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Wyszukujesz frazę "Nowak, M.J." wg kryterium: Autor


Wyświetlanie 1-6 z 6
Tytuł:
Microstructure and properties of tin bronzes produced by the SPD method
Autorzy:
Sobota, J.
Rodak, K.
Nowak, M.
Powiązania:
https://bibliotekanauki.pl/articles/355126.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
tin bronzes
KOBO
microstructure
mechanical properties
corrosion
Opis:
In this article the structural and mechanical properties of grain refinement of Cu-Sn alloys with tin content of 10%, 15% and 20% using the KOBO method have been presented. The direct extrusion by KOBO (name from the combination of the first two letters of the names of its inventors – A. Korbel and W. Bochniak) method employs, during the course of the whole process, a phenomenon of permanent change of strain travel, realized by a periodical, two-sided, plastic metal torsion. Moreover the aim of this work was to study corrosion resistance. The microstructure investigations were performed using an optical microscope Olimpus GX71, a scanning electron microscope (SEM) and a scanning transmission electron microscope (STEM). The mechanical properties were determined with INSTRON 4505/5500 machine. Corrosion tests were performed using «Autolab» set – potentiostat/galvanostat from EcoChemie B.V. with GPES software ver. 4.9. The obtained results showed possibility of KOBO deformation of Cu-Sn casting alloys. KOBO processing contributed to the refinement of grains and improved mechanical properties of the alloys. The addition of tin significantly improved the hardness. Meanwhile, with the increase of tin content the tensile strength and yield strength of alloys decrease gradually. Ductility is controlled by eutectoid composition and especially δ phase, because they initiate nucleation of void at the particle/matrix interface. No significant differences in the corrosion resistance between cast and KOBO processed materials were found.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 1; 95-102
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of Impact of Nickel Additions on Tin Bronzes
Autorzy:
Kozana, J.
Garbacz-Klempka, A.
Piękoś, M.
Czekaj, J.
Perek-Nowak, M.
Powiązania:
https://bibliotekanauki.pl/articles/382525.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wear resistant alloys
tin bronze
microstructure
alloy additives
Cu–Sn–Ni alloy
stopy odporne na zużycie
brąz cynowy
mikrostruktura
dodatki stopowe
stop Cu-Sn-Ni
Opis:
High prices of tin and its limited resources, as well as several valuable properties characterising Cu-Sn alloys, cause searching for materials of similar or better properties at lower production costs. The influence of various nickel additions to CuSn10 casting bronze and to CuSn8 bronze of a decreased tin content was tested. Investigations comprised melting processes and casting of tin bronzes containing various nickel additions (up to 5%). The applied variable conditions of solidification and cooling of castings (metal and ceramic moulds) allowed to assess these alloys sensitivity in forming macro and microstructures. In order to determine the direction of changes in the analysed Cu-Sn-Ni alloys, the metallographic and strength tests were performed. In addition, the solidification character was analysed on the basis of the thermal analysis tests. The obtained results indicated the influence of nickel in the solidification and cooling ways of the analysed alloys (significantly increased temperatures of the solidification beginning along with increased nickel fractions in Cu-Sn alloys) as well as in the microstructure pattern (clearly visible grain size changes). The hardness and tensile strength values were also changed. It was found, that decreasing of the tin content in the analysed bronzes to which approximately 3% of nickel was added, was possible, while maintaining the same ultimate tensile strength (UTS) and hardness (HB) and improved plasticity (A5).
Źródło:
Archives of Foundry Engineering; 2018, 18, 1; 53-60
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of SiC and GR Reinforcement Particles on the Structure and Functional Properties of Composite Casting E43 MMC Reinforced with SiC Particles
Autorzy:
Boczkal, S.
Dolata, A. J.
Nowak, M.
