Lüders effect in Al 99.7% extruded via the KoBo method
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Adelajda Weronika Brzostowicz
Abstract
The aim was to determine the effect of extrusion process parameters of the KoBo method (initial billet temperature, extrusion rate and die oscillation frequency) on the Lüders phenomenon occurrence in aluminum wires.
The material used in the experiment was 99.7% pure Al billet. The extrusion was carried out with the following parameters: extrusion ratio λ = 100, initial billet temperature in the range of 293–493 K, extrusion rate of 0.1–0.5 mm · s−1 and frequencies of 3, 5 and 8 Hz (the die oscillation angle was a constant ± 8°). Output materials were mechanically tested and examined microscopically. Based on the results it was found that: the Lüders phenomenon in aluminum wires extruded by the KoBo method appears only i) in a specific range of the extrusion force, namely 450–650 kN, ii) a specific range of, yielding strength (100–140 MPa), iii) dependent on the combination of process parameters its extent and position can vary over a product's length, iv) tests have also shown that this phenomenon has a continuous propagation nature only at the initial stage of the tensile test.
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Articles in the same Issue
- Contents
- Contents
- Original Contributions
- Diffusivities and atomic mobilities of an Sn–Ag–Bi–Cu–Pb melt
- Experimental study of the phase relations in the Fe–Cr–Si ternary system at 700°C
- Effect of molybdenum on the microstructure, mechanical properties and corrosion behavior of Ti alloys
- Mechanism of grain refinement and coarsening in undercooled Ni–Fe alloy
- Effects of copper content and liquid separation on the microstructure formation of Co–Cu immiscible alloys
- Influence of the solidification temperature range on Gasar structures made from Cu–Mn alloys
- Effect of ageing time on mechanical properties and tribological behaviour of aluminium hybrid composite
- Microstructure and tensile properties of a friction stir welded Al–Mg–Si alloy
- Lüders effect in Al 99.7% extruded via the KoBo method
- Reduced graphene oxide nanocomposites with different diameters and crystallinity of TiO2 nanoparticles – synthesis, characterization and photocatalytic activity
- Constitutive modelling of mill loads during hot rolling of AISI 321 austenitic stainless steel
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