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Tytuł:
Affecting the Crystallization of Al-based alloys by Electromagnetic Field
Autorzy:
Bolibruchová, D.
Brůna, M.
Powiązania:
https://bibliotekanauki.pl/articles/379575.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aluminum alloy
silicon
inoculation
strontium
electromagnetic field
stop aluminium
silikon
stront
pole elektromagnetyczne
Opis:
This article deal with non-conventional methods to affect the crystallization of Al-alloys by the application of electromagnetic field. The application of electromagnetic field is not technically complicated, it does not require mechanical contact with the melt, and the scale of the crystallization influence is not dependent on the thickness of the casting. Two experimental materials were used: AlSi10MgMn and AlSi8Cu2Mn and two values of electromagnetic induction: B = 0.1 T a B = 0.2 T. The best results for alloy AlSi10MgMn were achieved by application of electromagnetic field with induction B = 0.2 T; during this experiment the best mechanical properties were achieved - the biggest increase of mechanical properties was recorded. The best results for alloy AlSi8Cu2Mn were achieved by combination of electromagnetic field with induction B = 0.1 T and modification by 0.05 wt. % Sr. In this case we don´t recommend to use electromagnetic field with induction B = 0.2 T; because of deposition of coarse grains and decreasing of mechanical properties.
Źródło:
Archives of Foundry Engineering; 2018, 18, 2; 157-162
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Antimony Influence on Shape of Eutectic Silicium in Al-Si Based Alloys
Autorzy:
Bolibruchová, D.
Brůna, M.
Powiązania:
https://bibliotekanauki.pl/articles/383239.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
antimony influence
alloy modification
aluminium alloy
wpływ antymonu
modyfikacja stopu
stop aluminium
Opis:
Liquid AI-Si alloys are usually given special treatments before they are cast to obtain finer or modified matrix and eutectic structures, leading to improved properties. For many years, sodium additions to hypoeutectic and eutectic AI-Si melts have been recognized as the most effective method of modifying the eutectic morphology, although most of the group IA or IIA elements have significant effects on the eutectic structure. Unfortunately, many of these approaches also have associated several founding difficulties, such as fading, forming dross in presence of certain alloying elements, reduced fluidity, etc. In recent years, antimony additions to AI-Si castings have attracted considerable attention as an alternative method of refining the eutectic structure. Such additions eliminate many of the difficulties listed above and provide permanent (i.e.,non-fading) refining ability. In this paper, the authors summarize work on antimony treatment of Al-Si based alloys.
Źródło:
Archives of Foundry Engineering; 2017, 17, 4; 31-34
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Strontium Inoculation on Hot Tearing in Aluminium Alloys
Autorzy:
Bolibruchová, D.
Bruna, M.
Pastirčák, R.
Major-Gabryś, K.
Powiązania:
https://bibliotekanauki.pl/articles/352703.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hot tearing
aluminium alloys
strontium
Opis:
Main aim of submitted work is evaluation and experimental verification of inoculation effect on Al alloys hot-tear sensitivity. Submitted work consists of two parts. The first part introduces the reader to the hot tearing in general and provides theoretical analysis of hot tearing phenomenon. The second part describes strontium effect on hot tearing susceptibility, and gives the results on hot tearing for various aluminium alloys. During the test, the effect of alloy chemical composition on hot tearing susceptibility was also analyzed. Two different Al-based alloys were examined. Conclusions deals with effect of strontium on hot tearing susceptibility and confirms that main objective was achieved.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 4; 1837-1842
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of the AlCr20 Addition on the Microstructure of Secondary AlSi7Mg0.3 Alloy
Autorzy:
Bolibruchova, D.
Richtarech, L.
Powiązania:
https://bibliotekanauki.pl/articles/383113.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
secondary AlSi7Mg0.3 alloy
iron based alloys
iron phases
thermal analysis
iron correctors
heat treatment
stop AlSi7Mg0,3
analiza termiczna
obróbka cieplna
żelazo
zanieczyszczenie stopu
Opis:
This paper deals with influence of chrome addition and heat treatment on segregation of iron based phases in the secondary alloy AlSi7Mg0.3 microstructure by chrome and heat treatment. Iron is the most common and harmful impurity in aluminum casting alloys and has long been associated with an increase of casting defects. In generally, iron is associated with the formation of Fe-rich intermetallic phases. It is impossible to remove iron from melt by standard operations, but it is possible to eliminate its negative influence by addition some other elements that affect the segregation of intermetallics in less harmful type or by heat treatment. Realization of experiments and results of analysis show new view on solubility of iron based phases during melt preparation with higher iron content and influence of chrome as iron corrector of iron based phases.
