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    Wyświetlanie 1-15 z 15
    Tytuł:
    Mechanical and Structural Properties of High Purity Al Processed by ECAP
    Autorzy:
    Kvačkaj, T.
    Kočiško, R.
    Pokorný, I.
    Bidulská, J.
    Kvačkaj, M.
    Kováčová, A.
    Bidulský, R.
    Lityńska-Dobrzyńska, L.
    Dutkiewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1418957.pdf
    Data publikacji:
    2012-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Bx
    81.07.-b
    81.20.Hy
    81.40.-z
    Opis:
    The mechanical properties and substructure formation of high purity aluminium (99.999%) processed by severe plastic deformation method (equal channel angular pressing) were studied. The equal channel angular pressing process was carried out at room temperature by route C (sample rotation around the axis about 180° after each pass) in a die with two channels intersecting at an angle of Φp = 90. The softening mechanism through dynamic recovery was recognized up to 6th equal channel angular pressing pass, however, after that the mechanical strengthening was revealed. The samples after equal channel angular pressing processing were annealed in different temperature and time conditions. The influence of annealing temperature and time on microhardness as well as diameter of grain size were investigated in samples processed by the 4th equal channel angular pressing pass.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 3; 557-560
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural Stability of Amorphous Alloy of Modified Finemet Type
    Autorzy:
    Huráková, M.
    Csach, K.
    Juríková, A.
    Miškuf, J.
    Rajňák, M.
    Ďurišin, M.
    Kvačkaj, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1387067.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.Dq
    62.20.Hg
    62.20.de
    Opis:
    The Finemet type amorphous alloys are well known as high frequency soft magnetic materials. They have good soft magnetic properties which are characterized by low coercive force and high permeability because of the lack of crystalline anisotropy. The structural stability of the amorphous ribbon of Finemet type modified by Mn, Al and Cr prepared by melt-spinning process was studied using differential scanning calorimetry and dynamical mechanical analysis. With increase of the crystalline portion in the sample, the Curie transition is shifted to the higher temperatures. The magnetic relaxation processes at frequencies above 10⁴ Hz were detected by mass magnetic susceptibility measurement.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 564-566
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research of fatigue and mechanical properties AlMg1SiCu aluminium alloys
    Autorzy:
    Mihaliková, M
    Lišková, A
    Vojtko, M.
    Kvačkaj, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/957961.pdf
    Data publikacji:
    2015
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    aluminum alloys
    mechanical properties
    fractography
    hardness
    equal channel angular pressing (ECAP)
    fatigue testing
    Opis:
    The paper is concerned with an analysis of utility and fatigue properties of industrially produced aluminium alloy, specifically EN AW 6061 (AlMg1SiCu), reinforced with the particles of SiC. The following properties were subject to evaluation: microstructure and sub-structure, mechanical characteristics. All of these mechanical properties in pre- and post- equal channel angular pressed (ECAP) state have been studied. The hardness was evaluated by Vickers hardness test at the load of HV10. The significant part the thesis was devoted to the fatigue properties at cyclic load in torsion. The presented results demonstrate well that the combination of fractography and microscopy can give a significant contribution to the knowledge of initiation and propagation crack in the aluminium alloy.
    Źródło:
    Advances in Science and Technology. Research Journal; 2015, 9, 28; 56-60
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of Fracture Surfaces of Soft Magnetic Materials
    Autorzy:
    Bidulská, J.
    Kvačkaj, T.
    Bidulský, R.
    Actis Grande, M.
    Ferraris, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1533971.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.-y
    81.20.Ev
    81.40.Np
    Opis:
    The present paper focused on the analysis of the fracture surfaces of a new development insulated iron powder compound with the addition of the aluminium alloy in order to improve the mechanical properties. Results show that in the pressed state, mainly pores act as crack initiators and due to their presence the distribution of stress is inhomogeneous across the cross-section and leads to the reduction of the effective load bearing area. Investigation of fracture surfaces concluded that improvements in bonding during the pressing process and heat treatment can be helpful in the development of soft magnetic materials to give a suitable combination between pressing pressure, annealing temperature and time as well as magnetic properties.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 800-801
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Porosity Evaluation during ECAP in Aluminium PM Alloy
    Autorzy:
    Bidulská, J.
