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1
Content available Electroless Nickel Plating on AM60B Magnesium Alloy via Ti-Zr/Sol-Gel Composite Layer as Pretreatment
Nazari Zhale, Seifzadeh Davod, Rajabalizadeh Zahra
Archives of Metallurgy and Materials
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2022
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Vol. 67, iss. 3
913--920
EN
The Ti-Zr and Ti-Zr/sol-gel were used as pretreatment layers before the electroless nickel coating on AM60B magnesium alloy. Scanning Electron Microscopy was employed to investigate the surface morphology of the pretreated layers and applied electroless coatings. Chemical analysis of the Ti-Zr layer, and nickel coatings was done using the Energy-Dispersive X-ray Spectroscopy. Moreover, the X-ray Diffraction and Atomic Force Microscopy methods were utilized to evaluate the microstructure and surface roughness of the electroless coatings, respectively. Electrochemical Impedance Spectroscopy was employed to study the corrosion behavior of Ni-P coatings. The results show that Ti-Zr layer has structural cracks, and the sol-gel film was covered all cracks entirely. The cauliflower-like electroless nickel coating was applied on both mentioned pretreated layers. The cross-sectional images revealed the higher thickness for the electroless coating on Ti-Zr/sol-gel layer, probably due to a large number of Ni nucleation centers. The EIS results demonstrate that the electroless coating on Ti-Zr/sol-gel has high corrosion protection and microhardness value.
2
Content available Groove Rolling Process of Mg/Al Bimetallic Bars
Mróz S., Stefanik A., Szota P.
Archives of Metallurgy and Materials
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2019
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Vol. 64, iss. 3
1067--1072
EN
The paper presents the results of the experimental tests of Mg/Al bimetallic bars rolling process in classic and multi-radial modified round-oval-round passes. The bimetallic bar consist of magnesium core, grade AZ31 and aluminium outer layer, grade 1050A. The stocks were round bars with diameter 22.5 mm with an aluminium layer share of 28%. As a result of rolling in four passes, bars of a diameter of about 17 mm were obtained. A bimetallic feedstock was manufactured using an explosive welding method. The use of the designed arrangement of multi-radial modified stretching passes resulted in obtaining Mg/Al bimetallic bars with an uniform distribution of the cladding layer over the bar perimeter and high quality of shear strength between individual layers compared to Mg/Al bars obtained in the classic passes.
3
Content available Influence of the Arrangement of Materials and Microstructural Analysis During FSW of AZ80A & AZ91C Mg Alloys
Sevvel P., Jaiganesh V.
Archives of Metallurgy and Materials
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2017
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Vol. 62, iss. 3
1795--1801
EN
The main objective of this paper is to produce defect free weldments with improved properties during friction stir welding of dissimilar Mg alloys. The influence of the anisotropic arrangement of materials when AZ80A Mg alloy is taken as advancing side and AZ91C Mg alloy as retreating side and vice versa with respect to their mechanical properties and microstructural characteristics were investigated. The effects of various FSW parameters on the quality of these joints were also analyzed and best optimized FSW parameters were suggested. Defect free sound joints with excellent mechanical properties were produced when AZ80A Mg alloy was positioned at retreating side. At the same time, it seems a little bit difficult to obtain good quality joints with the contrary arrangement of materials. These investigations revealed that materials having inferior plastic deformability must be kept at the advancing side to obtain sound joints during FSW of dissimilar alloys of Magnesium.
4
Content available remote Nowoczesne, zaawansowane technologie wytwarzania wyrobów ze stopów magnezu metodami przeróbki plastycznej
Płonka B., Korczak P., Remsak K., Remsak M.
Szybkobieżne Pojazdy Gąsienicowe
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2016
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nr 4 (42)
41--49
PL
W artykule opisano badania i uzyskane wyniki procesu współbieżnego i przeciwbieżnego wyciskania prętów, kształtowników, rur itp., które były prowadzone dla stopów magnezu MgAlZn. Jest to grupa stopów podlegająca obróbce cieplnej, dla której można osiągnąć jedne z najwyższych wartości wytrzymałości. Materiały te zostały wytworzone w IMN OML Skawina w postaci wlewków o średnicy 100 mm. Proces wyciskania prowadzono w zakresie temperatur od 320 st.C do 430 st.C i prędkości wyciskania od 0,5 do 5 mm/s. Badano również wpływ obróbki cieplnej na właściwości mechaniczne stopów magnezu. Dla badanych stopów magnezu uzyskano wyższe właściwości mechaniczne dla stanu T5 niż dla stanu T6. We wnioskach odniesiono się do możliwości wykorzystania uzyskanych wyników.
EN
This paper discusses the process of direct and indirect extrusion of rods, profiles, tubes etc. for a series of MgAlZn magnesium alloys, which are suitable for heat treatment to obtain the highest strength. These products have been manufactured in Institute of Non-Ferrous Metals, Light Metals Division (IMN OML) in the form of billets with a 100 mm diameter. The extrusion process was performed in the temperature range between 320 st. C and 430 st.C and at the ram speed of 0.5 to 5.0 mm/s. The impact of heat treatment on the mechanical properties of magnesium alloys were also the subject of this study. The tested magnesium alloys had higher mechanical properties for temper T5 than for temper T6. In conclusion, reference is made to the possibilities of practical application of the obtained.
5
Content available remote Research into the technological process of extrusion - type forging of automotive wheel made of magnesium alloy produced with the help of loaded - die
Petrov P., Voronkov V., Plotnikov A., Ivanov V., Petrov M., Basyuk S.
Computer Methods in Materials Science
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2011
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Vol. 11, No. 2
251-258
EN
The presented paper deals with the manufacturing of the automotive wheels. It focuses on the effect of the forging die geometry on the loading conditions during the hot forging of the preform of the wheel. The investigation within the scope the paper has been done on the basis of the finite-element (FE) modelling. It was carried out by means of the FE commercial codes QFORM-2D/3D. The FE modelling of the hot forging of the preform of the wheel showed the potentiality of the chosen scheme of the combined extrusion-type forging with the help of a loaded-die. The relationships between the geometrical parameters of the die and the technological parameters of the forging were established on the basis of numerical simulation.
PL
Artykuł dotyczy wytwarzania felg samochodowych. Badany jest wpływ kształtu matrycy na siły w procesie kucia na gorąco. Do badań wykorzystano komercyjny program MES QFORM-2D/3D. Symulacje kucia felgi samochodowej pokazały potencjalne możliwości kombinowanego procesu wyciskania-kucia we wstępnie obciążonych matrycach. Wyznaczone zostały zależności pomiędzy kształtem matrycy i parametrami technologicznymi kucia.
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