Źródło:
Archives of Foundry Engineering; 2014, 14, 2; 9-12
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Ti on Selected Properties of AlSi7Mg0.3Cu0.5 Alloy with Constant Addition of Zr
Autorzy:
Bolibruchová, D.
Kuriš, M.
Matejka, M.
Major-Gabryś, K.
Vicent, M.
Powiązania:
https://bibliotekanauki.pl/articles/2049632.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
AlSi7Mg0.3Cu0.5
investment casting
zirconium
titanium
increasing mechanical properties
Opis:
The article is focused on the synergic effect of constant content of Zr and higher content of Ti on mechanical properties Al-Si alloy. The Ti additions were in proportions of 0.1, 0.2 and 0.3 wt.% Ti. The casting process was carried out in ceramic molds, created for the investment casting technology. Half of the experimental samples were processed by precipitation curing T6. The measured results were compared with primary alloy AlSi7Mg0.3 and experimental alloy AlSi7Mg0.3Cu0.5Zr0.15. In variant with addition 0.1 wt. %, the tensile strength Rm increased by 1,5% but the elongation AM decreased to 40%. Variants with 0.2 and 0.3 wt. % addition of Ti achieved similar Rm but approximately 40% decrease in AM. However, it is interesting that yield strength Rp0.2 increased for all variants by approximately 14 to 20%. The results point out the possibility of developing a more sophisticated alloy for automotive industry.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 1; 65-72
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Elimination of Iron Based Particles in Al-Si Alloy
Autorzy:
Bolibruchová, D.
Richtárech, L.
Powiązania:
https://bibliotekanauki.pl/articles/379484.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
secondary AlSi7Mg0.3 alloy
iron phases
iron correctors
AlCr20
stop AlSi7Mg0,3
faza żelazowa
usuwanie żelaza
Opis:
This paper deals with influence on segregation of iron based phases on the secondary alloy AlSi7Mg0.3 microstructure by chrome. Iron is the most common and harmful impurity in aluminum casting alloys and has long been associated with an increase of casting defects. In generally, iron is associated with the formation of Fe-rich phases. It is impossible to remove iron from melt by standard operations, but it is possible to eliminate its negative influence by addition some other elements that affect the segregation of intermetallics in less harmful type. Realization of experiments and results of analysis show new view on solubility of iron based phases during melt preparation with higher iron content and influence of chrome as iron corrector of iron based phases. By experimental work were used three different amounts of AlCr20 master alloy a three different temperature of chill mold. Our experimental work confirmed that chrome can be used as an iron corrector in Al-Si alloy, due to the change of intermetallic phases and shortening their length.
Źródło:
Archives of Foundry Engineering; 2015, 15, 1; 9-12
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Elimination of Negative Effect of Fe in Secondary Alloys AlSi6Cu4 (En Ac 45 000, A 319) by Nickel
Rola Ni w eliminowaniu szkodliwego wpływu faz zawierających Fe w stopach wtórnych AlSi6Cu4 (En Ac 45 000, A 319)
Autorzy:
Bolibruchová, D.
Macko, J.
Brůna, M.