    Kvačkaj, T.
    Bidulský, R.
    Actis Grande, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1418956.pdf
    Data publikacji:
    2012-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Bx
    81.07.Bc
    81.20.Ev
    81.40.-z
    Opis:
    The main aim of this paper is to show porosity evolution during application of various processing conditions including pressing, sintering and equal channel angular pressure. An aluminium based powder (Al-Mg-Si-Cu-Fe) was used as investigated material. After applying different pressing pressures (400 and 600 MPa), specimens were dewaxed in a ventilated furnace at 400C for 60 min. Sintering was carried out in a vacuum furnace at 610C for 30 min. The specimens were processed by single equal channel angular pressure pass. A significant disadvantage of powder metallurgy processing methods is the presence of porosity. Pores act as crack initiators and, due to their presence, the distribution of stress is inhomogeneous across the cross-section and leads to reduction of the effective load bearing area. The equal channel angular pressure process, causing stress distribution in deformed specimens, made the powder particles to squeeze together to such an extent that the initially interconnected pores transform to small isolated pores. The proposed safety diagram includes the combined effect of stress and strain behaviour during equal channel angular pressure. The "safety line" eliminates and quantifies the effect of large pores as a potential fracture initiation sites with respect to the mechanical viewpoint.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 3; 553-556
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of ECAP-Back Pressure on the Porosity Distribution
    Autorzy:
    Bidulská, J.
    Kvačkaj, T.
    Kočiško, R.
    Bidulský, R.
    Actis Grande, M.
    Donič, T.
    Martikán, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1538174.pdf
    Data publikacji:
    2010-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Bx
    81.20.Ev
    81.40.-z
    81.70.Fy
    Opis:
    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 stresses. Consequently, ECAP-BP influences the porosity distribution in terms of the severe shear deformation involved. According to the obtained results, interesting applications for this new progressive method in physical and metallurgical research fields are shown.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 5; 864-868
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the Fracture Surfaces of New Development Insulated Iron Powder Compounds
    Autorzy:
    Bidulský, R.
    Bidulská, J.
    Kvačkaj, T.
    Actis Grande, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1201089.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.-y
    81.20.Ev
    81.40.Np
    Opis:
    Goal of the present paper is the analysis of the fracture surfaces of an Insulated Iron Powder Compound (IIPC) with different additions of aluminium alloy (0.25, 0.5 and 0.75 wt.%), in order to improve the mechanical properties, evaluated as the transverse rupture strength (TRS) with sufficient magnetic properties (mainly represented by the iron loss and coercivity force). Investigation of microstructure and porosity development concluded that improvements in bending strength and impact values require the reduction of surface oxides during the heat treatment, in order to get a proper load bearing area between the adjacent particles.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 154-155
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Formability Evaluation of Aluminium Alloys by FLD Diagrams
    Autorzy:
    Petroušek, P.
    Kočiško, R.
    Kvačkaj, T.
    Bidulský, R.
    Bidulská, J.
    Fedoriková, A.
    Sabol, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032922.pdf
    Data publikacji:
    2017-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.20.Hy
    62.10.+s
    62.20.M-
    81.05.-t
    82.80.-d
    Opis:
    The goal of the present work is evaluated mechanical properties and forming limit diagrams of ambient rolled aluminium alloy based on AlMgSi. Forming limit diagrams are convenient and often used as a tool for the classification of the formability and the evaluation of the forming process of sheet materials. Forming limits of sheet metal are represented in the forming limit diagrams occurring by various deformation states. The most widely used type is the Keeler-Goodwin diagram. Input data got from static tensile test are important for formability evaluating of the thin sheet by mathematical simulations, such as tensile strength, yield strength, elongation, and the strain hardening exponent. The result is a consideration of the suitability of the material for stamping technology.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 5; 1344-1346
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Material Recovery of OFHC Cu and FeSi Steel after Processing by Plastic Deformations
    Autorzy:
    Kvackaj, T.
