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The experimental studies of the properties of the hardened surface layer, developed by the microarc oxidation method (MAO) on the surface of Al-Si ingots from AK12D alloy have been presented here. The effect of concentration of the electrolyte components on the properties of the MAO coating, such as microhardness, thickness, porosity have been studied. The corresponding regression equations to estimate the influence of the process parameters on the quality of the developed MAO-layer, have been set up. [ABSTRACT FROM AUTHOR]

The microstructure and mechanical properties of joint welds formed by linear friction welding (LFW) in in Al-Cu-Mg alloy was investigated. Joint welds of two samples of rectangular shape do not possess any macroscopic defects and are characterized by high strength. The substantial transformation of the microstructure occurs in the weld zone as a result of plastic deformation and deformation heating during LFW. [ABSTRACT FROM AUTHOR]

The investigation studies the properties of hardened surface layers, developed with the microarc oxidation method (MAO) on ingots of a Al-Si alloy. It has been proved that properties of the developed surfaces (microhardness, thickness, porosity and corrosion properties) depend on the concentration of electrolyte components. [ABSTRACT FROM AUTHOR]

The paper presents the results of studies of the properties of hardened surface layers formed by micro-arc oxidation on the workpiece surfaces of aluminum alloy Al-12Si-Mg-Cu-Ni. The authors attempted to determine the influence of micro-arc oxidation modes on the properties of the modified layers. Investigation of the adhesion strength of the surface layers formed at different concentrations of electrolyte components and analysis of the change in coatings adhesion characteristics after thermal cycling were presented. [ABSTRACT FROM AUTHOR]

The paper presents the results of the application of a newly developed method to study deformation and fracture processes in specimens produced by linear friction welding. This method combines mathematical modeling and experimental mechanical testing. By application of this method it has been demonstrated that during uniaxial testing of welded joint specimens of Ti-6Al-4V and Ti-6Al-3.5Mo shear bands occur at an angle of 45°. Fracture of the specimen took place near the weld line, in the heat-affected zone, of the Ti-6Al-4V alloy. Microcracks started in the centre of the tested specimen. Recording of acoustic emission signals during tensile testing identifies the appearance of the initial microcracks and can predict the precise moment of fracture. [ABSTRACT FROM AUTHOR]