Powiązania:
https://bibliotekanauki.pl/articles/356915.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
iron based phases
thermal analysis
iron based phases correctors
nickel
fazy zawierające żelazo
analiza termiczna
usuwanie żelaza
nikiel
Opis:
Submitted article deals with influence of iron based phases segregation by nickel, which is in literature known as iron based phases corrector. Iron is one of the most common impurities that can be found in Al-Si alloys. It is impossible to remove iron from melt by standard operations, but it is possible to eliminate iron negative effects by addition of other elements, that enables segregation of iron in form of intermetallics with less harmful effect. For melt treatment was selected an exact alloy with requested iron content - master alloy AlNi20. Influence of nickel was evaluated quantitatively by chemical analysis (solubility), thermal analysis and microstructure evaluation. Experimental results analysis shows a new view on solubility of iron based phases during melt preparation and treatment with higher iron content and also nickel effect as iron corrector of iron based phases. It can be concluded that nickel did not influenced iron based phases (β-phases), it does not change their type into more favorable form. As an initial impulse for starting this work was insufficient theoretical knowledge of usage secondary alloys Al-Si-Cu with higher iron content and its appropriate elimination in process of castings production for automotive industry. Increased iron content in alloys causes segregation of iron phases in various shapes and types during solidification, which subsequently affects quality, soundness and lifetime of castings. Because of increased demands for casting quality, final mechanical properties and effort to reduce costs, it is necessary to look for compromises in casting production from secondary alloys with occurrence of various impurities.
Artykuł opisuje wpływ dodatku niklu| do stopów wtórnych Al-Si-Cu na segregację faz zawierających żelazo, które jest jednym z najpowszechniej występujących zanieczyszczeń w tych stopach. Powszechnie wiadomo, iż nie jest możliwe usunięcie żelaza z kąpieli metalowej, natomiast można ograniczać negatywny jego wpływ poprzez związanie żelaza w fazach między- metalicznych mniej szkodliwych niż fazy β Fe, np. w następstwie dodatku innych pierwiastków. W badaniach do obróbki kąpieli zastosowano zaprawę AlNi20 z dokładnie określoną zawartością żelaza. Oddziały wanie niklu na skład i morfologię faz żelazowych określano na drodze analizy chemicznej (badania rozpuszczalności), analizy termicznej i oceny struktury. Na podstawie wyników badań stwierdzono, iż w badanych stopach nikiel nie wywiera wpływu na zmianę składu fazy β Fe, nie zmienia również kształtu jej wydzieleń do postaci bardziej korzystnej z punktu widzenia wpływu na właściwości.
Źródło:
Archives of Metallurgy and Materials; 2014, 59, 2; 717-721
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Different Mn/Fe Ratio on Microstructure Alloy Based on Al-Si-Mg
Autorzy:
Bolibruchova, D.
Ivanova, A.
Powiązania:
https://bibliotekanauki.pl/articles/383021.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
AlSiMg alloys
manganese
intermetallic phases
microstructure
stopy AlSiMg
mangan
fazy międzymetaliczne
mikrostruktura
Opis:
This article deals with the effect of manganese that is the most applied element to eliminate the negative effect of iron in the investigated alloy AlSi7Mg0.3. In this time are several methods that are used for elimination harmful effect of iron. The most used method is elimination by applying the additive elements, so-called iron correctors. The influence of manganese on the morphology of excluded iron-based intermetallic phases was analysed at various iron contents (0.4; 0.8 and 1.2 wt. %). The effect of manganese was assessed in additions of 0.1; 0.2; 0.4 and 0.6 wt. % Mn. The morphology of iron intermetallic phases was assessed using electron microscopy (SEM) and EDX analysis. The increase of iron content in investigated alloys caused the formation of more intermetallic phases and this effect has been more significant with higher concentrations of manganese. The measurements carried out also showed that alloys with the same Mn/Fe ratio can manifest different structures and characteristics of excluded iron-based intermetallic phases, which might, at the same time, be related to different resulting mechanical properties.
Źródło:
Archives of Foundry Engineering; 2019, 3; 15-20
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Role of Mn in Aluminium Alloys with a Higher Iron Content
Autorzy:
Bolibruchová, D.
Podprocká, R.
Pastirčák, R.
Major-Gabryś, K.
