The objective of the study was to determine the feasibility of plastic forming by hot rolling of the AA2519 aluminium alloy sheets and cladding these sheets with a layer of the EN AW-1050A alloy. Numerous hot-rolling tests were carried out on the slab ingots to define the parameters of the AA2519 alloy rolling process. It has been established that rolling of the AA2519 alloy should be carried out in the temperature range of 400-440°C. Depending on the required final thickness of the sheet metal, appropriate thickness of the EN AW-1050A alloy sheet, used as a cladding layer, was selected. As a next step, structure and mechanical properties of the resulting AA2519 alloy sheets clad with EN AW-1050A alloy was examined. The thickness of the coating layer was established at 0,3÷0,5mm. studies covered alloy grain size and the core alloy-cladding material bond strength.
The object of this study was to develop parameters of plastic deformation process of magnesium alloy -ZK60A. The tests have showed that for this alloy it is possible to use the temperature of the plastic deformation process ranging from 350• C to 450• C. Samples were characterized by mechanical properties and structure in different heat treatment tempers. This magnesium alloy obtained in the T5 temper higher mechanical properties then T6 temper. The paper also presents research results of investigation of conversion coating on ZK60A magnesium alloy by anodic oxidation method in non-chromium solutions. It was found that the coating produced in non-chromium solutions show considerable increase of corrosion resistance of tested alloy.Keywords: magnesium alloys, extrusion, mechanical properties, structure, corrosion Przedmiotem prezentowanej pracy było określenie możliwości kształtowania plastycznego na gorąco półwyrobów ze stopu magnezu ZK60A. Z przeprowadzonych prób wynika iż dla tego stopu można stosować temperaturę przeróbki plastycznej materiału z zakresu 350• C÷450• C. Otrzymane półwyroby scharakteryzowano pod kątem właściwości mechaniczne i struktury w różnych stanach umocnienia wydzieleniowego. Stop ten uzyskuje wyższe właściwości mechaniczne w stanie T5 niż dla stanu T6. W pracy przedstawiono wyniki badań dotyczące wytwarzania powłok konwersyjnych na stopie magnezu ZK60A metodą utleniania anodowego w roztworach bezchromianowych. Stwierdzono, że wytworzone powłoki w roztworach bezchromianowych powodują wzrost odporności na korozję badanego stopu.
The object of this study was to develop parameter of the die forging process, such as feedstock temperature and to investigate her impact on the structure and mechanical properties of magnesium alloys in different heat treatment conditions. Tests were carried out on a 2,5MN maximum capacity vertical hydraulic press using forgings of sample (model) shapes. Then, based on the results obtained in previous work, research was carried out to develop for items forged from magnesium alloys the parameters of heat treatment to the T5 and T6 condition in the context of achieving possibly homogeneous and fine-grained structure and, consequently, high mechanical properties.Keywords: magnesium alloys, die forging, mechanical properties, structurePrzedmiotem prezentowanej pracy było opracowanie parametru procesu kucia matrycowego takiego jak temperatura wsadu i jej wpływu na strukturę oraz właściwości mechaniczne stopów magnezu w różnych stanach obróbki cieplnej. Badania kucia matrycowego prowadzone były na hydraulicznej prasie pionowej o sile max. 2,5MN dla przykładowych (modelowych) kształtów odkuwek. Następnie korzystając z wyników uzyskanych w poprzednich pracach, prowadzono badania nad opracowaniem parametrów obróbki cieplnej wyrobów kutych ze stopów Mg w stanach T5 oraz T6 w kontekście uzyskania możliwie jednorodnej i drobnoziarnistej struktury a w konsekwencji czego wysokich właściwości mechanicznych.
The object of this study was to develop parameters of plastic deformation in hot direct extrusion and die forging process of magnesium alloy MgAlZn. Extrusion process was conducted in the temperature range 350°C÷450°C at different extrusion speeds (ram speed 0.5 mm/s÷3 mm/s). The extrusion tests have showed that for this alloy it is possible to use the temperature of the extruded material ranging from 350°C÷450°C when the process is run at the optimum ram speed. Higher temperature of extrusion is beneficial For higher ram speed of 3mm/s, in this alloy at a temperature of 420÷450°C, cracks began to show in the surface. The same problem were for die forging. Extruded rods and forging parts were characterized by mechanical properties and structure in different heat treatment tempers. This magnesium alloy obtained in the T5 temper higher mechanical properties then T6 temper. The paper also presents research results of investigation of conversion coating on MgAlZn magnesium alloy by anodic oxidation method in non-chromium solutions. It was found that the coating produced in non-chromium solutions show considerable increase of corrosion resistance of tested alloy.Keywords: Mg alloys, extrusion, mechanical properties, structure, corrosion resistance.
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