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Wyszukujesz frazę "Al/Al" wg kryterium: Temat


Tytuł:
Le traduzioni polacche delle novelle di Grazia Deledda (1906–1939)
Polish Translations of Grazia Deledda’s Short Stories (1906–1939)
Autorzy:
Łukaszewicz, Justyna
Powiązania:
https://bibliotekanauki.pl/articles/34670928.pdf
Data publikacji:
2024-06-30
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
Grazia Deledda
short stories
literary translation
translation from Italian into Polish
literary image
novelle
traduzione letteraria
traduzione dall’italiano al polacco
immagine letteraria
Opis:
The paper is devoted to the editorial and translation history of Grazia Deledda’s short stories in Poland before the Second World War, a topic barely touched upon in scholarship so far. I establish which original collections were most successful and examine the circumstances of the publication of the translations, taking into consideration the translators and the profiles of the journals that published the eleven translated short stories. My study of the translations themselves focuses on the translators’ approach to Italian and Sardinian nature and culture and identifies elements that were eliminated, reproduced without explanation, or explained by means of notes. My findings are that only one translation is equipped with footnotes, that the local colour is largely rendered in translation, and that major losses in translation include some elements of descriptions of landscapes and characters.
Il saggio è dedicato alla fortuna editoriale e traduttiva della novellistica deleddiana in Polonia prima della Seconda guerra mondiale, un argomento finora poco studiato. Si stabilisce quali siano state le raccolte originali più fortunate; si esaminano altresì le circostanze della pubblicazione delle traduzioni, prendendo in considerazione le figure dei traduttori e il profilo delle riviste che hanno accolto le undici novelle tradotte. Lo studio delle traduzioni si focalizza sull’approccio dei traduttori nei confronti della natura e della cultura italiana e sarda per approfondire la questione delle scelte traduttive. Ci si chiede in particolare quali elementi sono stati eliminati, quali invece sono stati riprodotti senza spiegazioni o spiegati con uso di note. L’indagine qui condotta ha portato alla conclusione che solo una fra le traduzioni esaminate contiene delle note à piè di pagina, che il colorito locale è stato in gran parte rispettato e che le perdite interessano maggiormente gli elementi descrittivi relativi a paesaggi e personaggi.
Źródło:
Italica Wratislaviensia; 2024, 15.1; 105-126
2084-4514
Pojawia się w:
Italica Wratislaviensia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Powłoki ceramiczne Al2O3 otrzymywane w technologii natryskiwania cieplnego plazmowego APS
Ceramic coatings Al2O3 obtained using APS plasma thermal spraying technology
Autorzy:
Iwaniak, Aleksander
Powiązania:
https://bibliotekanauki.pl/articles/36141084.pdf
Data publikacji:
2024
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Ceramiki i Materiałów Budowlanych
Tematy:
natryskiwanie cieplne plazmowe
APS
powłoka Al2O3
zużycie tribologiczne
mikrostruktura powłok
Atmosferic Plasma Spraying
Al2O3 coating
tribological wear
microstructure of coatings
Opis:
W pracy wytworzono ceramiczne powłoki z proszku tlenku aluminium i proszku tlenku aluminium z dodatkiem 5% proszku tlenku tytanu z wykorzystaniem technologii natryskiwania plazmowego ASP. Stwierdzono, że dodatek 5% proszku tlenku tytanu TiO2 do proszku tlenku aluminium Al2O3 powoduje spadek porowatości natryskiwanej powłoki z 5,9 % do 3,5%. Ponadto tlenek tytanu dodany do tlenku aluminium zmniejsza twardość natryskiwanej powłoki z 988 HV0,3 do 935 HV0,3. Wykonane badania zużycia tribologicznego wytworzonych powłok z skojarzeniu z pinem z węglika krzemu SiC wykazały, że dodatek tlenku tytanu powoduje zmniejszenie współczynnika tarcia badanego skojarzenia w warunkach tarcia suchego - współczynnik µ zmalał z wartości µ=0,37 do µ=0,26.