Powiązania:
https://bibliotekanauki.pl/articles/355687.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
AlSi7Mg0.3
β-Al5FeSi phase
manganese
thermal analysis
Opis:
The paper deals with the influence of manganese in AlSi7Mg0.3 alloy with higher iron content. Main aim is to eliminate harmful effect of intermetallic – iron based phases. Manganese in an alloy having an iron content of about 0.7 wt. % was graded at levels from 0.3 to 1.4 wt. %. In the paper, the effect of manganese is evaluated with respect to the resulting mechanical properties, also after the heat treatment (T6). Morphology of the excluded intermetallic phases and the character of the crystallisation of the alloy was also evaluated. From the obtained results it can be concluded that the increasing level of manganese in the alloy leads to an increase in the temperature of the β-Al5FeSi phase formation and therefore its elimination. Reducing the amount of β-Al5FeSi phase in the structure results in an improvement of the mechanical properties (observed at levels of 0.3 to 0.8 wt. % Mn). The highest addition of Mn (1.4 wt.%) leads to a decrease in the temperature corresponding to the formation of eutectic silicon, which has a positive influence on the structure, but at the same time the negative sludge particles were also present.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 4; 1883-1888
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Utilisation of mould temperature change in eliminating the Al5FeSi phases in secondary AlSi7Mg0.3 alloy
Autorzy:
Bolibruchová, D.
Richtárech, L.
Dobosz, S. M.
Major-Gabryś, K.
Powiązania:
https://bibliotekanauki.pl/articles/355395.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
AlSi7Mg0,3 alloy
correctors of iron
recycled materials
iron based intermetallic phase
thermal analysis
Opis:
This article describes the impact of the metal mould temperature change in eliminating the adverse effect of iron in the AlSi7Mg0.3 alloy. The kind of phases based on iron to be formed in aluminium alloys is determined by the alloy chemical composition, the melt overheating temperature prior to casting, and the cooling rate during crystallisation. In the experiment, we used three various mould temperatures, and their impact on the possible change in the adverse Al5FeSi phase, excreted in a needle form to a more compact form of Chinese writing or skeleton units. The experimental part did not use melt overheat that would result in impairment of the melt, for example due to increased gassing of the melt, as well as in a greater load on the smelting unit, thus resulting in increased energy expenditure. We can conclude from the obtained results that the mould temperature change does not have an adequate effect in eliminating the adverse effect of iron in Al-Si-Mg alloys.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 1; 339-344
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vanadium Influence on Iron Based Intermetallic Phases in AlSi6Cu4 Alloy
Wpływ wanadu na fazy żelazowe w stopie AlSi6Cu4
Autorzy:
Bolibruchová, D.
Žihalová, M.
Powiązania:
https://bibliotekanauki.pl/articles/354052.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
AlSi6Cu4 alloy
iron correction
vanadium
iron based phases
stop AlSi6Cu4
redukcja żelaza
wanad
fazy żelazowe
Opis:
Negative effect of iron in Al-Si alloys mostly refers with iron based intermetallic phases, especially Al5FeSi phases. These phases are present in platelet-like forms, which sharp edges are considered as main cracks initiators and also as contributors of porosity formation. In recent times, addition of some elements, for example Mn, Co, Cr, Ni, V, is used to reduce influence of iron. Influence of vanadium in aluminium AlSi6Cu4 alloy with intentionally increased iron content is presented in this article. Vanadium amount has been graduated and chemical composition of alloy has been analysed by spectral analysis. Vanadium influence on microstructural changes was evaluated by microstructural analysis and some of intermetallic particles were reviewed by EDX analysis.
Negatywny wpływ żelaza w stopach Al-Si związany jest głównie z tworzeniem faz międzymetalicznych, szczególnie Al5FeSi. Fazy te występują w postaci płytkowej, których ostre krawędzie uważa się za główna przyczynę inicjacji pęknięć oraz zarodkowania porowatości. Obecnie w celu redukowania wpływu żelaza wprowadza się dodatek niektórych pierwiastków, np. Mn, Co, Cr, Ni, V. Wpracyprzedstawia się wpływ wanadu w stopie AlSi6Cu4 z celowo zwiększoną zawartością żelaza. W badaniach dodatek wanadu był stopniowany, a skład chemiczny określano w analizie spektralnej. Wpływ wanadu na zmiany strukturalne określono na drodze analizy mikrostruktury, natomiast cząstki faz międzymetalicznych opisano za pomocą analizy EDX.
Źródło:
Archives of Metallurgy and Materials; 2014, 59, 3; 1029-1032
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reoxidation Processes Prediction in Gating System by Numerical Simulation for Aluminium Alloys
Autorzy:
Bruna, M.
