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    Wyświetlanie 1-16 z 16
    Tytuł:
    Microstructural characterization of cast magnesium matrix composites by Raman microscopy
    Autorzy:
    Malik, M. A.
    Braszczyńska-Malik, K. N.
    Majchrzak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/380033.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    magnesium matrix composites
    SiC
    Mg2Si
    Raman spectroscopy
    kompozyt magnezowy
    spektroskopia Ramana
    Opis:
    Cast magnesium matrix composites reinforced with silicon carbide particles were investigated by using Raman microscopy. 3C, 4H and 6H polytypes of SiC particles were identified in the investigated composites. Additionally, Mg2Si compound was detected by Raman microscopy in the composites microstructure.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 1; 95-98
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Aluminosilcate glass cenospheres as a component of cast magnesium matrix composites
    Autorzy:
    Kamieniak, J.
    Żydek, A.
    Braszczyńska-Malik, K. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/382002.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    AZ91 magnesium alloy
    aluminosilicate cenospheres
    metal matrix composite
    stop magnezu AZ91
    mikrosfera glinokrzemianowa
    kompozyt metalowy
    Opis:
    The main characteristic of aluminosilicate glass cenospheres and their possible use as a component of magnesium matrix composites were presented. The results revealed that particular parts of cenospheres differ insignificantly from each other and it depends on which power plant cenospheres come from. The characteristic of cenospheres concerned their structure and phase composition and dimensions such as: wall thickness and size of pores occurring in walls, depending on cenospheres origin. Thickness of cenospheres walls and pore size were measured by using ImageJ computer software. The structure of aluminosilicate glass cenospheres and their phase composition have been investigated by scanning electron microscopy and X-ray diffraction (XRD). The possibility of cenospheres utilization in the fabrication of magnesium matrix composites was presented on the example of AZ91 magnesium alloy composite with fly ash cenospheres. Composite was fabricated by pressure infiltration method.
    Źródło:
    Archives of Foundry Engineering; 2011, 11, 2 spec.; 109-112
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterisation of Microstructure of We43 Magnesium Matrix Composites Reinforced with Carbon Fibres
    Autorzy:
    Gryc, A.
    Rzychoń, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/352456.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metal matrix composite
    magnesium
    WE43
    carbon fibre
    heat treatment
    Opis:
    In the paper the microstructures of WE43 matrix composites reinforced with carbon fibres have been characterised. The influence of reinforcement type and T6 heat treatment (a solution treatment at 525°C for 8 h, a hot water quench and a subsequent ageing treatment at 250°C for 16 h) on microstructure have been evaluated. The light microscope and scanning electron microscope investigations have been carried out. No significant differences in samples reinforced with non-coated textiles have been reported. The substantial changes in sample reinforced with nickel-coated textile have been observed. The segregation of alloying elements to the matrix-reinforcement layer has been identified. The T6 heat treatment caused the appearance of disperse precipitates of β phase, but the process cannot be considered as satisfactory (irregular distribution, low volume fraction, relatively large size).
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2B; 1075-1081
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Possibilities of Fabricating Mg-Al-RE Cast Magnesium Matrix Composites Reinforced with Ti Particles
    Autorzy:
    Przełożyńska, E.
    Braszczyńska-Malik, K. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/379632.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    magnesium matrix composite
    Mg-Al-Mn alloy
    rare earth elements (REE)
    Ti particle
    microstructure investigations
    kompozyt magnezowy
    stop Mg-Al-Mn
    pierwiastki ziem rzadkich
    cząstka Ti
    badania mikrostruktury
    Opis:
    The results of microstructure investigations of an experimental magnesium matrix composite reinforced with Ti particles are presented. The experimental Mg-5Al-5RE magnesium alloy was used as the matrix alloy. The examined composite was reinforced with 30 wt% titanium spherical particles. The investigated material was obtained by the stir-casting method. The microstructure of the fabricated composite was characterized by a uniform arrangement of the Ti particles within the magnesium matrix. No new phases (created due to reaction between the matrix and Ti particles) were revealed by XRD techniques.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 3 spec.; 73-76
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical Properties Enhancement of Particle Reinforced Magnesium Matrix Composites Used for Hot Extruded Tubes
    Autorzy:
    Huang, S.
    Hwang, Y.
    Huang, Y.
