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    Wyświetlanie 1-12 z 12
    Tytuł:
    Microstructural Characterization of the As-cast AZ91 Magnesium Alloy with Rare Earth Elements
    Autorzy:
    Grzybowska, A.
    Braszczyńska-Malik, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/382210.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Mg-Al-Zn alloy
    rare earth elements
    microstructure
    stop Mg-AI-Zn
    pierwiastki ziem rzadkich
    mikrostruktura
    Opis:
    Microstructural analysis of as-cast Mg-9Al-0.9Zn-xRE (x = 0, 1, 2, 3, 5 wt.%) magnesium alloys is presented. Light microscopy (LM) and scanning electron microscopy (SEM+EDX) were used to characterized the obtained material. The results revealed that the as-cast AZ91 alloy consists of α – Mg matrix, binary eutectic α + γ (where γ is Mg17Al12). While rare earth elements were introduced to the Mg-Al-Zn alloy new Al11RE3 phase was formed. Additionally, in the experimental alloys instead of Al-Mn phase, ternary Al-Mn-RE compound was observed. What is more, the influence of RE addition on the area fraction of eutectic and needle-like phase was analysed. With increasing addition of RE, the amount of γ phase decreased, but the amount of Al11RE3 phase increased.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 2s; 23-26
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure and Mechanical Properties of Duplex Structured Mg-Li-Zn-Y Alloys
    Autorzy:
    Su, J.
    Yang, Y.
    Fu, X.
    Ma, Q.
    Ren, F.
    Peng, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/381787.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    alloy Mg-Li-Zn-Y
    microstructure
    mechanical properties
    extruded
    stop Mg-Li-Zn-Y
    mikrostruktura
    właściwości mechaniczne
    wytłaczanie
    Opis:
    As-cast Mg-6Li-0.3Zn-0.6Y and Mg-6Li-1.2Zn-1.2Y (wt%) alloys were prepared and extruded at 260 ºC with an extrusion ratio of 25. The microstructure and mechanical behavior of as-cast and extruded alloys are reported and discussed. The results show that Mg-6Li-1.2Zn- 1.2Y alloy is composed of α-Mg, β-Li, and W-Mg3Zn3Y2 phases while Mg-6Li-0.3Zn-0.6Y alloy contains α-Mg, β-Li, W-Mg3Zn3Y2 phase and X-Mg12ZnY. After hot extrusion, the microstructure of specimens is refined and the average grains size of extruded alloys is 15 μm. Dynamic recrystallization occurs during the extrusion, leading to grain refinement of test alloys. Both the strength and elongation of test alloys are improved by extrusion. The extruded Mg-6Li-0.3Zn-0.6Y alloy possesses an ultimate strength of 225 MPa with an elongation of 18% while the strength and elongation of Mg-6Li-1.2Zn-1.2Y alloy are 206 MPa and 28%, respectively. The X-phase in Mg-6Li-0.3Zn- 0.6Y is beneficial to the improvement of strength, but will lead to the decrease of ductility.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 1; 181-185
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phase Transformation Analysis of the Amorphous Mg72Zn24Ca4 Alloy
    Autorzy:
    Lelito, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/947620.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Mg-Zn-Ca alloy
    amorphous alloy
    metallic glass
    crystallization
    stop Mg-Zn-Ca
    stop amorficzny
    szkło metaliczne
    krystalizacja
    Opis:
    The paper presents research of metallic glass based on a Mg72Zn24Ca4 alloy. Metallic glass was prepared using induction melting and further injection on a spinning copper wheel. The X-ray diffractometer and differential scanning calorimeter (DSC) were used to investigate the phase transformation of the amorphous ribbon. The heat released in the crystallization process, during isothermal annealing, based on the differential scanning calorimeter investigation, was determined to be 166.18 Jg-1. The effect of isothermal annealing temperature on the kinetics of the amorphous alloy crystallization process using differential scanning calorimeter was investigated. For this purpose, two isothermal annealing temperatures were selected. The incubation time decreases as the temperature of the isothermal annealing increases from 300 to 252 seconds. The same relationship is visible in the case of duration of the phase transformation, which also decreases as the temperature of the isothermal annealing increases from 360 to 228 seconds. The obtained results show a significant influence of isothermal annealing temperature on the degree of phase transformation.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 3; 21-24
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Partially Melted Zone in Mg-Al Type Alloy After Gas-tungsten Arc Welding
    Autorzy:
    Braszczyńska-Malik, K. N.
    Przełożyńska, E.
