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Purpose: In the technical 6xxx Al alloys besides the intentional additions Mg i Si, transition metals and impurities (Fe and Mn) are always present. Even not large amount of these impurities causes the formation a new phase components. The exact composition of the alloy and casting condition will directly influence the selection and volume fraction of intermetallic phases. During casting of 6xxx alloys,...
Purpose: The main task of this work was to study the fracture mechanism in 6082 aluminium alloy. Design/methodology/approach: Microstructure and fractografic examination has been carried out on the samples in the peak aged condition after static tensile tests, crack resistance test and tensile test in the presence of sharp notch using an optical microscope - Nikon 300, scanning electron microscope...
Purpose: The purpose of this paper is to present the results of studies of AlSi5Cu2Mg cast alloy in T6 condition at an angle of intermetallic phases composition. It was found that the investigated alloy microstructure consists of three different, as regards shape intermatallic phases. Design/methodology/approach: In this study, several methods were used, such as: optical light microscopy (LM) scanning...
Purpose: Investigation of low alloy Cr–Mo–V cast steel after long – term operation and regenerative heat treatment. Design/methodology/approach: Micro structural investigations were carried out using transmission electron microscopy. Findings: The microstructure and carbide types after long – term operation and after regenerative heat treatment (including bainitic hardening with high tempering temperature)...
Purpose: The aim of the research is the investigation of the structure, texture and chemical composition of coatings deposited by PVD technique (reactive dc magnetron sputtering method) onto the substrate from the CuZn40Pb2 brass. Design/methodology/approach: Microstructure was characterised using optical metallography, scanning and transmission electron microscopy. Changes of the chemical composition...
Purpose: In the technical Al alloys even small quantity of impurities - Fe and Mn - causes the formation of new phase components. Intermetallic particles form either on solidification or whilst the alloy is at a relatively high temperature in the solid state, e.g. during homogenization, solution treatment or recrystallization. The exact composition of the alloy and casting condition will directly...
Purpose: The purpose of this work was to determinate the influence of the 20% Sr substitutions (in sublattice A) on changes of the character of phase transition (PT) in comparison with pure barium titanate BaTiO3 (BT). Design/methodology/approach: Polycrystalline samples of (Ba0.80Sr0.20)TiO3 (BS20T) were prepared by calcinations method at temperature 1620 K. X-ray measurements were executed from...
Purpose: A growing trend to use the new copper-based functional materials is observed recently world-wide. Ultrafine grained copper, solid solution hardened and age-hardened copper alloys are applied where combination of high electrical conductivity with high strength is required. Design/methodology/approach: This study was aimed to investigate microstructure in strips of copper alloys with different...
Purpose: The aim of the work is to investigate the microstructure heat treated and cold rolled commercial copper alloy CuTi4. Design/methodology/approach: The Investigations of the structure were made on ZEISS SUPRA 25 with EBSD method. Observations of the structure on thin foils were made on the JOEL 3010 transmission electron microscope (TEM). Findings: Decomposition of supersaturated solid solution...
Purpose: The goal of the work is analysis of the knowledge extent on the bactericidal activity of copper and its alloys. Design/methodology/approach: Analysis of publications on the antibacterial properties of copper in the engineering and medical journals, taking also into account publications on the earliest documented employment of copper as the bactericide or medicine. Findings: Analysis of the...
Purpose: Carbon nanostructured materials are important and still not satisfactorily recognised products. Structure can be investigated with sufficient resolution using transmission electron microscopy but main difficulties are connected with low scattering of electrons by carbon atoms and destruction by knock-on damage caused by collisions of high energy electrons with specimen atoms. Design/methodology/approach:...
Purpose: The aim of the research was to identify possibility of extending the life time of zirconium claddings. Materials used in nuclear reactors work in extremely hard conditions: irradiation, corrosion, stress. Zirconium alloys, due to their good water corrosion and radiation resistance at normal working conditions of nuclear reactors are used as cladding material for fuel elements. In the case...
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