Strengthening mechanism in laser-welded 2219 aluminium alloy under the cooperative effects of aging treatment and pulsed electromagnetic loadings

Microstructure and Properties of 2219 Aluminum Alloy under Compound Technologies of Friction-Stir-Welding, Heat-Treatment and Electromagnetic Forming

“…Meanwhile, as a high-velocity forming method, EMF can increase the forming limit of material and improve the performance of the workpieces compared with conventional quasi-static forming technologies [7][8]. Thus, in the field of astronautic industry, there is a broad prospect for the application of the compound technology of FSW, heat treatment and EMF in the manufacturing of large-scale thin-wall parts [9]. FSW technology has been widely applied in the manufacture for large-scale parts of aluminum alloy, and there are extensive researches for the influences of processing parameters and the plastic flow behavior during FSW treatment.…”

Microstructure and Properties of Friction Stir Welded 2219 Aluminum Alloy under Heat Treatment and Electromagnetic Forming Process

“…Simultaneously, as a high-velocity forming method, electromagnetic forming (EMF) can increase the forming limit of material and improve the performance of the workpieces compared with conventional quasi-static forming technologies [7,8]. Thus, in the astronautic industry, there is significant potential for the application of these processing technologies in the manufacturing of large-scale, thin-wall parts [9].FSW technology, which can create solid bonding through the frictional effects of the tool shoulder and the stirring effect of the pin, has been widely applied in the manufacture for large-scale parts of aluminum alloys. Extensive research has been conducted as to the influence of processing parameters and the plastic flow behavior during FSW treatment.…”

“…A reduction of flow stress is observed when plastic deformation is electrically assisted [21], which is strongly associated with a rise in the material's temperature, caused by the Joule effect of electricity [22].Although the 2219 aluminum alloy proceeds through the entire processing flow of FSW, heat treatment, and EMF, there are many different evolutions in microstructure and properties which hardly appear in the conventional process. The thermal effect and the plastic flow during FSW treatment causes an expediting of precipitation during heat treatment, and the inhomogeneous structure of the welding joint will reduce the formability of 2219 aluminum alloy during the EMF process [9]. Thus, it is essential to study the cooperative effects of FSW, heat treatment, and EMF for the application of the 2219 aluminum alloy in the astronautic industry.This paper investigates the microstructure and properties of the 2219 aluminum alloy under different compound technologies of FSW and heat treatment through a tensile test and SEM to study the interaction and the optimum combination of FSW and heat treatment.…”

“…Simultaneously, as a high-velocity forming method, electromagnetic forming (EMF) can increase the forming limit of material and improve the performance of the workpieces compared with conventional quasi-static forming technologies [7,8]. Thus, in the astronautic industry, there is significant potential for the application of these processing technologies in the manufacturing of large-scale, thin-wall parts [9].…”

“…Although the 2219 aluminum alloy proceeds through the entire processing flow of FSW, heat treatment, and EMF, there are many different evolutions in microstructure and properties which hardly appear in the conventional process. The thermal effect and the plastic flow during FSW treatment causes an expediting of precipitation during heat treatment, and the inhomogeneous structure of the welding joint will reduce the formability of 2219 aluminum alloy during the EMF process [9]. Thus, it is essential to study the cooperative effects of FSW, heat treatment, and EMF for the application of the 2219 aluminum alloy in the astronautic industry.…”