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Enhanced Fatigue Properties of 2219 Al Alloy Joints via bobbin tool friction stir welding

Acta Metallurgica Sinica(English Letters) 2023年第4期36卷 586-596页

作者： Zhenlin Wang Beibei Wang Zhen Zhang Peng Xue Yunfei Hao Yanhua Zhao Dingrui Ni Guoqing Wang Zongyi Ma Shi‑Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China China Academy of Launch Vehicle Technology Beijing 100076China Capital Aerospace Machinery Company Beijing 100076China

In the present study,2219-T87 Al alloy plates,4 mm in thickness,were subjected to bobbin tool friction stir welding(BTFSW)under relatively high welding speeds of 200 and 400 mm/min,with the aim to analyze the effect of welding speeds on fatigue properties of the *** results showed that the tension–tension high-cycle fatigue performance of the BT-FSW joints at room temperature was significantly enhanced compared to that of other joints of 2xxx series Al alloys *** at a high welding speed of 400 mm/min,the fatigue strength of the joint reached 78%of the base material together with a high tensile strength of 311 *** was found that the joint line remnants had no effects on the fatigue properties of the BT-FSW joints due to the elimination of root flaws under the action of the lower *** of the samples with the welding speed of 200 mm/min failed at the thermo-mechanical zone(TMAZ)during fatigue tests,attributable to the coarsened grains and precipitates,but all of the samples with high welding speed of 400 mm/min randomly failed at the nugget zone due to the improved hardness value in the TMAZ.

关键词： 2219 Al alloys bobbin tool friction stir welding Microstructure Fatigue properties

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Assessing the Bonding Interface Characteristics and Mechanical Properties of bobbin tool friction stir Welded Dissimilar Aluminum Alloy Joints

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Acta Metallurgica Sinica(English Letters) 2021年第1期34卷 125-134页

作者： Quan Wen Wenya Li Vivek Patel Luciano Bergmann Benjamin Klusemann Jorge F.dos Santos State Key Laboratory of Solidifi cation Processing Shaanxi Key Laboratory of Friction Welding TechnologiesNorthwestern Polytechnical UniversityXi’an 710072China Institute of Materials Research Materials MechanicsSolid-State Joining ProcessesHelmholtz-Zentrum GeesthachtMax-Planck-Straße 121502 GeesthachtGermany Institute of Product and Process Innovation Leuphana University of LüneburgUniversitätsallee 121335 LüneburgGermany

This study focuses on the bonding interface characteristics and mechanical properties of the bobbin tool friction stir welded dissimilar AA6056 and AA2219 aluminum alloy joints using diff erent welding *** arise solely in the stir zone at the AA2219 side.A distinct boundary with limited material mixing develops at the middle section of the bonding interface,while excellent material mixing with an irregularly jagged pattern forms at the top and bottom sections of the bonding *** the welding speed,the material mixing is rarely changed at the middle section in comparison with the bottom ***,a small diff erence between Guinier–Preston dissolution and Q phase precipitation leads to rare change of hardness in the heat aff ected zone(HAZ)at the AA6056 *** increased hardness of the HAZ at the AA2219 side is attributed to avoidance of the dissolution ofθ’’phase precipitates.A maximum tensile strength of 181 MPa is obtained at 300 mm *** occur at the AA6056 side near the top and bottom surfaces and at the bonding interface in the middle section of the *** regions close to the top and bottom surfaces of the joints show a better ductility.

关键词： bobbin tool friction stir welding Dissimilar aluminum alloy Bonding interface Precipitation Mechanical property

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