    Huang, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1192392.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Bx
    81.20.Ev
    81.20.Hy
    Opis:
    This paper studies new magnesium metal matrix composites (Mg MMCs) reinforced with SiC particles by the stir-casting method for MMCs tubes hot extrusion. AZ61/SiCp MMCs' ingots reinforced with 0, 0.5 and 1 wt.% SiC particles are fabricated by the melt-stirring technique. AZ61/SiCp MMCs' tubes are manufactured by hot extrusion using a specially designed die-set. Obvious grain size refinement both by addition of particles and extrusion process are discovered. However, the grain refinement effect caused by extrusion process is much significant than that effect caused by SiC particle addition. The 0.2% yield strength (YS) of extruded tubes of AZ61 and AZ61/1 wt.% SiCp MMCs (without and with T5 treatment) are increased by 140.9-161.9% and 156.5-156.7%, respectively, compared with those of as-cast billets.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1271-1273
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Machinability Studies on the Turning of Magnesium Metal Matrix Composites
    Autorzy:
    Gobivel, K.
    Vijay Sekar, K.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2125540.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Mg-SiCp composite
    cutting forces
    surface quality
    chip microstructure
    tool morphology
    Opis:
    Magnesium-based MMCs are widely used in structural-based applications due to their lightweight, high hardness, corrosion and wear resistance. Also, machining is an important manufacturing process that is necessary to ensure dimensional accuracy and produce intricate shapes. In this context, the machining of Magnesium based metal matrix composites is undertaken to study the impact of the cutting parameters on the machinability behaviour. In this work, turning of pure Mg/SiCp on a Lathe is done and an in-depth assessment on the machining forces, machined surface quality, chip microstructure, and tool morphology has been carried out using TiAlN coated tooling insert. The analysis revealed that the thrust force decreased due to the thermal softening of the matrix meanwhile the feed force also followed the similar trend at higher cutting speeds because of the minimized built-up edge and cutting depth whereas principal cutting force was inconsistent at higher cutting speeds. The surface finish was better at high cutting speed - low feed combination. The chip microstructure revealed that gross fracture propagation at the free surface and variations in the shear bands have occurred at different cutting speeds. Tool studies using SEM analysis revealed wear modes like chipping and built-up edge at low cutting speeds, but with a reduced impact at intermediate cutting conditions, whereas abrasion wear was observed predominantly in the tool nose at higher cutting speeds.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 3; 939--948
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnesium Matrix Composite with Open-Celled Carbon Foams Obtained by Powder Metallurgy
    Autorzy:
    Olszówka-Myalska, A.
    Myalski, J.
    Godzierz, M.
    Wrześniowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/351489.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    magnesium matrix composites
    ceramic-metal interpenetrating composite
    open-celled carbon foam
    powder metallurgy
    Opis:
    The preliminary results of the application of open-celled glassy-carbon foam (Cof) in magnesium matrix composites processed by the powder metallurgy method were presented. For the component consolidation, compaction with vertically-torsional vibration and hot-pressing were applied. For the material characterization, the microstructure examination LM and SEM with EDS was employed and also, the porosity and microhardness were measured. An influence of the carbon foam cells’ size on the composite porosity and microhardness was revealed. Additionally, a generation of a few micrometer thin and differently shaped MgO inclusions was observed. Differences in the oxide phase amount, size and shape in the magnesium matrix measured by the quantitative metallography method in the cross-sectioned composite elements were stated. With an increase of the distance from the composite roller top, an increase of the MgO content and microhardness was noticed.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 2; 825-831
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructural analysis of AM50/Mg2Si cast magnesium composites
    Autorzy:
    Malik, M. A.
    Majchrzak, K.
    Braszczyńska-Malik, K. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/380454.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    stop magnezu AM50
    Mg2Si
    krzemek magnezu
    kompozyt metalowy
    AM50 magnesium alloy
    magnesium silicide
    metal matrix composites
    Opis:
    AM50/Mg2Si composites containing 5.7 wt. % and 9.9 wt. %. of Mg2Si reinforcing phase were prepared successfully by casting method. The microstructure of the cast AM50/Mg2Si magnesium matrix composites was investigated by light microscopy and X-ray diffractometry (XRD). The microstructure of these composites was characterized by the presence of \alfa-phase (a solid solution of aluminium in magnesium), Mg17Al12 (\gamma-phase), Al8Mn5 and Mg2Si. It was demonstrated that the Mg2Si phase was formed mainly as primary dendrites and eutectic.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 4; 109-112
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characteristics of production methods of aluminium and magnesium matrix composite castings
    Charakterystyka metod wytwarzania aluminiowych i magnezowych odlewów kompozytowych
    Autorzy:
    Gawdzińska, K.
    Łapawa, R.
    Szymanski, P.
    Bejger, A.
