advanced aluminum and hybrid aero-structure for future aircraft[J].Materials Science Forum,2006,519/521:1233-1238. |
| [4] | M. E. Karabin;F. Barlat;R. W. Schultz .Numerical and experimental study of the cold expansion process in 7085 plate using a modified split sleeve[J].Journal of Materials Processing Technology,2007(1/3):45-57. |
| [5] | CHAKRABARTI D J;LIU J;SAWTELL R R;VENEMAV G B .New generation high strength high damage tolerance 7085 thick alloy product with low quench sensitivity[J].Materials Forum,2004,28:969-974. |
| [6] | 肖代红,巢宏,陈康华,黄伯云.微量Sc对AA7085铝合金组织与性能的影响[J].中国有色金属学报,2008(12):2145-2150. |
| [7] | 熊柏青,李锡武,张永安,李志辉,朱宝宏,王锋,刘红伟.新型高强韧低淬火敏感性Al-7.5Zn-1.65Mg-1.4Cu-0.12Zr合金[J].中国有色金属学报,2009(09):1539-1547. |
| [8] | LI XiWu,XIONG BaiQing,ZHANG YongAn,HUA Cheng,WANG Feng,ZHU BaoHong,LIU HongWei.Effect of one-step aging on microstructure and properties of a novel Al-Zn-Mg-Cu-Zr alloy[J].中国科学E辑（英文版）,2009(01):67-71. |
| [9] | CHEN Song-yi;CHEN Kang-hua;CHEN Xue-hai;CENG Qing-hua .Effect of heat treatment on hot deformation behavior and microstructure evolution of 7085 aluminum alloy[J].Journal of Alloys and Compounds,2012,537(10):338-345. |
| [10] | 陈送义,陈康华,贾乐,彭国胜.热变形条件对7085铝合金晶粒结构和性能的影响[J].中国有色金属学报（英文版）,2013(02):329-334. |
| [11] | 肖代红,陈康华,罗伟红.固溶热处理对AA7085铝合金组织与性能的影响[J].稀有金属材料与工程,2010(03):494-497. |
| [12] | CHEN Song-yi;CHEN Kang-hua;JIA Le;DONG Peng-xuan .Effect of heat treatment on strength,exfoliation corrosion and electrochemical behavior of 7085 aluminum alloy[J].Materials and Design,2012,35(03):93-98. |
| [13] | 陈送义,陈康华,董朋轩,叶升平,黄兰萍.热处理对7085铝合金应力腐蚀开裂、断裂韧性和强度的影响[J].中国有色金属学报（英文版）,2014(07):2320-2325. |
| [14] | Jing-Chie Lin;Hsueh-Lung Liao;Wern-Dare Jehng;Chih-Horng Chang;Sheng-Long Lee .Effect of heat treatments on the tensile strength and SCC-resistance of AA7050 in an alkaline saline solution[J].Corrosion Science: The Journal on Environmental Degradation of Materials and its Control,2006(10):3139-3156. |
| [15] | A.F. Oliveira Jr.;M.C. de Barros;K.R. Cardoso;D.N. Travessa .The effect of RRA on the strength and SCC resistance on AA7050 and AA7150 aluminium alloys[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2004(1/2):321-326. |
| [16] | KNIGHT S P;BIRBILIS N;MUDDLE B C .Correlations between intergranular stress corrosion cracking,grain-boundary microchemistry,and grain-boundary electrochemistry for Al-Zn-Mg-Cu alloys[J].Corrosion Science,2010,52(12):4073-4080. |
| [17] | D.Wang;D.R. Ni;Z.Y. Ma .Effect of pre-strain and two-step aging on microstructure and stress corrosion cracking of 7050 alloy[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2008(1/2):360-366. |
| [18] | N.Q. Chinh;J. Lendvai;D.H. Ping .The effect of Cu on mechanical and precipitation properties of Al-Zn-Mg alloys[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2004(1/2):52-60. |
| [19] | T. Marlaud;A. Deschamps;F. Bley .Influence of alloy composition and heat treatment on precipitate composition in Al-Zn-Mg-Cu alloys[J].Acta materialia,2010(1):248-260. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%