    Mróz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/381760.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Mg-Al-Zn alloy
    gas tungsten arc welding
    partially melted zone
    stop Mg-Al-Zn
    spawanie łukowe
    strefa przetopienia
    Opis:
    The gas-tungsten arc (GTA) welding behaviors of the commercial AZ91 magnesium alloy were examined in terms of microstructure characteristics. This study focused on the effects of the GTAW process parameters (like welding current, welding speed and method of additional cooling of the welded samples) on the size of the fusion zone (FZ) and partially melted zone (PMZ). The PMZ morphology of the eutectic regions changed from less to more divorced in the direction from the FZ to the base metal. The largest PMZ was obtained at a low welding speed (3.33 mm/s) and without additional water cooling of the samples.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 2 spec.; 18-21
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Eutectic Structures Competition in the Stripes Strengthening the (Zn) – Single Crystal
    Autorzy:
    Wołczyński, W.
    Kjelstrup, S.
    Bedeaux, D.
    Szajnar, J.
    Billia, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/380972.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    eutectic structure selection
    Zn
    single crystal
    branching phenomenon
    Opis:
    Some eutectic stripes have been generated in a hexagonal (Zn) - single crystal. The stripes are situated periodically with the constant inter stripes spacing. The eutectic structure in the stripes consists of strengthening inter-metallic compound, Zn16Ti, and (Zn) – solid solution. The rod-like irregular eutectic structure (with branches) appears at low growth rates. The regular lamellar eutectic structure is observed at middle growth rates. The regular rod-like eutectic structure exists exclusively in the stripes at some elevated growth rates. A new thermodynamic criterion is recommended. It suggests that this eutectic regular structure is the winner in a morphological competition for which the minimum entropy production is lower. A competition between the regular rod-like and the regular lamellar eutectic growth is described by means of the proposed criterion. The formation of branches within irregular eutectic structure is referred to the state of marginal stability. A continuous transitions from the marginal stability to the stationary state are confirmed by the continuous transformations of the irregular eutectic structure into the regular one.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 4; 95-102
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Properties of 7xxx Series Alloys Formed by Alloying Additions
    Autorzy:
    Kwak, Z.
    Rzadkosz, S.
    Garbacz-Klempka, A.
    Perek-Nowak, M.
    Krok, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/382838.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    variation of the properties
    quality of ingots
    Al-Zn-Mg-Cu alloy
    microstructure
    jakość wlewków
    stop Al-Zn-Mg-Cu
    mikrostruktura
    Opis:
    Currently there is a constant development in the field of aluminium alloys engineering. This results from, i.a., better understanding of the mechanisms that direct strengthening of these alloys and the role of microalloying. Now it is microalloying in aluminum alloys that is receiving a lot of attention. It affects substantially the macro- and microstructure and kinetics of phase transformation influencing the properties during production and its exploitation. 7xxx series aluminum alloys, based on the Al-Zn-Mg-Cu system, are high-strength alloys, moreover, the presence of Zr and Sr further increases their strength and improves resistance to cracking. This study aims to present the changes of the properties, depending on the alloy chemical composition and the macro- and microstructure. Therefore, the characteristics in the field of hardness, tensile strength, yield strength and elongation are shown on selected examples. Observations were made on ingot samples obtained by semi-continuous casting, in the homogenized state. Samples were prepared from aluminum alloys in accordance with PN-EN 573-3: 2013. The advantage of Al-Zn-Mg-Cu alloys are undoubtedly good strength, Light-weight and resistance to corrosion. As widening of the already published studies it is sought to demonstrate the repeatability of the physical parameters in the whole volume of the sample.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 2; 59-64
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Researching the Influence of Chemical Composition and Technological Parameters on the Quality of Copper Alloys
    Autorzy:
    Rzadkosz, S.
    Kozana, J.
    Kranc, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/379548.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    copper alloy
    Cu-Zn alloy
    mechanical properties
    alloying additives
    alloy refining
    stop miedzi
    stop Cu-Zn
    właściwości mechaniczne
    dodatki stopowe
    rafinacja stopu
    Opis:
    The work presents the results of process efficiency of refining liquid copper with special refining agents and the analysis results of the influence of alloying components on the structure and properties of the chosen alloys. The research undertaken aimed at evaluation of the influence of alloying additives, such as aluminium, silicon and also cobalt in the chosen Cu-Zn alloys. The microstructures were researched with the help of light and scanning microscopy together with X-ray microanalysis to determine significant changes of mechanical properties.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 1 spec.; 153-158
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Crystal Segregation During Casting of the Alloy AlZn5.5Mg2.5Cu1.5
    Autorzy:
    Weiss, V.