    Kocisko, R.
    Bidulska, J.
    Luptak, M.
    Kovacova, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032938.pdf
    Data publikacji:
    2017-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.82.Bg
    07.20.Mc
    81.20.Wk
    62.20.F-
    81.40.Ef
    Opis:
    The influence of thermoplastic processes through severe plastic deformations carried out at ambient temperature and through rolling carried out at cryogenic temperature on the recovery for two types of materials was investigated. As experimental materials, there were used oxygen free high conductivity copper and FeSi steel presenting materials with middle and high stacking fault energy, respectively. Both materials have been previously investigated, however mainly considering their material properties. In this study, oxygen free high conductivity Cu was processed by 13 passes through equal channel angular rolling which belongs to the severe plastic deformations group of methods. The rolling of FeSi steel at ambient and cryogenic temperatures was performed using a laboratory duo rolling mill, samples were rolled only by one pass. The aim of this study was to insert the strain to the materials with different stacking fault energy (middle and high) under ambient and cryogenic thermal conditions, respectively, and subsequently to observe the influence of stored energy on structural recovery of materials through differential scanning calorimetry method. This study implies that the recovery process characterized by the mobility of structural defects begins earlier for FeSi steel compared to oxygen free high conductivity Cu.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 5; 1315-1318
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of Microstructural and Mechanical Properties after Cold Rolling of an Electro-Sinter-Forged Cu-Sn Alloy
    Autorzy:
    Gobber, F. S.
    Bidulská, J.
    Fais, A.
    Franchini, F.
    Bidulský, R.
    Kvačkaj, T.
    Actis Grande, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/352541.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Electro-Sinter-Forging
    powder metallurgy
    CuSn15
    rolling
    Opis:
    Traditional press and sinter processes have gained in the last decades more and more importance in the manufacturing of high volume and precise mechanical components especially in the field of iron based powders. In recent years, the reductions of processing times and temperatures were spotted as critical targets to increase productivity and reduce energy consumption. Electric current assisted sintering (ECAS) technologies have always been seen as an alternative to traditional furnace based sintering techniques and have been the target of different researches with the specific purpose of reducing both operational times and costs. The aim of the present study is to investigate the effect of an innovative process called Electro Sinter Forging (ESF) applied to CuSn15 powders. Thanks to a very short processing time (less than 1 second to densify loose powders), this process is able to retain a very small grain size, thus enhancing mechanical properties of the processed materials. Furthermore, to the authors knowledge, cold – rolled electro – sinter – forged alloys has never been investigated before. First of all, bars were electro – sinter – forged and subsequently characterized in the as sinter – forged condition. The observation of microstructure evidenced an extremely fine microstructure and a reduced degree of porosity. Afterwards, bars were cold rolled after different reduction ratios; macrostructural integrity of the rolled bars was assessed before evaluating the effects of cold rolling on the sinter – forged microstructure.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 2; 787-792
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of the high-temperature behaviour of aluminium alloy EN AW 2014
    Wysokotemperaturowe zachowanie stopu aluminium EN AW 2014
    Autorzy:
    Bidulská, J.
    Pokorný, I.
    Kvačkaj, T.
    Grande, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/352627.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    stopy aluminium
    naprężenie płynięcia
    równanie konstytutywne
    aluminium alloy
    flow stress
    constitutive equation
    hot working
    Opis:
    The high-temperature behaviour of aluminium alloy EN AW 2014 was investigated in a wide range of deformation temperatures and strain rates. The influence of strain rate and temperature on the peak stress was analysed using the conventional constitutive equation (relating strain rate, flow stress, and temperature) and by means of precise definition of the peak stress value, in the non-linear regression model. Moreover, a study on apparent activation energy of EN AW 2014 stabilized by zirconium was carried out using Arrhenius-type plot. The stress-strain curves exhibit rapid increase up to the peak value followed by a gradual softening up to the material fracture, without the steady state usually observed before the fracture. In terms of formability maps, the presented experimental results exhibit a decrease of ductility, respectively with an increase of strain rate and a decrease of temperature, respectively.
