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Combined strengthening mechanism of solid-state bonding and mechanical interlocking in friction self-piercing riveted AA7075-T6 aluminum alloy joints

引用

Journal of Materials Science & Technology 2022年第10期105卷 109-121页

作者： Yunwu Ma Bingxin Yang Shanqing Hu He Shan Peihao Geng Yongbing Li Ninshu Ma Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Mechanical System and Vibration School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China Joining and Welding Research Institute Osaka UniversityOsaka 567-0047Japan

A recently developed friction self-piercing riveting(F-SPR)technique based on the combination of fric-tion stir processing and riveting has been reported to possess both solid-state bonding and mechanical fastening ***,there is still a lack of quantitative understanding of the hybrid en-hancement mechanism,hindering its engineering *** fill in this gap,the current research investigated the microstructure evolution,microhardness distribution,and miniature-tensile performance of the aluminum alloy AA7075-T6 F-SPR joints by *** accurate numerical simulation model was established to quantitatively evaluate the individual contributions of microstructure,local bonding strength,and macro interlocking to the performance of the joint,which could well explain the experi-mental *** was found that due to the friction stirring of the rivet,solid-state bonding driven by dynamic recrystallization is realized between the trapped aluminum in the rivet cavity and the bottom aluminum *** solid-state bonding zone has 75%yield strength,81%ultimate tensile strength,and 106%elongation compared to the base *** solid-state bonding enables the internal interlock-ing between the trapped aluminum and the rivet to withstand the additional load,which forms a novel dual-interlock fastening mechanism and increases the peak cross-tension force by 14.3%compared to the single-interlock joint.

关键词： Combined strengthening Friction self-piercing riveting miniature tensile test Solid-state joining Dual-interlocking Numerical simulation

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