Powiązania:
https://bibliotekanauki.pl/articles/351537.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aluminium hybrid composite
microstructure
wear tests
Opis:
The aim of the study was to describe the structure of composites based on the AlSi7Mg2Sr0.03 alloy matrix reinforced with SiC particles added in an amount of 10% and with a mixture of SiC and GR particles added in a total amount of 20%. Studies of the composite structure, were carried out by scanning electron microscopy (SEM). Based on the results of chemical analysis in microregions, an increased content of elements such as Mg, O and Si and of the precipitates was observed at the interface. In many places in the examined sample, GR particles formed partly disintegrated conglomerates with well developed boundaries. The effect of the content of particles of the reinforcing phase on the functional properties of the composite was investigated during studies of abrasion. The lowest mass loss of 5,33mg was obtained for the AlSi7Mg2Sr0.03 alloy reinforced with 10% SiC particles.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 1; 399-404
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
TEM investigation of phases formed during aluminium wetting of MgO at [100], [110] and [111] orientations
Analiza fazowa metodą TEM produktów reakcji powstałych w czasie zwilżania przez aluminium podłoży MgO o orientacji [100], [100] i [111]
Autorzy:
Morgiel, J.
Sobczak, N.
Pomorska, M.
Nowak, R.
Wojewoda-Budka, J.
Powiązania:
https://bibliotekanauki.pl/articles/354574.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Al/MgO reaction
α-Al2O3
MgAl2O4
microstructure
TEM
EDS
reakcja Al/MgO
Al2O3
Opis:
The interaction of liquid aluminium (5N) with single crystal MgO substrates of [100], [110] and [111] orientations (surface roughness <1 nm) were studied using sessile drop wettability test performed at 1000ºC for 1 hour in vacuum (5 x 10-6 mbar). The observations performed using scanning electron microscopy (SEM) showed that the interaction of liquid metal with MgO crystals in all cases resulted in the formation of reaction products region (RPR) of thickness varying from 40 up to 80 microns in depth. In each case the RPR consisted mainly of coarse dendrite-like crystallites of few microns thick surrounded by net of much thinner channels. Occasionally away from the RPR centre the areas built of much finner but also dendrite- or filament-like crystallites were noted. The thin foils for transmission electron microscopy (TEM) investigations were cut using focused ion beam system (FIB) both from drop/RPR as well as RPR/MgO interfacial regions. The electron diffractions proved that the dominating coarse dendrite-like crystallites are of the same α-Al2O3 type throughout the whole RPR for all substrates orientations. Similarly, the colonies of finer crystallites always showed diffraction patterns characteristic for MgAl2O4 spinel. Therefore, the performed investigation indicated, that both the reaction layer depth and the reaction path represented by the sequence and type of phases present in Al/MgO RPR remain roughly similar for all examined orientations, i.e. that the substrate orientation control neither reaction kinetics, nor affects final phase composition of RPR.
Oddziaływanie ciekłego aluminium (5N) z mono-krystalicznymi podłożami o orientacji [100], [110] i [111] (chropowatość <1nm) badano metodą kropli leżącej w 1000ºC przez 1 godzine w dynamicznej próżni rzędu 10-4 Pa. Obserwacje z wykorzystaniem mikroskopii skaningowej (SEM) wykazały, że oddziaływanie ciekłego metalu z kryształami MgO we wszystkich przypadkach prowadziło do wytworzenia strefy produktów reakcji (tzw. reaction produkt region - RPR) o grubości od 40 do 80 mum. W strefach tych wystepowały wydzielenia o kształcie dendrytycznym rozdzielone waskimi kanałami aluminium. Na krawędziach strefy reakcji stwierdzono obecność kolejnej strefy o grubości kilku- kilkunastu-mikrometrów wypełnionej materiałem o jeszcze drobniejszej włóknistej strukturze. Obserwacje mikrostruktury prowadzono z wykorzystaniem mikroskopii transmisyjnej na cienkich foliach wycietych technika FIB zarówno z granic obu stref, oraz z granicy RPR/MgO. Obserwacje te, w powiązaniu z analizą dyfrakcji elektronowych wykazały, że dla MgO wszystkich orientacji dominujace w RPR duże wydzielenia o kształcie dendrytycznym odpowiadaja fazie α- Al2O3. Równoczesnie, analiza dyfrakcji drobniejszych krystalitów zlokalizowanych w pod-strefie ulokowanej na granicach poza centrum RPR wykazała, że mają one budowe charakterystyczna dla spinelu MgAl2O4. Przeprowadzone badania wykazały, że zarówno grubość RPR, a w tym jej pod-strefy drobniejszych wydzieleń na jej obrzeżach, jak też drogą reakcji reprezentowana przez sekwencje i typ wydzielających się faz w czasie oddziaływania ciekłego aluminium jest identyczna dla wszystkich analizowanych monokrystalicznych podłoży MgO, tj. orientacja tych podłoży nie ma wpływu ani na skład fazowy produktów reakcji ani też na kinetykę tego procesu.