    Nozdrzykowski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/195091.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
    Tematy:
    metal composites
    manufacturing technologies
    aluminium
    magnesium
    kompozyty metalowe
    technologie wytwarzania
    magnez
    Opis:
    Light metal (aluminium and magnesium) matrix composites in particular are being increasingly used in various kinds of transportation vehicles. The properties of final products are closely related to the employed production technology. This paper presents a brief review of the technologies used in aluminium and magnesium matrix composite casting, with a focus on the risks and benefits of each technology.
    Kompozyty metalowe, a w szczególności o osnowie z metali lekkich (jak aluminium i magnez), są obecnie coraz częściej stosowane w różnego typu środkach transportu. Właściwości gotowych wyrobów są ściśle powiązane z ich technologią wytwarzania. W niniejszej pracy przedstawiono krótki opis technologii odlewów kompozytowych o osnowie aluminiowej i magnezowej, koncentrując się na wadach i zaletach poszczególnych technologii.
    Źródło:
    Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika; 2018, z. 90 [298], 3; 285-296
    0209-2689
    2300-5211
    Pojawia się w:
    Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of process temperature on AZ91 matrix microstructure of composites with aluminosilicate glass cenospheres
    Autorzy:
    Kamieniak, J.
    Żydek, A.
    Braszczyńska-Malik, K. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/380096.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    AZ91 magnesium alloy
    metal matrix composite
    glass cenosphere
    stop magnezu AZ91
    kompozyt metalowy
    cenosfera
    Opis:
    AZ91 magnesium alloy matrix composites with aluminosilicate glass cenospheres were fabricated successfully by the pressure infiltration method. Different parameters of the fabrication process, such as temperature of the mould and temperature of cenospheres were used. Influence of the temperature variation of particular parameters on the microstructure has been investigated. The microstructure of AZ91 magnesium alloy and fabricated composites have been investigated by light microscopy (LM) and scanning electron microscopy (SEM). The results revealed that AZ91 magnesium alloy consists of α-Mg matrix and eutectic α-Mg17Al12 and a small amount of discontinuous precipitates of γ phase. The microstructure of matrix AZ91 in fabricated composites is characterized also by the presence of α-Mg matrix and eutectic α-Mg17Al12. However, in the composite fabricated by using the mould heated to 500 °C more discontinuous precipitates of γ phase were observed.
    Źródło:
    Archives of Foundry Engineering; 2011, 11, 3 spec.; 107-110
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Recent studies on particulate reinforced AZ91 magnesium composites fabricated by stir casting – a review
    Autorzy:
    Matta, Anil Kumar
    Koka, Naga Sai Suman
    Devarakonda, Sameer Kumar
    Powiązania:
    https://bibliotekanauki.pl/articles/1819193.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    AZ91
    ceramics
    metal matrix composites
    magnesium composites
    particle reinforcement
    stir casting
    ceramika
    kompozyty z osnową metalową
    kompozyty magnezowe
    zbrojenie cząstkami
    odlewanie suspensji
    Opis:
    Magnesium Metal Matrix Composites (Mg MMC) have been the focus of consideration by many researchers for the past few years. Many applications of Mg MMCs were evolved in less span of time in the automotive and aerospace sector to capture the benefit of high strength to weight ratio along with improved corrosion resistance. However, the performance of these materials in critical conditions is significantly influenced by several factors including the fabrication methods used for processing the composites. Most of the papers addressed all the manufacturing strategies of Mg MMC but no paper was recognized as a dedicated source for magnesium composites prepared through STIR casting process. Since STIR casting is the least expensive and most common process in the preparation of composites, this paper reviews particulate based Mg MMCs fabricated with STIR casting technology. AZ91 series alloys are considered as the matrix material while the effect of different particle reinforcements, sizes, weight fractions on mechanical and tribological responses are elaborated in support with micro structural examinations. Technical difficulties and latest innovations happened during the last decade in making Mg MMCs as high performance material are also presented.
    Źródło:
    Journal of Mechanical and Energy Engineering; 2020, 4, 2; 115--126
    2544-0780
    2544-1671
    Pojawia się w:
    Journal of Mechanical and Energy Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Processing of Porous NiTi Preforms for NiTi/Mg Composites
    Autorzy:
    Kucharczyk, A.
    Naplocha, K.
