Baghdadi Amir Hossein, Sajuri Zainuddin, Keshtgar Azadeh, Mohd Sharif Nurulakmal, Rajabi Armin
Department of Mechanical and Manufacturing Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, UKM, Bangi 43600, Selangor, Malaysia.
School of Materials & Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia, Nibong Tebal 14300, Pulau Pinang, Malaysia.
Materials (Basel). 2021 Dec 31;15(1):288. doi: 10.3390/ma15010288.
The 5083 and 6061(T6) aluminum (Al) alloys are widely used in transportation industries and the development of structural designs because of their high toughness and high corrosion resistance. Friction stir welding (FSW) was performed to produce the dissimilar welded joint of Al5083-Al 6061(T6) under different welding parameters. However, softening behavior occurred in the friction stir welded (FSWed) samples because of grain coarsening or the dissolution of precipitation-hardening phases in the welding zone. Consequently, this research intended to investigate the effect of the post-weld heat treatment (PWHT) method on the mechanical property improvement of the dissimilar FSWed Al5083-Al6061(T6) and governing abnormal grain growth (AGG) through different welding parameters. The results showed PWHT enhanced the mechanical properties of dissimilar joints of Al5083-Al6061(T6). AGG was obtained in the microstructure of PWHTed joints, but appropriate PWHT could recover the dissolved precipitation-hardening particle in the heat-affected zone of the as-welded joint. Further, the tensile strength of the dissimilar joint increased from 181 MPa in the as-welded joint to 270 MPa in the PWHTed joint, showing 93% welding efficacy.
5083和6061（T6）铝合金因其高韧性和高耐腐蚀性而广泛应用于运输行业和结构设计领域。采用搅拌摩擦焊（FSW）在不同焊接参数下制备Al5083 - Al 6061（T6）异种焊接接头。然而，由于焊接区晶粒粗化或沉淀强化相溶解，搅拌摩擦焊（FSWed）试样出现软化现象。因此，本研究旨在探讨焊后热处理（PWHT）方法对异种搅拌摩擦焊Al5083 - Al6061（T6）力学性能改善的影响，并通过不同焊接参数控制异常晶粒长大（AGG）。结果表明，PWHT提高了Al5083 - Al6061（T6）异种接头的力学性能。在焊后热处理接头的微观结构中出现了AGG，但适当的PWHT可以使焊态接头热影响区中溶解的沉淀强化颗粒重新析出。此外，异种接头的抗拉强度从焊态接头的181MPa提高到焊后热处理接头的270MPa，焊接效率达93%。
