Twin-roll casting (TRC) is an advantageous substitution for Direct-Chill (DC) in the manufacturing of rolled aluminium products. The results a study phase transformations and their interaction with recrystallization occurring during annealing TRC Al-Mn based alloys are reported. Four different contents Mn, Si Fe were investigated. Precipitation was studied by resistometric measurements course heating at linear rate. microstructural processes responsible observed changes resistivity...

This article deals with the influence of alloy temper during heat treatment on mechanical and corrosion properties aluminium alloys 2024 (Al-Cu-Mg) 6064 (Al-Mg-Si). For experiment initial tempers 2024-T351 6064-T8 were treated to three conditions - underaged, peak aged (T6) overaged simulate circumstances manufacturing process. Structure all was observed. The hardness, yield strength, ultimate strength elongation maximum depth attack peneration rate in Audi immersion test for automotive...

Abstract Accumulative roll bonding (ARB) allows producing ultrafine-grained sheets of high strength and has been successfully used to prepare such materials from aluminium alloys. However, due intensive work hardening bond-rolled AlMg3 sheets, significant edge cracking occurred. Cracking was reduced by cladding with aluminium. Lamellar composites were thus prepared. Their structure studied electron backscatter diffraction transmission microscopy; evaluated microhardness measurements tensile...

An ultrafine-grained EN AW 6082 aluminum alloy was prepared by continuous serve plastic deformation (i.e., thermo-mechanical equal channel angular pressing (ECAP)-Conform process). A miniaturized tensile testing technique used for estimating local mechanical properties with the aim to reveal inhomogeneity of elastic and in a workpiece volume. These inhomogeneities may appear due irregular shear strain distribution Conformed wire. Miniaturized samples were cut from workpiece. Elongation...

This article deals with the influence of alloy temper during heat treatment on mechanical and corrosion properties aluminium alloys 2024 (Al-Cu-Mg) 6064 (Al-Mg-Si). For experiment initial tempers 2024-T351 6064-T8 were treated to three conditions - underaged, peak aged (T6) overaged simulate circumstances manufacturing process. Structure all was observed. The hardness, yield strength, ultimate strength elongation maximum depth attack peneration rate in Audi immersion test for automotive...

Accumulative Roll Bonding (ARB) is a technique of grain refinement by severe plastic deformation, which involves multiple repetitions surface treatment, stacking, rolling, and cutting. The rolling with 50% reduction in thickness bonds the sheets. After several cycles, ultrafine-grained (UFG) materials are produced. Since ARB enables production large amounts UFG materials, its adoption into industrial practice favoured. has been successfully used for preparation sheets from different ingot...

Aluminium Al-Mg-Si-type alloys (6xxx-series) exhibit good mechanical properties, formability, weldability and corrosion resistance in various environments. They often find use automotive industry other applications. Some alloys, however, particularly those with higher copper levels, show increased susceptibility to intergranular corrosion. Intergranular (IGC) is typically related the formation of microgalvanic cells between cathodic, more noble phases depleted (precipitate-free) zones along...

A new special structural nickel-based alloy for use in molten fluoride salt environments reactors (MSR) began to be developed by the COMTES FHT Company Czech Republic as early 2001. The outcome of this development was MoNiCr alloy, an alternative Hastelloy-N. present study carried out on two experimentally-manufactured nickel alloys: and HN80MTY. Its purpose activate recrystallization processes as-cast microstructure these alloys. In addition, experiments were performed find a temperature...

This work concerns mechanical properties in relation to microstructural changes hardenable EN AW-2024 aluminium alloy wrought and heat treated condition. The material benefits from synergistic effects of hardening mechanisms. Grain boundary strengthening were activated this by rotary swaging. Rotary swaging is a method which shows great promise for industrial use. Precipitation was achieved thanks the material’s age ability. First, artificially-aged furnace at 140–180 °C. Second, natural...

In this study, the relationship between structure and properties of commercial purity aluminium alloy A1199 was investigated by applying constrained groove pressing (CGP) deformation method. The refinement coarse grain (Al) microstructure to sub microcrystalline size large plastic strain at room temperature defined. impact various strains upon changes is using transmission electron microscopy (TEM thin foils) back scatter diffraction (EBSD). A mixture subgrains produced grains subdivision...

Accumulative Roll Bonding (ARB) is a severe plastic deformation process that allows producing ultrafine-grained materials (UFG). UFG sheets exhibit enhanced strength and very fine grain structure. Foils used as fins in heat exchangers have to be thin but must high combined with relatively formability. Thus, produced using ARB may fulfil the exacting requirements on foil properties for such applications. The thermal stability of Al-Fe- Mn-Si foils subsequent cold rolling was studied compared...

Thermal expansion is an important material property. From change of this quantity phase transformations can be evaluated. Therefore dilatometry a common tool for construction transformation diagrams in steel and prediction structure according to the performed heat treatment. However there are some restrictions quenching dilatometers, such as magnetic properties or weldability controlling measuring thermocouple. In article proposed evaluation precipitation during continuous cooling from...

Abstract Accumulative roll bonding is a method for achieving grain refinement of metallic materials by severe plastic deformation, resulting in strength superior to that conventionally manufactured sheets. The has been successfully used the authors prepare bulk ultrafine-grained sheets from pure aluminium and several twin-roll cast alloys. present paper summarizes results study aimed at monitoring evolution microstructure mechanical properties during accumulative process AlMg3 (AW – 5754)...

A car manufacturer makes crankshafts of materials from various suppliers. The steels individual batches differed in their grinding behaviour, despite being supplied as a single steel grade. Some deliveries were repeatedly associated with much faster wear wheels than others. Consequently, the ground surfaces developed visible patterns and, some cases, surface cracks. excessive was suspected to be caused by titanium precipitates. purpose this investigation identify phases which is present...

Mechanical properties and microstructure of twin-roll cast (TRC) pure aluminium, Al-Fe-Mn-Si (AA8006) Al-Mg (AA5754) alloy sheets ARB processed at ambient elevated temperatures (200, 250, 300 350°C) were investigated. Processing results in better bonding but it produces smaller increases hardness. AA8006 specimens without any problems up to 7 cycles. The AA5754 suffered from severe edge notch cracking since the first cycle. strength was evaluated tensile test microhardness measurements;...

In this study, the relationship between structure and properties of commercial purityaluminium (AW-1199) was investigated by applying constrained groove pressing (CGP) method.The refinement coarse grain aluminium microstructure to submicrocrystalline size largeplastic strain at room temperature defined. The impact various strains upon microstructurechanges is using transmission electron microscopy (TEM) back scatterdiffraction (EBSD). A mixture subgrains produced grains subdivision...

Last 15 years is in the sign of increasing pressure on decreasing content toxic metals consumer products. Widely known are legislative rules cadmium, hexavalent chromium and mercury various products for their negative effect environment human health. Similar acts take care lead free machined brass. For example that come from directive European Council 98/83/ES released November 3rd 1998 command, maximum brass which contact with drinking water has to be less than 1%. stronger applied...