    Tomanik, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/352563.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metal matrix composite
    magnesium
    nitinol
    SHS
    squeeze casting
    Opis:
    NiTi alloys are successfully used in engineering and medical applications because of their properties, such as shape memory effect, superelasticity or mechanical strength. A composite with Mg matrix, due to its vibration damping properties, can be characterized by low weight and good vibration damping properties. In this study, a combination of two techniques was used for successful fabrication of Mg composite reinforced by NiTi alloy preform. The porous preforms synthesized by Self-propagating Hightemperature Synthesis (SHS) from elemental powders were subsequently infiltrated with Mg by squeeze casting. The effects were examined with scanning electron microscope with EDS detector, X-ray diffraction and microindentation. The inspection has shown well-connected matrix and reinforcement; no reaction at the interface and open porosities fully infiltrated by liquid Mg. Moreover, analysis of samples’ fracture has exhibited that crack propagates inside the Mg matrix and there is no detachment of reinforcement.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 2; 747-752
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of TiC Reinforcement on Wear Resistance of Magnesium Matrix Composite by FSP
    Autorzy:
    Singh, Balraj
    Singh, Jagdev
    Singh, Ravinder Joshi
    Powiązania:
    https://bibliotekanauki.pl/articles/2048864.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    friction stir processing
    FSP
    wear behavior
    surface composites
    Mg composites
    TiC composite
    Opis:
    In the current study, wear performance of pure magnesium (Mg) and composite fabricated with titanium carbide (TiC) reinforcement is investigated under various loading and sliding velocity conditions. The Mg-matrix composite is prepared by friction stir processing (FSP) carried out at optimized values of process parameters. Sliding wear tests on Mg and friction stir processed (FSPed) Mg+TiC surface composite were done on pin-on-disc configuration. The consequence of the normal load applied and sliding velocity on wear behaviour of the two materials is evaluated by performing the tests at two normal loads of 6 N and 12 N and three sliding speeds of 0.5 m/s, 1.5 m/s and 4.5 m/s. FSPed composite found to exhibit an enhanced wear resistance as compared to that of pure Mg. To get an insight into the possible types of mechanisms for wear of the composites sample under varying load and sliding speeds conditions, the worn test specimens are subjected to scanning electron microscopy (SEM). SEM/EDS analysis revealed that oxidation, ploughing, trailing edge and 3-body abrasive wear were the predominant mechanisms for the wear of samples at a different set of experimental conditions. The tensile strength of the FSPed surface composite was found to be 25% higher than pure Mg. Wear resistance was found to increase by about 33%.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 1; 293-302
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quasi-Static and Dynamic Testing of Carbon Fiber Reinforced Magnesium Composites
    Autorzy:
    Ranachowski, Z.
    Ranachowski, P.
    Brodecki, A.
    Kopeć, M.
    Kudela, S. jr.
    Powiązania:
    https://bibliotekanauki.pl/articles/351742.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Mg matrix composite
    compressive properties
    carbon fiber
    Split-Hopkinson Pressure Bar
    Opis:
    Two types of composites, consisting of pure magnesium matrix reinforced with two commercially used carbon fibers, were systematically studied in this paper. The composites fabricated by the pressure infiltration method, were subjected to quasistatic and dynamic compression tests. Morphology of fiber strands was observed using scanning electron microscope (SEM). The application of carbon fibre reinforcement led to the stiffening of tested materials, resulting in the limitation of the possible compression to approx. 2.5%. The performed tests revealed the remarkable difference in compression strength of investigated compositions. The cause of that effect was that GRANOC fiber reinforced composite exhibited insufficient bond quality between the brittle fibers and the ductile matrix. T300 reinforced composite presented good connection between reinforcement and matrix resulting in increased mechanical properties. Investigated composites demonstrated higher mechanical strength during deformation at high strain rates. Microscopic observations also proved that the latter fibers with regular shape and dense packaging within the filaments are proper reinforcement when designing the lightweight composite material.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 2; 893-899
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hybrydowa technologia HPDC&HSC
    Hybrid HPDC&HSC technology
    Autorzy:
    Dudek, Piotr
    Sobczak, Jerzy J.