    Svobodova, J.
    Cais, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/382136.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    theory of crystallization
    heat treatment
    homogenizing annealing
    crystal segregation
    alloy Al-Zn-Mg-Cu
    krystalizacja
    obróbka cieplna
    wyżarzanie
    stop Al-Zn-Mg-Cu
    Opis:
    In the course of homogenizing annealing of aluminium alloys being cast continually or semi-continually it appears that chemical inhomogenity takes off within separate dendritic cells (crystal segregation). It is about a diffusion process that takes place at the temperature which approaches the liquid temperature of the material. In that process the transition of soluble intermetallic compounds and eutectic to solid solution occurs and it suppresses crystal segregation significantly [1]. The temperature, homogenization time, the size of dendritic cells and diffusion length influences homogenizing process. The article explores the optimization of homogenizing process in terms of its time and homogenizing annealing temperature which influence mechanical properties of AlZn5,5Mg2,5Cu1,5 alloy.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 2; 63-68
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of the Influence of Additions on the Formation of Microstructure of Al-Zn-Mg-Cu Alloys
    Autorzy:
    Pisarek, B. P.
    Czekaj, E.
    Pacyniak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/381528.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative casting material
    innovative casting technology
    Al-Zn-Mg-Cu alloy
    TDA method
    hardness HB
    innowacyjny materiał odlewniczy
    innowacyjna technologia odlewnicza
    stop Al-Zn-Mg-Cu
    metoda ATD
    Opis:
    The article presents the investigations of 7xxx aluminium alloys performed by the method of thermal and derivational analysis. The studies made it possible to identify the effect of the changes in the Cu concentration, the total Zn and Mg weight concentrations and the Zn/Mg weight concentration ratio on their crystallization process: the cooling as well as the kinetics and dynamics of the thermal process of cooling and crystallization. Metallographic studies were performed on the microstructure of the examined alloys and their HB hardness was measured. The evaluation of the changes was presented in reference to the model alloys EN AW-7003 and EN AW-7010, whose microstructure under the conditions of thermodynamic equilibrium are described by the phase diagrams: Al-Zn-Mg and Al-Zn-Mg-Cu. The performed investigations confirmed that the hardness HB of the examined alloys is mainly determined by the reinforcement of the matrix αAl by the introduced alloy additions and the presence of phases Θ(Al2Cu) and S(Al2CuMg) rich in copper, as well as η(MgZn2), in the examined alloys' microstructure. The increase of the amount of intermetallic phases precipitated in the microstructure of the examined alloys is caused, beside Cu, by the characteristic change of Zn wt. concentration and Mg. It was proposed that the process of one-stage thermal treatment of the examined alloys be introduced at a temperature of up to tJ-20 °C, which will prevent the exceedance of the solidus temperature.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 4; 39-44
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ dodatków stopowych na mikrostrukturę i właściwości stopów serii 7xxx
    The Effect of Alloying Elements on the Microstructure and Properties 7xxx Series Alloys of Selected Examples
    Autorzy:
    Kwak, Z.
    Rzadkosz, S.
    Garbacz-Klempka, A.
    Krok, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/379869.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    stopy Al-Zn-Mg-Cu
    dodatki stopowe
    własności mechaniczne
    badania nieniszczące
    jakość wlewków
    Opis:
    Celem pracy jest przedstawienie zmienności podstawowych właściwości, takich jak: średniej wielkości ziarna, twardości, wytrzymałości na rozciąganie, granicy plastyczności i wydłużenia stopów aluminium, w zależności od składu chemicznego, w oparciu o stopy serii 7xxx, zgodnie z normą PN-EN 573-3:2013, na wybranych przykładach. Uwagę skupiono przede wszystkim na ocenie jakości wlewków wykonanych ze stopów EN AW-7003 oraz EN AW-7010. Badania i obserwacje prowadzono na próbkach pobranych z wlewków homogenizowanych, o średnicach ø224 i ø254 mm, wykonanych w Zakładzie Wlewków Grupy KĘTY S.A. z siedzibą w Kętach. Badania składu chemicznego, właściwości wytrzymałościowych, makro- oraz mikrostruktury otrzymanych prób przeprowadzono w Centrum Badawczo-Rozwojowym Grupy KĘTY. Uzupełniające badania składu chemicznego i mikrostruktury wykonano w Laboratorium Naukowo- Dydaktycznym Badań Metali, Stopów i Zabytków Metalowych na Wydziale Odlewnictwa Akademii Górniczo-Hutniczej w Krakowie, w Katedrze Tworzyw Formierskich, Technologii Formy i Odlewnictwa Metali Nieżelaznych. Stopy aluminium należą obecnie do szeroko stosowanych tworzyw w różnych gałęziach przemysłu. Ma na to wpływ ciągłe doskonalenie procesów rafinacji i modyfikacji. Skład chemiczny analizowanych wlewków mieści się w granicach ujętych normą, co świadczy o właściwym przygotowaniu procesu produkcji. Przeprowadzenie kompletnej analizy jest jednak trudne z powodu równocześnie zmieniających się wielu parametrów procesu produkcyjnego.