In this work, ceramic coatings were produced from aluminum oxide powder and aluminum oxide powder with the addition of 5% titanium oxide powder using ASP plasma spraying technology. It was found that the addition of 5% titanium oxide TiO2 powder to aluminum oxide powder Al2O3 causes a decrease in the porosity of the sprayed coating from 5.9% to 3.5%. Moreover, titanium oxide added to aluminum oxide reduces the hardness of the sprayed coating from 988 HV0.3 to 935 HV0.3. Tribological wear tests of coatings produced in combination with a SiC silicon carbide pin showed that the addition of titanium oxide causes a reduction in the friction coefficient of the tested combination under dry friction conditions - the μ coefficient decreased from μ=0.37 to μ=0.26.
Źródło:
Szkło i Ceramika; 2024, 75, 1; 1-6
0039-8144
Pojawia się w:
Szkło i Ceramika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Teoria kalifatu Al-Mawardiego i jej związek ze współczesnym islamizmem
Al-Mawardi’s theory of the caliphate and its connection to the contemporary Islamism
Autorzy:
Zasuń, Anna
Powiązania:
https://bibliotekanauki.pl/articles/40217771.pdf
Data publikacji:
2024-06-30
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
islam
państwo
islamizm
Al-Mawardi
kalifat
społeczeństwo muzułmańskie
szaria
Islam
state
Islamism
Muslim society
caliphate
Sharia
Opis:
The article presents the concept of the caliphate of theologian and jurist at the turn of the 10th and 11th centuries, Al-Mawardi, based on his work Al-Ahkam as-sultaniyya and the socio-political nature of the period of the Abbasid dynasty, which was the context of its creation. Based on a detailed analysis of Al-Mawardi’s views on political power in Islam (traditional caliphate), the author’s aim was to show the connection of this theory with selected elements of the contemporary ideology of Islamism, and thus attempt to answer the question about the continuity of Muslim political thought. Considering the changes of the caliphate in times of Al-Mawardi, but also in later periods, including the ones that occurred in the Islamic world after the fall of the Ottoman Empire, the author argues that views on power in Islam were conditioned by a complex socio-political context, which was influenced by factors internal and external to the world of Islam. Discussed theory of Al-Mawardi’s caliphate constitutes the basis for the search for analogies in the political doctrine of contemporary Islamic reformers and the ideology of Islamism, which in turn allows Al-Mawardi’s views to be considered appropriate also for the contemporary concept of power in Islam.
W artykule przedstawiono koncepcję kalifatu teologa i prawnika przełomu X i XI wieku Al-Mawardiego w oparciu o jego dzieło Al-Ahkam as-sultanijja oraz społecznopolityczny charakter okresu panowania dynastii Abbasydów, który stanowił kontekst jej powstania. Na podstawie szczegółowej analizy poglądów Al-Mawardiego na władzę polityczną w islamie (tradycyjny kalifat) celem autora było ukazanie związku tej teorii z wybranymi elementami współczesnej ideologii islamizmu, a tym samym próba odpowiedzi na pytanie o ciągłość muzułmańskiej myśli politycznej. Uwzględniając przemiany kalifatu, w szczególności w czasach Al-Mawardiego, ale też w okresach późniejszych, w tym zmiany jakie nastąpiły w świecie islamu po upadku imperium osmańskiego, autor dowodzi, że poglądy na temat władzy w islamie były uwarunkowane złożonym kontekstem społeczno-politycznym, na który wpływ miały czynniki wewnętrzne, ale i zewnętrzne względem świata islamu. Omawiana teoria kalifatu Al-Mawardiego stanowi podstawę do poszukiwań analogicznych elementów w doktrynie politycznej współczesnych reformatorów islamskich i ideologii islamizmu, co z kolei pozwala uznać poglądy Al-Mawardiego za odpowiednie także dla współczesnej koncepcji władzy w islamie.