Źródło:
Archives of Metallurgy and Materials; 2013, 58, 2; 497-500
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Modification in Centrifugal Casting on Microstructure and Mechanical Properties of Silicon Bronzes
Autorzy:
Garbacz-Klempka, A.
Kozana, J.
Piękoś, M.
Papaj, P.
Perek-Nowak, M.
Powiązania:
https://bibliotekanauki.pl/articles/379593.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innovative foundry technologies
innovative foundry materials
CuSi alloys
centrifugal casting
microstructure
mechanical properties
innowacyjne technologie odlewnicze
innowacyjne materiały odlewnicze
stop Cu-Si
odlewanie odśrodkowe
mikrostruktura
właściwości mechaniczne
Opis:
Silicon bronzes are characterised by good mechanical properties and by high corrosion and mechanical wear resistance. The process of sleeve casting by means of the centrifugal casting with the horizontal axis of the mould rotation was analysed. The assessment of the influence of modification and centrifugal casting parameters on the microstructure and mechanical properties of alloys was carried out in the hereby work. Zirconium was applied as a modifier. Speed of rotation of the mould was the variable parameter of the centrifugal casting. The investigation results were summarised on the basis of the microstructure analysis and mechanical properties determination: UTS, proof stress, A10 and BHN. The experiment aimed at finding the information in which way the modification together with changing the pouring parameters influence the mechanical properties of the CuSi3Zn3FeMn alloy.
Źródło:
Archives of Foundry Engineering; 2018, 18, 3; 11-18
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research of Aluminium Influence on Tin Bronzes
Autorzy:
Rzadkosz, S.
Garbacz-Klempka, A.
Kozana, J.
Piękoś, M.
Czekaj, E.
Perek-Nowak, M.
Powiązania:
https://bibliotekanauki.pl/articles/382669.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
durable alloys
tin bronzes
mechanical properties
metallography
microstructure
trwałość stopów
brązy cynowe
właściwości mechaniczne
metalografia
mikrostruktury
Opis:
During the research a group of copper and tin alloys was investigated. The influence of variable additions of aluminium within the range of 0.3 – 1.4 wt % was analysed on tin bronze CuSn10 with the aim of obtaining durable bronzes, from outside the normalized copper alloy groups. Melts were conducted in order to obtain alloy samples for testing the chosen properties. Metallographic and SEM-EDS tests were carried out to determine the microstructure changes caused by introducing Al addition to CuSn10 alloy. Also, chosen mechanical properties were tested for the alloys investigated. The results showed considerable changes in the microstructure as well as significant hardening of the Cu-Sn alloys as the result of aluminium addition. The thermal and dilatometric analysis confirmed the presence of phase changes, also their parameters were assessed depending on the share of aluminium addition in the CuSn10. The aluminium additive applied within the range of 0.3-1.4 wt% to CuSn10 bronze clearly impacted the microstructure and the strength properties analysed, causing the increase in strength and hardness with simultaneous insignificant decrease of elongation of the CuSn10Al alloys.
Źródło:
Archives of Foundry Engineering; 2015, 15, 1 spec.; 93-98
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-6 z 6

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