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Publications (24)
Equal Channel Angular Rolling (ECAR), a severe plastic deformation process, is suitable for the shear deforming a long and thin sheet continuously. An interesting issue is that thickness of a sheet is not reduced during ECAR. Although the shear texture and fine grain structure are easily obtained by ECAR, yet the ECAR process's difficulties in term...
The paper presents numerical simulation-FEM variations in the technological and design parameters of deformation at different levels during the plastic deformation of complexly shaped hollow parts of a pure molybdenum sheet in terms of the thermo forming. Variations of the process parameters such as deformation temperature, blank holder force, shap...
The paper presents numerical simulation-FEM variations in the technological and design parameters of deformation at different levels during the plastic deformation of complexly shaped hollow parts of a pure molybdenum sheet in terms of the thermo forming. Variations of the process parameters such as deformation temperature, blank holder force, shap...
Microstructure evolution and tensile properties of large dimensional bulk 304 stainless steel after being rolled with different thickness reductions were characterized in detail. The results showed that the steel consisted of nano-submicro-microcrystalline austenite and nanocrystalline ferrite. Submicrocrystalline austenite was broken down with the...
This paper is about the conception, design and realization of a new unique ECAP system with application of back-pressure and intensive ultrasound energy. 3D finite element calculations were used for finding the best construction configurations. The new unique ECAP equipment is used for deforming metallic samples with dimensions of 12 x 12 x 100 mm...
Magnesium alloy EZ10 (Mg-RE-Zn) was deformed in tension at temperatures from 20 up to 520 degrees C. A rapid decrease of the yield and tensile strength with temperature was observed at temperatures higher than 300 degrees C. On the other hand, ductility of samples rapidly increased in the same temperature range. Light microscopy and scanning electr...
One of the ways to the more effective use of metallic materials is their processing by forming. At present in this the area the use of the process of severe plastic deformation (SPD process), leading to a refinement of the structure (materials with UFG structure) and thus to achievement of higher level of their utility value, is expanding. AlMn1Cu...
For the purpose of creating nanostructures in the metallic materials was designed a special experimental system. This system has a very simple way to ensure repeat deformation group procedure that functional part of the system is able to rotate. Blanks for the experimental work was 99.9 % aluminium powder, which was compressed pressure of 600 MPa,...
Magnesium alloy EZ10 was deformed in tension at temperatures from room temperature up to 400 °C with an initial strain rate of 2.7x10-3 s-1. Deformation tests showed a rapid decrease of the tensile yield strength at temperatures higher than 300 °C. Microstructure of the deformed samples was analysed with light microscope. Fracture mechanisms were e...
One of the ways to the more effective use of metallic materials consists in their processing by forming. At present in this the area the process of severe plastic deformation (SPD process) is used, leading to a refinement of the structure (materials with UFG structure). The main goal of the paper is a review of the current achieved results obtained...
Increase of mechanical properties in sheets, obtained by severe plastic deformation is very important for final manufacture of machine parts produced from such blanks. At the VSB - Technical University of Ostrava, Faculty of Mechanical Engineering special equipment DRECE (Dual Rolls Equal Channel Extrusion) was developed, which uses the principle o...
One of the ways to the more effective use of metallic materials consists in their processing by forming. At present in this the area the process of severe plastic deformation (SPD process) is used, leading to a refinement of the structure (materials with UFG structure). The main goal of the paper is a review of the current achieved results obtained...
The paper is focused on the wear mechanism of orbital forged and equal-channel angular extruded Cu OFHC (oxygen-free high thermal conductivity) material. The wear behaviour of the Cu OFHC material is investigated through pin-on-disc tests. Two different processing conditions have been used, equal-channel angular processing (ECAP) and orbital (radia...
The paper is concentrated on mathematical simulation of the extrusion process by the classical and modified ECAP tool in 3D area and compares these results with our own experiments. The research was focused on the resulting magnitude of strengthening in classical geometry of ECAP channels
in comparison with modified geometry of the ECAP tool (helic...
In the present paper OFHC (oxygen free high conductivity) copper was tested by static and dynamic tensile tests at room temperature owing to strain rate investigation. Because of coarse-grained (CG) and ultrafine-grained (UFG) microstructure observation the copper was subjected to drawing and ECAP processes. The investigation of strain rate and mic...
The main aim of this paper is to show how back pressure equal channel angular pressing (ECAP-BP) influences the porosity distribution in powder metallurgy (PM) aluminium alloys. When back pressure is applied, the accumulation of damage in deformed samples decreases due to the fact that the shear strain takes place under predominantly compressive st...
Purpose: of this paper is realisation of engineering design and manufacture of new type of equipment DRECE (Dual Rolling Equal Channel Extrusion), designated for obtaining UFG structure in strip of sheet.Design/methodology/approach: The equipment enables refinement of grain in strip of sheet by extrusion technology without change of cross-section....
At present technologies of production of ultra-fine grained (UFG) metallic materials and subsequently of semis are being used in broader extent both in pilot plants and in industrial practice. Amount of investments necessary for realisation of industrial equipment and afterwards for industrial production is from this viewpoint a critical factor. Re...
The aim of this work was to perform an analysis of severe plastic deformation on the porosity characteristics of aluminium PM alloy. The studied Al-Zn-Mg-Cu aluminium alloy was pressed in two different pressures 400 and 600 MPa; than three different processing conditions (debinding at 400 °C for 60 min, sintering in a vacuum furnace at 610 °C for 3...
Achievement of ultra-fine grained (UFG) structure in the strip of sheet is one of the basic problems of the current research in the field of forming. Contrary to bulk forming (processes ECAP, HPT, Conform, etc.), it is much more difficult to achieve high degree of deformation during 5 to 7-8 passes by the processes ARB, C2S2 (DCAP). At extrusion of...
In the present paper behavior of ultrafine-grained (UFG) oxygen free high purity (OFHP) copper prepared by severe plastic deformation (SPD) methods was investigated during dynamic loading. The initial Cu after zonal purification was subjected by 5 passes of equalchannel angular pressing (ECAP) via C route at room temperature. The 5 ECAP passes are...
Equal channel angular pressing (ECAP) is a material processing method for developing an ultrafine-grained (UFG) structure by introducing severe plastic deformation (SPD) in a bulk material with no changes in its cross-section. Numerous analytical and numerical studies on equal channel angular pressing have been performed in recent years. The presen...