Źródło:
Nowa Polityka Wschodnia; 2024, 2(41); 189-211
2084-3291
Pojawia się w:
Nowa Polityka Wschodnia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Comparative Study on Ex-Situ & In-Situ Formed Metal Matrix Composites
Autorzy:
Gobalakrishnan, B.
Rajaravi, C.
Udhayakumar, Gobikrishnan
Lakshminarayanan, P. R.
Powiązania:
https://bibliotekanauki.pl/articles/2203734.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
MMCs
Al-SiC
Al-TiB2
extrusion
heat treatment
mechanical properties
microstructure
Opis:
An attempt has been made to synthesize the aluminium based ex-situ (Al-SiC) and in-situ (Al-TiB2) formed metal matrix composites with varying weight percentage of reinforcement contents such as 4wt.%, 6wt.% and 8wt.%. Synthesized composites were subjected to a cold extrusion process followed by heat treatment according to the ASTM B 918-01 standards. The mechanical properties of in-situ composites were evaluated as per the ASTM guidelines and compared with ex-situ formed composites and base metal properties. Superior properties were noticed in the in-situ formed composites and the mechanical properties such as yield strength, Ultimate tensile strength (UTS) and Hardness for both ex-situ and in-situ composites were found to increase with increasing the reinforcement addition. Cold extruded Al-8 wt.% SiC composite properties such as hardness, yield strength and UTS are 87 RB, 152 MPa, 216 MPa respectively. Whereas, for Al-8 wt.% TiB2 composite, the corresponding properties are 94 RB, 192 MPa, 293 MPa. The morphology of the composites is analysed by Optical and Scanning Electron Microscopic (SEM) whereas presence of reinforcement particles such SiC and TiB2 along with intermetallic phases Mg2Si and Al5FeSi are confirmed by EDX, XRD and Element Mapping analyses.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 171--185
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new environmentally friendly chemical mechanical polishing method applied for surface finishing Ti-6Al-4V alloy
Autorzy:
Quang, Nguyen Minh
Quan, Nguyen Ngoc
Mai, Nguyen Trong
Thanh, Le Thi Phuong
Tung, Nguyen Tien
Tan, Tran Ngoc
Hai, Ha Thanh
Trinh, Nguyen Duy
Powiązania:
https://bibliotekanauki.pl/articles/28407325.pdf
Data publikacji:
2023
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
chemical-mechanical polishing
hydrogen peroxide
TI-6AL-4V
silica
malic acid
Opis:
A new eco-friendly slurry has been developed for the chemical mechanical polishing process with a solution of malic acid, deionized water, and an oxidizing agent hydrogen peroxide (H2O2). The surface quality of Ti-6Al-4V workpieces with the proposed chemical mechanical polishing slurry with optimal parameters include oxidizers (H2O2), colloidal (SiO2) slurry, and deionized water by weight 8%, 45%, and 47% respectively, the pH concentration is adjusted 4 through the malic acid content present in the slurry. Experimental results obtained with the proposed chemical mechanical polishing method show a more improved surface quality than previous studies when applying for polishing Ti-6Al-4V alloy. The developed chemical mechanical polishing method's polishing results under optimal conditions obtain an ultra-fine surface quality with Ra = 0.696 nm over a measuring area of 53×70 μm2. X-ray photoelectron (XPS) and electrochemical measurements were used to study the chemical reaction mechanisms in the proposed chemical mechanical polishing process. The chemical mechanical polishing processes for the surface of the Ti-6Al-4V alloy workpiece with the H2O2 oxidizing agent showed high suitability with the reactants formed on the surface such as Ti, V, and Al oxide. With the proposed oxidant and the established chemical mechanical polishing slurry, the feasibility and surface quality of the super smooth Ti-6Al-4V workpiece formed after polishing were demonstrated. The established chemical mechanical polishing method shows high applicability in environmental protection and Ti-6Al-4V alloy ultra-precision machining industries.
