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Microstructure and mechanical properties of friction pull plug welding for2219-T87 aluminum alloy with tungsten inert gas weld

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International Journal of Minerals,Metallurgy and Materials 2022年第6期29卷 1216-1224页

作者： Zhen Shao Lei Cui Lijun Yang Peng Lu Huimiao Wang Zhuanping Sun Jianling Song Tianjin Key Laboratory of Advanced Joining Technology School of Materials Science and EngineeringTianjin UniversityTianjin 300350China Tianjin Space Launch Vehicle Manufacturing Co.Ltd Tianjin 300457China

The friction pull plug welding(FPPW)of the 2219-T87 tungsten inert gas(TIG)welded joint was investigated,and the microstructures,precipitate evolution,mechanical properties,and fracture morphologies of this joint were analyzed and *** this study,defectfree joints were obtained using a rotational speed of 7000 r/min,an axial feeding displacement of 12 mm,and an axial force of 20-22 *** results indicated that within these welding parameters,metallurgical bonding between the plug and plate is achieved by the formation of recrystallized *** microstructural features of the FPPW joint can be divided into different regions,including the heat-affected zone(HAZ),thermomechanically affected zone(TMAZ),recrystallization zone(RZ),heat-affected zone in the TIG weld(TIG-HAZ),and the thermomechanically affected zone in the TIG weld(TIG-TMAZ).In the TIG-TMAZ,the grains were highly deformed and elongated due to the shear and the extrusion that produces the plug during the FPPW *** main reason for the softening in the TMAZ is determined to be the dissolution ofθ’and coarsening ofθprecipitate *** a tensile test,the FPPW joint welded with an axial force of 22 kN showed the highest ultimate tensile strength of 237 *** locations of cracks and factures in the TIG-TMAZ were *** fracture morphology of the tensile sample showed good plasticity and toughness of the joints.

关键词： friction pull plug welding tungsten inert gas weld microstructures constituent particles mechanical properties

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Characterization of pitting corrosion of 7A60 aluminum alloy by EN and EIS techniques

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Transactions of Nonferrous Metals Society of China 2014年第12期24卷 3907-3916页

作者：王学慧王吉会付丛伟天津大学水利工程仿真与安全国家重点实验室天津300072 天津大学材料科学与工程学院天津复合与功能材料重点实验室天津300072

The pitting corrosion behaviors of 7A60 aluminum alloy in the retrogression and re-aging （RRA） temper were investigated by electrochemical impedance spectroscopy （EIS） and electrochemical noise （EN） techniques, and the microstructure and the second phase content of the alloy were observed and determined by scanning electron microscopy （SEM） and energy dispersive spectrometer （EDS）. The results show that there exist two different corrosion stages for 7A60 alloy in 3.5%NaCl solution, and the corrosion process can be detected by the appearance of EIS spectrum with two capacitive time constants and the wavelet fractal dimension D extracted from EN. SEM and EDS results also demonstrate that severe pitting corrosion in 7A60 alloy is mainly caused by electrochemical active MgZn2 particles, secondly by Al2MgCu and Mg2Si. Al7Cu2Fe particles make little contribution to the pitting corrosion of 7A60 alloy.

关键词： 7A60 aluminum alloy constituent particles pitting corrosion electrochemical impedance spectroscopy electrochemical noise wavelet fractal dimension

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