    The main purpose of this thesis is to present a variation of the basic properties of aluminium alloys depending on the chemical composition based on the 7xxx series alloys, according with PN-EN 573-3:2013. Attention is focused primarily on the quality of ingots made of alloys EN AW-7003 and EN AW-7010. Studies and observations were carried out on samples taken from the homogenised ingots. The study of chemical composition, mechanical properties, the macro - and microstructure was conducted at Centre for Research and Development Group KĘTY. Supplement testing of the chemical composition and microstructure were performed in the Science and Teaching Laboratory of Metals, Alloys and Metal Monuments at Faculty of Foundry Engineering of University of Science and Technology in Krakow, in the Department of Moulding Materials, Mould Technology and Cast Non-Ferrous Metal. Nowadays aluminum alloys are widely used in various areas of industry. This is influenced by the continuous improvement of the refining and modification processes. Chemical composition of analyzed ingots is within the recognized standard, which proves that appropriate preparation of the production of ingots. Carry out a complete analysis is difficult because at the same time changing many of parameters.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 4 spec.; 83-88
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enhancement of Heat Transfer in PCM by Cellular Zn-Al Structure
    Autorzy:
    Naplocha, K.
    Koniuszewska, A.
    Lichota, J.
    Kaczmar, J. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/382339.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry technology
    innovative foundry material
    metal cellular foam
    porous Zn-Al structure
    investment casting
    heat transfer
    innowacyjna technologia odlewnicza
    innowacyjny materiał odlewniczy
    pianka metalowa
    struktura porowata Zn-Al
    odlewanie precyzyjne
    wymiana ciepła
    Opis:
    Development of open cellular metal foam technology based on investment casting applying the polyurethane pattern is discussed. Technological process comprises preparing of the ceramic mold applying PUR foam as the pattern, firing of the mold, pouring of the liquid Zn-Al alloy into the mold and washing out of the ceramic material from cellular casting. Critical parameters such as the temperature of mold and poured metal, design of gating system affected by metalostatic pressure allowed to produce castings with cellular structure characterized by the open porosity. Metal cellular foams with the open porosity embedded in phase change material (PCM) enhance heat transfer and reduce time operations in energy storage systems. Charging and discharging were performed at the laboratory accumulator by heating and cooling with flowing water characterized by the temperatures of 97-100ºC. Temperature measurements were collected from 7 different thermocouples located in the accumulator. In relation to the tests with pure paraffin, embedding of the metal Zn-Al cellular foam in paraffin significantly decreases temperature gradients and melting time of paraffin applied as PCM characterized by the low thermal conductivity. Similarly, reduction of discharging time by this method improves the efficiency of thermal energy storage system applied in solar power plants or for the systems of energy efficient buildings.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 4; 91-94
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tribological Wear of as Cast Zn-4Al Alloy Cooled at Various Rates from the Eutectoid Transformation Temperature
    Autorzy:
    Lachowicz, M. M.
    Leśniewski, T.
    Lachowicz, M. B.
    Jasionowski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1837868.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metallography
    microstructure
    heat treatment
    abrasive wear
    Zinc alloys
    Zn-4Al
    metalografia
    mikrostruktura
    obróbka cieplna
    zużycie ścierne
    stopy cynku
    Opis:
    The paper presents the results from a study on the impact of the cooling rate in the eutectoid transition on the abrasive wear of the as cast Zn-4Al alloy. The microstructure of the researched material consists of dendrites of the η solid solution and an (α+η) eutectic structure. During the eutectoid transformation at 275oC the distribution in the eutectic structure was transformed and fined. Heat treatment was carried out for this alloy, during which three cooling mediums were used, i.e. water, air and an furnace. For the research material obtained in this way, metallographic examinations were performed using the methods of light and scanning electron microscopy, as well as hardness measurements. It was found that faster cooling rate promoted the fragmentation of structural components, which translates into higher hardness of the material. This also had effects in the tribological wear of the tested alloy. As part of the tests, an abrasive wear test was carried out on a standard T-07 tester.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 4; 108-114
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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