    Powiązania:
    https://bibliotekanauki.pl/articles/391767.pdf
    Data publikacji:
    2019
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
    Tematy:
    odlewanie pod wysokim ciśnieniem
    prasowanie w stanie ciekłym
    stopy aluminium
    stopy magnezu
    kompozyty metalowe
    High Pressure Die Casting
    Squeeze Casting
    aluminum alloys
    magnesium alloys
    metal matrix composites
    Opis:
    W artykule przedstawiono rys historyczny oraz stan obecny technologii odlewania z wykorzystaniem ciśnienia zewnętrznego na przykładzie odlewania pod wysokim ciśnieniem (High Pressure Die Casting – HPDC) oraz prasowania w stanie ciekłym (Squeeze Casting – SC). Wykazano podobieństwa i różnice obu technologii oraz obszary wspólne, które zostały wykorzystane do budowy współczesnych, hybrydowych maszyn łączących cechy HPDC i SC. Ostatnie lata przyniosły rozwój konstrukcji maszyn ciśnieniowych, które umożliwiły hybrydyzację technologii z wysoką elastycznością procesu, polegającą na wyborze takiego sposobu przyłożenia ciśnienia zewnętrznego, w którym można pełniej wykorzystać jego wpływ jako czynnika termodynamicznego. Zaprezentowano doświadczenia w zakresie prasowania w stanie ciekłym i stało-ciekłym, uzyskane w badaniach prowadzonych w Instytucie Odlewnictwa w Krakowie.
    The article presents the history and current state of the technology of external pressure casting in the case of High Pressure Die Casting (HPDC) and Squeeze Casting (SC). The similarities and differences between the two technologies and the common areas that were used in the construction of modern hybrid machines combining the features of HPDC and SC were shown. Recent years have seen the development of pressure machine designs that have enabled the hybridisation of technologies with high flexibility of the process, consisting in the choice of such a method of applying external pressure in which its influence can be more effectively used as a thermodynamic factor. The following experiments were presented in the field of liquid and solid-liquid casting, obtained from research conducted at the Foundry Research Institute in Kraków.
    Źródło:
    Prace Instytutu Odlewnictwa; 2019, 59, 1; 21-36
    1899-2439
    Pojawia się w:
    Prace Instytutu Odlewnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure and microhardness of ball milled/hot pressed aluminium with Mg3N2 addition
    Mikrostruktura i mikrotwardość mielonego/prasowanego na gorąco aluminium z dodatkiem Mg3N2
    Autorzy:
    Gajewska, M.
    Dutkiewicz, J.
    Morgiel, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/354744.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminium matrix composites
    high energy ball milling
    magnesium nitride
    kompozyty o osnowie z aluminium
    wysokoenergetyczny młynek kulowy
    azotek magnezu
    Opis:
    The microstructure and microhardness of a ball milled and hot pressed aluminium powder with 10 vol.% of magnesium nitride (Mg3N2) were investigated. It was expected that the addition of a Mg3N2 as an nitrogen-bearing substrate would allow to obtain an in situ reaction leading to a formation of an aluminium nitride (AlN) strenghtening phase. The powders were milled in a high energy planetary ball mill for up to 40 h and then compacted in vacuum at 400ºC/600 MPa. The material was investigated by means of X-ray diffraction measurements (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and microhardness tests. The performed investigations showed that the composite preparation method provided a significant structure refinement of the material - the average matrix grain size of composite compact was about ˜140 nm. Energy Dispersive Spectrometry (EDS) analysis of Al/ Mg3N2 compact combined with X-ray diffraction (XRD) technique indicated a presence of Mg3N2 as well as Mg-Al-O phase, which were probably formed during hot pressing. Microhardness tests showed nearly 40% increase in the hardness of Al/ Mg3N2 composite over the non-reinforced aluminium compact.
    W niniejszej pracy przedstawiono wyniki obserwacji mikrostruktury i pomiarów mikrotwardości kompozytu o osnowie z aluminium z dodatkiem 10% objętościowych azotku magnezu wytworzonego drogą wysokoenergetycznego mielenia połączonego z prasowaniem na gorąco. Zakładano, że dodatek Mg3N2 jako substratu azotonosnego pozwoli na uzyskanie reakcji in situ prowadzącej do wytworzenia fazy wzmacniającej w postaci azotku aluminium. Proszki poddano mieleniu w wysokoenergetycznym młynku kulowym przez okres 40. godzin, a następnie sprasowano w próżni pod ciśnieniem 600 MPa w temperaturze 400ºC. Przeprowadzone obserwacje mikrostruktury materiału wykazały, że zastosowana metoda wytwarzania kompozytu pozwala na uzyskanie znacznego rozdrobnienia struktury materiału - średnia wielkość ziaren osnowy wynosiła ˜140 nm. Pomiary składu chemicznego technika EDS w połączeniu z analizą XRD wskazały na obecność zarówno azotku magnezu, jak również fazy Mg-Al-O w wyprasce kompozytowej. Pomiary mikrotwardości wykazały natomiast 40%-owy wzrost twardości kompozytu Al/ Mg3N2 w porównaniu z wypraska z niezbrojonego aluminium.
    Źródło:
    Archives of Metallurgy and Materials; 2013, 58, 2; 433-436
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-16 z 16

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