Bolibruchova, D.
Pastričák, R.
Powiązania:
https://bibliotekanauki.pl/articles/380662.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aluminium alloys
oxide film
numerical simulations
stopy aluminium
warstwa tlenkowa
symulacje numeryczne
Opis:
Pouring of liquid aluminium is typically accompanied by disturbance of the free surface. During these disturbances, the free surface oxide films can be entrained in the bulk of liquid, also pockets of air can be accidentally trapped in this oxide films. The resultant scattering of porosity in castings seems nearly always to originate from the pockets of entrained air in oxide films. Latest version of ProCast software allows to identify the amount of oxides formed at the free surface and where they are most likely to end-up in casts. During a filling calculation, ProCast can calculate different indicators which allow to better quantify the filling pattern. The fluid front tracking indicator “ Free surface time exposure” has the units [cm2s]. At each point of the free surface, the free surface area is multiplied by the time. This value is cumulated with the value of the previous timestep. In addition, this value is transported with the free surface and with the fluid flow. Experiments to validate this new functions were executed.
Źródło:
Archives of Foundry Engineering; 2017, 17, 3; 23-26
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Elasticity of cores manufactured in cold box technology
Autorzy:
Dobosz, S. M.
Grabarczyk, A.
Major-Gabryś, K.
Bolibruchova, D.
Powiązania:
https://bibliotekanauki.pl/articles/355352.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
moulding sands
cold-box technology
elasticity of moulding sands
Opis:
In the foundry industry, as in many other fields we seek to achieve the best quality with the least losses and the lowest cost. To meet these demands numerous plants increased automatization of their manufacturing processes. However, with changes in the production process it is necessary to change also the materials used. Not only casting alloys that are used in production, but also applied moulding and core sands are important. Proper selection and evaluation of the properties of used moulding mixtures is crucial in order to achieve a highly efficient production. In this article a new issue concerning the use of flexibility in foundry molding and core was mentioned. It explains the principles of measurement and interpretation of the obtained results for the cold-box moulding sands.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 1; 351-354
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Moulding Sand Type on Mechanical and Thermal Deformation
Autorzy:
Grabarczyk, A.
Major-Gabryś, K.
Dobosz, S. M.
Jakubski, J.
Bolibruchová, D.
Brůna, M.
Pastirčák, R.
Powiązania:
https://bibliotekanauki.pl/articles/353843.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
foundry engineering
moulding sand
core sand
organic binder
inorganic binder
mechanical deformation
thermal deformation
Opis:
Casting industry has been enriched with the processes of mechanization and automation in production. They offer both better working standards, faster and more accurate production, but also have begun to generate new opportunities for new foundry defects. This work discusses the disadvantages of processes that can occur, to a limited extend, in the technologies associated with mould assembly and during the initial stages of pouring. These defects will be described in detail in the further part of the paper and are mainly related to the quality of foundry cores, therefore the discussion of these issues will mainly concern core moulding sands. Four different types of moulding mixtures were used in the research, representing the most popular chemically bonded moulding sands used in foundry practise. The main focus of this article is the analysis of the influence of the binder type on mechanical and thermal deformation in moulding sands.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 1; 347-351
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Zirconium on the Solidification Path and Structural Properties of Commercial AlSi10MgCu Alloys
Autorzy:
Hajduch, P.
Djurdjevic, M. B.
Bolibruchová, D.
Simicevic, Z.
Powiązania:
https://bibliotekanauki.pl/articles/351378.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
zirconium
AlSi10MgCu alloy
grain size
SDAS
porosity
Opis:
Comprehensive understanding of the melt quality is of vital importance for foundry man. The effect of each particular element need to be properly analysed. Therefore, the aim of this paper was to analyse the impact of various content of zirconium on the solidification path and structural characteristics (SDAS, grain size, porosity) of as cast commercial AlSi10MgCu alloys. It has been found that addition of zirconium up to 0.24 wt.% reduce significantly the grains size (from 3.5 mm to 1.2 mm), SDAS (from 57.3 μm to 50.4 μm) and porosity (from 19% to 5%), leading to production of sound cast parts.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 2; 549-554
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
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