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    Wyświetlanie 1-6 z 6
    Tytuł:
    AccumEx - A New SPD Technique for Fabricating Lamellar Materials
    Autorzy:
    Muralidharan, G.
    Verlinden, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402068.pdf
    Data publikacji:
    2015-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Bx
    81.20.Hy
    81.40.Ef
    83.50.Uv
    Opis:
    Accumulated extrusion is a novel plane strain compression technique, akin to the process of accumulated roll bonding, designed to produce ultrafine grained lamellar materials. AA1050 CP-Al processed by AccumEx displayed a grain refinement from 17 μm to 1.8 μm after 2 passes (equivalent strain of 3.2) with an increase in tensile strength of ≈70%. A comparative study with the conventional equal channel angular extrusion technique demonstrated that the former displayed a higher fraction of high angle grain boundaries with very similar trend of grain refinement. Up to now, extrusions up to 8 passes have been performed.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 4; 523-526
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prediction of mechanical properties of cold rolled steel using genetic expression programming
    Autorzy:
    Kanca, E.
    Çavdar, F.
    Erşen, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1068113.pdf
    Data publikacji:
    2016-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.20.Hy
    81.05.U
    07.05.Mh
    81.40.Ef
    89.20.Bb
    Opis:
    A new model was developed to predict the mechanical properties of St22 grade cold rolled deep drawing steel by gene expression programming. To obtain a dataset to find out the effect of reduction rate on the mechanical properties of cold rolled and galvanized steel sheet, an experimental program was constructed in the real production plant by keeping all other process parameters constant. The training and testing data sets of gene expression programming model were obtained from the test results. For gene expression programming model, mechanical properties (yield strength, ultimate tensile strength and elongation) before cold rolling, chemical composition, initial sheet thickness and reduction rate were used as independent input variables, while mechanical properties after cold rolling (yield strength, ultimate tensile strength and elongation) were used as dependent output variables. Before constructing the gene expression programming models for dependent variables, dataset was analyzed using the analysis of variance and statistically significant (P ≤ 0.1) independent parameters, i.e. initial sheet thickness, reduction rate, initial yield strength, initial tensile strength, elongation and Mn content were used in gene expression programming model. Different models were obtained for each dependent variable depending on the significant independent variables using the training dataset and accuracy of the best models was verified with testing data set. The predicted values were compared with experimental results and it was found that models are in good agreement with the experimentally obtained results.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 1; 365-369
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dislocation Substructure Evolution during Hydrostatic Extrusion of Al-Mg-Si Alloy
    Autorzy:
    Chrominski, W.
    Lewandowska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402087.pdf
    Data publikacji:
    2015-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Bx
    61.72.Ff
    81.20.Hy
    81.40.Ef
    81.40.Lm
    Opis:
    Hydrostatic extrusion is a technique which allows to produce rods with ultrafine grains and unexpectedly enhanced mechanical properties caused by grain refinement. However, the mechanism of such a refinement is not fully understood at this stage. 6xxx aluminium alloys series are usually processed by extrusion. In this study, commercial 6082 aluminium alloy was extruded at ambient temperature in a cooled die in two stages to the true strain of ε =3.2. Such a processing results in a not fully refined microstructure which allows to study different stages of grain refinement. The texture, dislocation substructures and grain refinement were investigated using electron backscatter diffraction and transmission electron microscopy techniques. The results revealed that two main texture components are present in the extruded rods - ⟨111⟩ fiber texture and ⟨001⟩ recrystallized grains. Transmission electron microscopy inspection revealed dislocation structures that can be associated with different stages of plastic deformation according to the low energy dislocation structures hypothesis proposed by Kuhlmann-Wilsdorf.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 4; 585-588
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acoustic Emission Study of the Deformation Behavior of Mg-Mn Alloys Containing Rare Earth Elements
    Autorzy:
    Illkova, K.
    Dobroň, P.
    Chmelík, F.
    Letzig, D.
    Bohlen, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419114.pdf
    Data publikacji:
    2012-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Bx
    81.20.Hy
    83.50.Uv
    81.40.Ef
    83.50.-v
    43.40.Le
    Opis:
    Magnesium-manganese (Mg-Mn) based alloys with various chemical composition were processed by indirect extrusion at two different speeds. Alloying with Mn and rare earth elements has significant influence on the microstructure and on the texture of the alloys under investigation. This paper deals with the acoustic emission analysis of the deformation behavior of the extruded Mg-Mn alloys. The acoustic emission measurements were performed during the uniaxial tension and compression tests, and the obtained results are discussed with respect to the influence of rare-earth elements on the deformation behavior, particularly in terms of the activation of dislocation glide and twinning.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 3; 634-638
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical Properties of Aluminum-Matrix-Nanoparticle Composites
    Autorzy:
    Kazakewitsch, A.
    Riehemann, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1418512.pdf
    Data publikacji:
    2012-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.82.Rx
    62.40.+i
    81.05.-t
    81.05.Ni
    81.07.Wx
    81.20.Ev
    81.20.Hy
    81.40.Ef
    81.70.-q
    81.70.Bt
    Opis:
    Aluminum-matrix-nanoparticle composites were produced by ball milling of micro scale aluminum powder with different additions of 500 nm mean diameter SiC particles in air atmosphere with subsequent consolidation by hot extrusion. The material was investigated in this condition by tensile testing, hot tensile testing, density, hardness, and amplitude dependent damping measurements. The amplitude dependent damping of the material was investigated after slow furnace heating and cooling as after quenching into water to the room temperature. The results of the tensile and hot tensile testing show that the addition of SiC particles lead to a significant increase of tensile strength, but the remaining porosity increased, too. The results obtained for the amplitude dependent damping can be attributed to cracks present in the consolidated material or cracks produced by thermal stresses.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 3; 516-519
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Processing of Integral-Skin Cellular Polymeric Composites in Rapid Rotational Foam Molding
    Autorzy:
    Pop-Iliev, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1503503.pdf
    Data publikacji:
    2011-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    47.32.Ef
    81.20.Hy
    82.70.Rr
    47.57.Bc
    83.80.Iz
    83.80.Sg
    61.25.hk
    47.85.md
    81.05.Qk
    83.80.-k
    Opis:
    In order to survive the competition, the processing cycle time and the energy consumption of the rotational foam molding process must be reduced to a fraction of its current levels without compromising product quality. This paper introduces a novel extrusion-assisted rotational foam molding process for the manufacture of rotational moldings having adjacent, but clearly distinct, layers of an integrated solid (non-cellular) skin boundary layer encapsulating a cellular core structure, consisting of identical or compatible polyolefin grades, that achieves significant savings in processing cycle time duration and energy consumption. It introduces non-chilled extruded foam as a foamed core-forming material, in real time, directly into a uni-axially rotating hot mold through a dedicated mold "injection" port onto the already formed un-foamed soft skin layer.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 2; 292-297
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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