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The effect of pulsed electric current on the structural and mechanical behavior of 6016 aluminium alloy in different states of hardening

Dobras Daniel, Zimniak Zbigniew, Zwierzchowski Maciej

Archives of Civil and Mechanical Engineering

2023

Vol. 23, no. 3

art. no. e166, 2023

This study presents the effect of high current pulses on the structural and mechanical behavior of the 6016 aluminium alloy in three different states of hardening: naturally aged, super saturated, and annealed. The 6016 aluminium alloy was used for the first time in terms of electrically-assisted forming. The influence of the application of different current parameters on the material behavior was conducted. The study of electrically-assisted tensile tests showed that the application of current pulses results in a distinct response of the material, depending on the hardening state. Although in a hardened state, the mechanical properties and plasticity are deteriorated, in the solution treated state, they are improved. For the changes of the material properties is responsible the interaction of the flowing current with the precipitates and the aging process. The new parameters were proposed to describe the distinctions in the material properties between the different states of hardening of the aluminium alloy during the electrically-assisted tension. The material examination was conducted using light and scanning electron microscopy, using also electron backscattered diffraction methods. The application of, for example, the grain orientation spread parameter demonstrated the presence of recrystallized grains, in electrically-assisted specimens.

Tłoczenie blach za pomocą narzędzi wytwarzanych z tworzyw sztucznych

Zimniak Zbigniew, Kosmatka Magdalena

Stal, Metale & Nowe Technologie

2021

nr 5-6

38--41

W artykule przedstawiono proces kształtowania blach metodą głębokiego tłoczenia z wykorzystaniem nowatorskich narzędzi wykonanych z tworzyw sztucznych za pomocą druku 3D. W celu wyboru najlepszego wariantu narzędzi wykonano symulacje numeryczne przeprowadzone metodą FEM oraz badania doświadczalne. Najlepsze wyniki tłoczenia uzyskano dla narzędzi wykonanych metodą drukowania z tworzywa PLA. Tak wyprodukowane narzędzia dają obiecujące wyniki, szczególnie dla mało- i średnioseryjnej produkcji wytłoczek.

The article presents the process of forming sheets using deep stamping with novel tools made of plastic with the use of 3D printing. Numerical simulations by FEM and experimental tests were performed to select the best tool. The best stamping results were obtained for PLA tools made by printing. Such tools produce promising results, especially for shortand medium-run production of diestampings.