چكيده به لاتين
the object of this research is to investigate the effect of multi-directional forging process on the microstructure, mechanical properties and ductility of wrought aluminum alloys of the 7XXX series. In the first part of this research, cube-shaped samples with dimensions of "16 x 16 x 21 mm" and suitable for a multi-directional forging mold were prepared from the raw material, which was an extruded bar of 7XXX series aluminum alloy, using wire cutting. became. Also, a mold made of hot working steel was designed to perform multi-directional forging process. Next, in order to determine the chemical composition of the alloy and identify the phases that make up the microstructure, quantum analysis and X-ray diffraction were performed, and then the microstructure of the primary alloy was examined after performing the metallographic process using an optical microscope and a scanning electron microscope. Also, in order to check the mechanical properties of the primary alloy, uniaxial tensile test and hardness test were performed, and then, in order to prepare the samples for the multi-directional forging process, solution treatment was performed at 450°C for 4 hours. And in order to ensure the positive impact of the solubilization process, the hardness and microstructure properties of the samples were re-checked, and the results were consistent with the expected results, and it was observed that the average hardness number of the initial samples went from "95 Hv" to "80 Hv" decreased and the average grain size increased from "27 μm" to "40 μm". As a result, the samples were prepared for the multidirectional forging process. In the second part of this research, the multidirectional forging process was performed in 1, 2 and 3 passes at a temperature of 450 ℃ on the samples that were subjected to solution processing, and in the third part, the method and the effect of the multidirectional forging process were investigated. on the mechanical properties and ductility of the alloy with microstructural studies with the help of optical microscope and scanning electron microscope and performing pressure test on cylindrical pressure samples with dimensions of "9 x 6 mm" prepared from cube samples that were first subjected to solution treatment and Then the multi-directional forging operations were placed, it was discussed and it was observed that, as expected before conducting the experiment by studying the similar research done in this field, the multi-directional forging process has a favorable effect on improving the mechanical properties and shape. aluminum alloy had flexibility, so that after 3 passes of deformation, the average hardness number of the samples increased to "99 Hv" and the average grain size decreased to "23 μm" and the maximum compressive strength of the samples to "1470 MPa" Increased.