    Wysokotemperaturowe zachowanie stopu aluminium EN AW 2014 badane było w szerokim zakresie temperatur i predkości odkształcenia. Wpływ prędkości odkształcenia i temperatury na maksymalne naprężenie analizowany był z użyciem konwencjonalnego podstawowego równania (wiazacego predkość odkształcenia, naprezenie płyniecia i temperature) oraz za pomocą precyzyjnej definicji wartości maksymalnego naprężenia w modelu regresji nieliniowej. Ponadto, analiza obserwowanej energii aktywacji stopu EN AW 2014 stabilizowanego cyrkonem przeprowadzono z użyciem wykresu typu Arrheniusa. Krzywe naprężenie-odkształcenie wykazują gwałtowny wzrost do maksymalnego naprężenia, po którym następuje stopniowe mięknięcie aż do zerwania materiału, bez obszaru stałego zwykle obserwowanego przed zerwaniem. Jesli chodzi o mapy plastycznosci, przedstawione wyniki doświadczalne wykazują spadek plastycznosci, odpowiednio ze wzrostem szybkości odkształcenia oraz ze spadkiem temperatury.
    Źródło:
    Archives of Metallurgy and Materials; 2011, 56, 4; 981-981
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Annealing Conditions on Structural Development of Cryo Rolled FeSi Steel
    Autorzy:
    Kvackaj, T.
    Bidulska, J.
    Bidulsky, R.
    Kovacova, A.
    Kocisko, R.
    Bella, P.
    Luptak, M.
    Bacso, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1367991.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Bb
    81.05.Bx
    81.40.Rs
    81.40.Ef
    Opis:
    Non grain oriented isotropic electrical steels, commercially called NGOES, were investigated in cryogenic temperature conditions. At cryogenic temperatures plastic deformations form strong structural heterogeneities in the sample thickness. Samples processed by cryo rolling show a bigger storage energy. To achieve abnormal grain growth through the process of static recrystallization, the annealing conditions were applied to the deformed samples. Moreover, minimal magnetic losses were reached when mean grain size diameter was approximately 150 μm.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 184-185
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Cryo-Rolling and Annealing on Magnetic Properties in Non-Oriented Electrical Steel
    Autorzy:
    Kvačkaj, T.
    Bella, P.
    Bidulský, R.
    Kočiško, R.
    Petroušek, P.
    Fedoriková, A.
    Bidulská, J.
    Jandačka, P.
    Lupták, M.
    Černík, M.
    Pernis, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032280.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Bb
    81.05.Bx
    81.40.Rs
    81.40.Ef
    Opis:
    The goal of the present work is to compare progressive technology - rolling at cryogenic temperature and classical rolling at ambient temperature followed by an investigation of their impact on the final microstructure and the magnetic properties of non-oriented electrical steel. Non-oriented electrical steel is characterized by high magnetic induction, low magnetic losses, and low coercivity. The best magnetic properties are achieved using preferable texture and optimal grain size. In this paper there is analyzed the percentage of different textural components after cryo-rolling and after rolling at ambient temperature. To obtain maps of inverse pole figures, the electron backscatter diffraction method was used. The main contribution of this study was that the samples rolled at cryo conditions and after final annealing reached better magnetic properties than at ambient temperature, which was reflected by low magnetic losses and coercivity.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 1105-1107
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of workability test to SPD processing
    Zastosowanie testu obrabialności do intensywnego odkształcenia plastycznego
    Autorzy:
    Kvačkaj, T.
    Kočiško, R.
    Tiža, J
    Bidulská, J.
    Kováčová, A
    Bidulský, R
    Bascó, J
    Vlado, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/351817.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    compression test
    powder metallurgy
    fracture criteria
    ECAR
    Deform 3D
    próba ściskania
    metalurgia proszków
    kryteria pękania
    Opis:
    The aluminium alloy with chemical conception AlMgSi prepared by PM (powder metallurgy) technology was used. The experiments such as a ring and compression test, ECAR (equal channel angular rolling) for determination of friction coefficient, stress-strain curves and material workability based on analytical methods (Freudenthal, Cockcroft-Latham and normalized Cockcroft-Latham criteria) were performed. Numerical simulations of sample processed by ECAR was carried out by a software Deform 3D with focus on the description of stress, strain fields and workability criteria (Cockcroft-Latham and normalized Cockcroft-Latham). The prediction of fracture formations in a real ECAR sample during processing conditions was also done.
