通过硬度测试、极化曲线测试、腐蚀浸泡和慢应变速率拉伸方法研究Al-Zn-Mg-Sc-Zr合金板材搅拌摩擦焊接接头的力学性能和局部腐蚀性能，并利用金相显微镜和透射电镜对焊接接头的显微组织进行分析。结果表明：焊接接头的硬度曲线呈现 W 型，硬度最低值出现在热影响区与热机影响区的交界处；和母材相比，焊接接头的局部抗腐蚀性能降低，应力腐蚀敏感性增大。热机影响区的腐蚀电位最低，腐蚀电流密度最高，晶间腐蚀深度最大，抗腐蚀性能最差。热机影响区的硬度和腐蚀性能的降低，主要是由于该区的晶粒发生变形，大部分η′沉淀强化相溶解，晶界上分布着大量的η相。
The mechanical properties and localized corrosion of Al-Zn-Mg-Sc-Zr alloy friction stir welded joint were investigated by hardness testing, polarization curve testing, corrosion immersion testing and slow strain rate tensile testing. Moreover, the microstructure of the welded joint was characterized by optical microscopy and the transmission electron microscopy. The results show that the hardness curve of the welded joint exhibits “W” shape, and the lowest hardness appears in the transition zone between heat affected zone(HAZ) and thermo-mechanical affected zone (TMAZ). Compared with the base material, the localized corrosion resistance of the welded joint decreases, and the stress corrosion cracking susceptibility increases. The TMAZ exhibits the lowest corrosion potential, the highest current density, the largest intergranular corrosion depth and the lowest corrosion resistance. During welding, mostη′phase dissolves and a number ofη phase is located at grain boundaries in the grains of TMAZ, which leads to the decrease of hardness and corrosion resistance.
参考文献
| [1] | A. Heinz;A. Haszler;C. Keidel;S. Moldenhauer;R. Benedictus;W. S. Miller .Recent development in aluminium alloys for aerospace applications[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2000(1):102-107. |
| [2] | J.F. Li;N. Birbilis;C.X. Li .Influence of retrogression temperature and time on the mechanical properties and exfoliation corrosion behavior of aluminium alloy AA7150[J].Materials Characterization,2009(11):1334-1341. |
| [3] | 彭小燕,曹晓武,段雨露,陈举飞,徐国富,尹志民.7020铝合金MIG焊焊接接头的组织与性能[J].中国有色金属学报,2014(04):912-918. |
| [4] | 姜锋 .Al-Mg-Sc中间合金制备及其应用研究[D].中南大学,2002. |
| [5] | 尹志民;潘清林;姜峰;李汉广.钪和含钪合金[M].长沙:中南大学出版社,2007:1-581. |
| [6] | O.N. Senkov;M.R. Shagiev;S.V. Senkova .Precipitation of Al_3(Sc,Zr) particles in an Al-Zn-Mg-Cu-Sc-Zr alloy during conventional solution heat treatment and its effect on tensile properties[J].Acta materialia,2008(15):3723-3738. |
| [7] | DENG Ying;YE Rui;XU Guo-fu;YANG Ji-dong PAN Qin-lin PENG Bing CAO Xiao-wu DUAN Yu-lu WANG Ying-jun LU Li-ying YIN Zhi-min .Corrosion behaviour and mechanism of new aerospace Al-Zn-Mg alloy friction stir welded joints and the effects of secondary Al3ScxZr1-x nanoparticles[J].Corrosion Science,2015,90:359-374. |
| [8] | THOMAS W M;NICHOLAS E D;NEEDHAM J C;MURCH M G TEMPLE S P DAWES C J .Friction stir butt welding[P].China,91259788,1991. |
| [9] | 王国庆;赵衍华.铝合金的摩擦搅拌焊接[M].北京:宇航出版社,2010:1-321. |
| [10] | 陈杰,张海伟,刘德佳,王小明.我国搅拌摩擦焊技术的研究现状与热点分析[J].电焊机,2011(10):92-97. |
| [11] | Jae-Cheul PARK,Min-Su HAN,Seok-Ki JANG,Seong-Jong KIM.异种铝合金摩擦焊接移动速度和旋转速度的优化[J].中国有色金属学报（英文版）,2011(07):1486-1490. |
| [12] | I.RADISAVLJEVIC,A.ZIVKOVIC,N.RADOVIC,V.GRABULOV.搅拌摩擦焊工艺参数对2024-T351铝合金搭接焊接头成形质量和力学性能的影响[J].中国有色金属学报（英文版）,2013(12):3525-3539. |
| [13] | M. Jariyaboon;A.J. Davenport;R. Ambat;B.J. Connolly;S.W. Williams;D.A. Price .The effect of welding parameters on the corrosion behaviour of friction stir welded AA2024-T351[J].Corrosion Science: The Journal on Environmental Degradation of Materials and its Control,2007(2):877-909. |
| [14] | D. A. Wadeson;X. Zhou;G. E. Thompson;P. Skeldon;L. Djapic Oosterkamp;G. Scamans .Corrosion behaviour of friction stir welded AA7108 T79 aluminium alloy[J].Corrosion Science,2006(4):887-897. |
| [15] | 张伟,邢远,贾志宏,杨晓芳,刘庆,朱昌洛.添加微量Sc、Zr对超高强铝合金微观结构和性能的影响[J].中国有色金属学报（英文版）,2014(12):3866-3871. |
| [16] | POUGET G;REYNOLDS A P .Residual stress and microstructure effects on fatigue crack growth in AA2050 friction stir welds[J].International Journal of Fatigue,2008,30(03):463-472. |
| [17] | Omar Hatamleh;Preet M. Singh;Hamid Garmestani .Corrosion Susceptibility Of Peened Friction Stir Welded 7075 Aluminum Alloy Joints[J].Corrosion Science: The Journal on Environmental Degradation of Materials and its Control,2009(1):135-143. |
| [18] | LI B;PAN Q L;ZHANG Z Y;LI C .Research on intercrystalline corrosion,exfoliation corrosion,and stress corrosion cracking of Al-Zn-Mg-Sc-Zr alloy[J].Materials and Corrosion,2013,64(07):592-598. |
| [19] | LUMSDEN J B;MAHONEY M W;RHODES C G;POLLOCK G A .Corrosion behavior of friction stir welded AA7050-T7651[J].CORROSION,2003,59(03):426-432. |
| [20] | TSAI T C;CHUANG T H .Role of grain size on the stress aluminum corrosion cracking of 7475 alloys[J].Materials Science and Engineering A,1997,225(01):135-144. |
| [21] | NAJJAR D;MAGNIN T;WARNER T J .Influence of critical surface defects and localized competition between anodic dissolution and hydrogen effects during stress corrosion cracking of a 7050 aluminium alloy[J].Materials Science and Engineering A,1997,238(01):293-302. |
| [22] | 邓英 .微量钪锆对高强耐蚀可焊铝锌镁合金组织和性能的影响[D].中南大学,2012. |
| [23] | D. A. Wadeson;X. Zhou;G. E. Thompson;P. Skeldon;L. Djapic Oosterkamp;G. Scamans .Corrosion behaviour of friction stir welded AA7108 T79 aluminium alloy[J].Corrosion Science,2006(4):887-897. |
| [24] | 张茁,陈康华,方华婵.微量Cr和Nb对Al-Zn-Mg-Cu-Zr合金力学性能和应力腐蚀性能的影响[J].中国有色金属学报,2008(06):985-990. |
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