Improved forming capability of 7075 aluminum alloy using electrically assisted electromagnetic forming

Forming Limit and Mechanical Properties of 2024-O Aluminum Alloy Under Electromagnetic Forming

Topological optimization of magnetic pulse welding coils with a connectivity-constrained particle swarm optimization algorithm

The 2024 aluminum alloys are used in a wide range of industrial applications, and improvement in their formability and serviceability is key in the manufacturing process. Electromagnetic forming (EMF) has proven to be an effective means of improving the formability of aluminum alloys. By combining EMF and heat treatment process, three samples of 2024 aluminum alloy were designed: Sample A (annealing + EMF + solid-solution + aging), Sample B (solid solution + EMF + aging), and Sample C (solid solution + pre-aging + EMF + aging). The effects of three heat treatment regimens on the properties and microstructure of 2024 aluminum alloy were studied by hardness test, intercrystalline corrosion, and exfoliation corrosion, as well as by microscopic characterization techniques including scanning electron microscopy and transmission electron microscopy. The results show that the dislocations-induced deformation could shorten the time to peak aging and led to the increase in peak strength. Sample C exhibited the highest strength and sample A exhibited the highest elongation and corrosion resistance. The microscopic results show that the differences in properties were mainly influenced by the distribution of precipitated phases and the width of the precipitation-free zone. This research has important implications for rational formulation based on the combination of EMF and heat treatment processes for the fabrication of Al−Cu−Mg alloys. 

Effect of electromagnetic forming–heat treatment process on mechanical and corrosion properties of 2024 aluminum alloy

The combination of electromagnetic forming (EMF) and heat treatment is expected to solve a series of forming problems of Al–Li alloys with high stiffness and low density, and to improve the material strength while avoiding the accuracy deviation of components caused by quenching distortion. This paper investigates the microscopic deformation behavior and clarifies the formability improvement mechanism of solid solution state 2195 Al–Li alloy (2195-SSS) in EMF with different forming voltages and strains by means of mechanical property test and microscopic characterization. The results show that the yield strength and tensile strength of 2195-SSS are 61% and 96% higher than those of annealed state, respectively, with a better work hardening rate. The elongation after fracture of EMF for 2195-SSS is 35%, which is 52% higher than that of quasi-static tensile. In the EMF process, dislocations are prone to multi-system cross slip and sub-grains or grains have a higher degree of rotation accompanied by a slight increase in grain size. EMF forms a uniformly distributed deformation sub-structure and improves the deformation coordination ability of grain boundaries, which disperses the strain localization and effectively improves the formability of 2195-SSS. Finally, the multi-physics coupling effects of the pulsed magnetic field, pulsed electric field and high strain rate on deformation behavior are further discussed. • Electromagnetic forming (EMF) settled some forming problems of solid solution state 2195 Al–Li alloy (2195-SSS). • The microscopic deformation mechanism of 2195-SSS in EMF was investigated. • EMF dispersed the strain localization and effectively improved the formability of 2195-SSS. • Materials were subjected to the multi-physics coupling in EMF. 

Deformation behavior and formability of solid solution state Al–Li alloy in electromagnetic forming

Enhanced formability and hardness of AA2195-T6 during electromagnetic forming

Improving the quality of Al-Fe tube joints manufactured via magnetic pulse welding using an inclined-wall field shaper

Electric-pulse triggered energetic materials forming (ETEF) is a high-speed manufacturing process, which utilizes the chemical energy released by energetic materials (EMs) triggered by underwater wire discharge to plastically shape metals. ETEF is not fully understood, particularly in research on the discharge characteristics of energetic materials triggered by metal wires and the deformation process of metal sheets. The above two problems were investigated in this paper using experimentation and numerical simulation. For the pulse discharge characteristics, the peak values of voltage and current were reduced during the triggering process of energetic materials, and the triggering energy consumption of energetic materials was quantified to be about 200 J. The matching parameters of different capacitor-voltage devices may be insensitive to triggering the energy release of energetic materials. The maximum major strain and thinning rate of the bulged specimen under ETEF conditions were significantly reduced when compared to the quasi-static specimen with the same bulging height, and the specimen’s deformation uniformity and strain distribution were improved. The simulation results showed that the addition of energetic materials significantly improved the plastic strain energy of the blank. The deformation of the blank in ETEF can be divided into two stages: the initial chemical energy action stage and the inertia action stage. The bulging height of sheet metal increased by nearly 301% in inertia action stage, accounting for 80% of the total deformation time, and the effective plastic strain distribution was more uniform. 

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Marco Minella

Papers

Enhanced formability and hardness of AA2195-T6 during electromagnetic forming

Enhanced formability and hardness of AA2195-T6 during electromagnetic forming

Improving the quality of Al-Fe tube joints manufactured via magnetic pulse welding using an inclined-wall field shaper

Improving the quality of Al-Fe tube joints manufactured via magnetic pulse welding using an inclined-wall field shaper

Investigation on deformation of DP600 steel sheets in electric-pulse triggered energetic materials forming