    Stop aluminium o składzie chemicznym AlMgSi przygotowano metodą proszkową. Wykonano badania takie jak próba ściskania swobodnego pierścieni i walcowatych, ECAR (wyciskanie w kanale kątowym z walcowaniem) w celu wyznaczenia współczynnika tarcia, krzywych naprężenie-odkształcenie oraz podatności materiału na odkształcenie z użyciem metod analitycznych (kryterium Freudenthal, Cockcroft-Latham i znormalizowane Cockcroft-Latham). Symulacje numeryczne dla próbki poddawanej procesowi ECAR przeprowadzono przy pomocy oprogramowania Deform 3D z naciskiem na opis pól sił i naprężeń oraz kryteriów obrabialności (Cockcroft-Latham i znormalizowane Cockcroft-Latham). Przeprowadzono również symulacje mozliwości tworzenia się pęknięć w rzeczywistej próbce poddanej procesowi ECAR.
    Źródło:
    Archives of Metallurgy and Materials; 2013, 58, 2; 407-412
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identification of the critical pore sizes in sintered and ecaped aluminium 6XXX alloy
    Przewidywanie powstawania porowatości podczas wyciskania w kanale kątowym stopu aluminium otrzymanego metodą proszkową
    Autorzy:
    Bidulská, J.
    Kvačkaj, T.
    Pokorný, I.
    Bidulský, R
    Actis Grande, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/353976.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminium alloy
    ECAP
    porosity
    critical pore sizes
    microstructure
    fracture
    stop aluminium
    wyciskanie w kanale kątowym
    porowatość
    mikrostruktura
    pękanie
    Opis:
    The main aim of this paper is to investigate, by means of comparison of experimental studies and mathematical models, the evolution of porosity as consequence of pressing, sintering and ECAPping an aluminium based powder (6xxx). After applying the compacting pressure, specimens were dewaxed in a ventilated furnace at 400º for 60 min. Sintering was carried out in a vacuum furnace at 610ºC for 30 min. The specimens were then ECAPed for 1 pass. The 2-dimensional quantitative image analysis was carried out by means of SEM and OM for the evaluation of the aforementioned characteristics. Results show the effect of processing parameters on the fracture/microstructure behaviour of the studied aluminium PM alloy. Quantitative image analysis, as well as fractographic interpretation and microstructure identification of weak sites in the studied aluminium PM alloy, provide a reliable and reproducible statistical procedure for the identification of the critical pore sizes.
    Głównym celem pracy jest badanie zmian porowatości podczas prasowania, spiekania i wyciskania przez kanał katowy proszku na bazie aluminium (Ai-Mg-Si-Cu-Fe) za pomocą eksperymentu i symulacji numerycznych. Po przyłożeniu ciśnienia podczas zagęszczania usuwano lepiszcze z próbek w piecu w temperaturze 400ºC przez 60 minut. Spiekanie prowadzono w piecu próżniowym w temperaturze 610ºC przez 30 min. Próbki następnie były wyciskane przez kanał kątowy w jednym przejściu. Dwuwymiarowa ilościową analizę obrazu przeprowadzono za pomocą skaningowej mikroskopii elektronowej i mikroskopii optycznej w celu oceny wyżej wymienionych właściwości. Wyniki opisują wpływ parametrów procesu na pękanie/ mikrostrukturę badanego proszku stopu aluminium. Ilościowa analiza obrazu, jak równiez mikrostruktury w badanym stopie proszku aluminium zapewniają wiarygodne i statystycznie powtarzalne procedury dla identyfikacji miejsc inicjacji pękania.
    Źródło:
    Archives of Metallurgy and Materials; 2013, 58, 2; 371-375
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-15 z 15

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