The b-Al5FeSi intermetallic phase and coarse Mg2Si particles have negative effects on extrudability and workability of 6xxx Al alloys billets. To achieve extruded products with a high surface quality, the as-cast billets are heat-treated before extrusion. During heat treatment, the undesired intermetallic particles, i.e., b-AlFeSi platelets are transformed to rounded a-Al(FeMn)Si intermetallic ...

Utilising the oxyfuel practice for CH4-fuelled combustion has positive effects on emissions, efficiency and cost of high temperature furnace practices. However, especially in older installations, usage requires retrofitting alters atmosphere which oxidation steel occurs, when compared to using air as oxidiser. Stainless slab oxide growth during reheating was studied different atmospheres. The s...

Formation of the high-temperature ?-Al2O3 phase during Plasma Electrolytic Oxidation aluminium at ambient bulk temperatures has been previously attributed to local microdischarge events providing multiple melting-solidification cycles in micro-volumes surface oxide layer. In this work, it is demonstrated that ? can be formed even if fully suppressed under specific processing conditions. Oxide l...

Plasma nitriding is widely used in various industrial applications to improve surface hardness and wear properties. Especially for tool steels, it also the support adhesion of diamond-like carbon (DLC) coatings. The properties nitrided zone produced by plasma are influenced applied process parameter, particular temperature time. However, high-alloy a deeper understanding underlying diffusion pr...

   Diffusion of nitrogen in plasma nitrided iron and structural evolution during the nitriding process were evaluated by several characterization techniques including optical microscopy (OM), microhardness depth profiling (HDP), scanning electron microscopy (SEM), x-ray diffraction (XRD), glow discharge optical emission spectroscopy (GDOES), and secondary ion mass spectroscopy (SIMS). Plasma ni...

In the aluminum die casting process, erosion, corrosion, soldering, and die sticking have a significant influence on tool life and product quality. A number of coatings such as TiN, CrN, and (Cr,Al)N deposited by physical vapor deposition (PVD) have been employed to act as protective coatings due to their high hardness and chemical stability. In this study, the wear performance of two nanocompo...

The inhibitory and antimicrobial effects of silver particles have been known since ancient times. In the last few years, a major health problem has arisen due to pathogenic bacteria resistance to antimicrobial agents. The antibacterial activities of new materials including hydroxyapatite (HAp), silver-doped hydroxyapatite (Ag:HAp) and various types of antibiotics such as tetracycline (T-HAp and...

18% Ni-Co-Mo-Ti ferrous base alloys are special materials, widely used in the industry of isotopic enrichment after specific annealing and aging thermal treatment. The desirable high mechanical properties can then be attained by adequate heat treatment, answering structural materials specifications required defense applications aerospace nuclear engineering. For instance, enrichment, rocket eng...