Źródło:
Journal of Machine Engineering; 2023, 23, 4; 64--76
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Abrasive wear resistance of Fe3Al and Satellite 6 coatings for the protection of valve seats surfaces
Autorzy:
Szczucka-Lasota, Bożena
Tarasiuk, Wojciech
Cybulko, Piotr
Węgrzyn, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/27311342.pdf
Data publikacji:
2023
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
valve seat
abrasive wear
intermetal Fe3Al
Stellite 6
gniazdo zaworu
zużycie ścierne
Opis:
The development of a technology that increases the service life of valve seats in CNG/LNG-powered vehicles requires the appropriate selection of material and the technology of its application. Commercially used valve seat materials show accelerated wear under operating conditions, especially in natural gas vehicle engines. The authors developed a new material concept and a new technological concept for the protection of the valve seat in CNG/LNG-powered vehicles. This article aims to present the first stage of tribological research. Two materials were used in the research: Stellite 6 alloy and Fe3Al intermetal. A commonly used material for valve seats of combustion engines is Stellite 6. The Fe3Al is the new proposed material coating for the protection of the valve seats of internal combustion engines. This article compares the abrasive wear resistance of these materials. The abrasion tests were performed on a T-11 pin-on-disc tester, and the counter-sample was steel S235JR. The test conditions were similar to those prevailing during the operation of the valves in the head of the internal combustion engine, without the influence of temperature. The obtained results indicate that the Fe3Al intermetal is characterized by a lower coefficient of friction and lower wear intensity than Stellite 6. The results confirm that the Fe3Al phase is a prospective material to be used as a protective material on the valve seat of vehicles.
Źródło:
Zeszyty Naukowe. Transport / Politechnika Śląska; 2023, 118; 219--228
0209-3324
2450-1549
Pojawia się w:
Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badanie struktury i właściwości kompozytu ceramicznego na bazie Al2O3
Investigation of the Structure and Properties of a Ceramic Composite Based on Al2O3
Autorzy:
Matyja, Karolina
Bałaga, Zbigniew
Lipiński, Tomasz
Nowacki, Krzysztof
Powiązania:
https://bibliotekanauki.pl/chapters/28328206.pdf
Data publikacji:
2023-12-14
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
chropowatość powierzchni
kompozyt Al2O3/ZrO2
spiekanie
twardość Vickersa
Al2O3/ZrO2 composite
sintering
surface roughness
Vickers hardness
Opis:
W rozdziale przedstawiono wyniki badań kompozytu na bazie Al2O3 z dodatkiem ZrO2. Próbki do badań wytworzono metodą spiekania konwencjonalnego. Zawartość fazy cyrkonowej w kompozycie zmieniała się od 5 do 20% wagowych. Na otrzymanych próbkach wyznaczono gęstość kompozytów, twardość metodą Vickersa, chropowatość powierzchni oraz przeprowadzono obserwacje struktury. Przeprowadzone badania wykazały, że na każdą z badanych właściwości wpływ miał zmieniający się udział fazy cyrkonowej.
The chapter presents the results of research on a composite based on Al2O3 with the addition of ZrO2. Test samples were produced by conventional sin- tering. The content of the zirconium phase in the composite varied from 5 to 20% by weight. Composite density, Vickers hardness, surface roughness and structure observations were determined on the obtained samples. The tests carried out showed that each of the tested properties was influenced by the changing share of the zirconium phase.
Źródło:
Potencjał innowacyjny w inżynierii materiałowej i zarządzaniu produkcją; 56-63
9788371939457
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of assembly holes quality after drilling and helical milling of the Al/CFRP stacks
Porównanie jakości otworów montażowych po wierceniu i frezowaniu spiralnym konstrukcji przekładkowej typu Al/CFRP
Autorzy:
Doluk, Elżbieta
Powiązania:
https://bibliotekanauki.pl/articles/31232948.pdf
Data publikacji:
2023
Wydawca:
Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:
Al/CFRP stacks
drilling
helical milling
hole quality
konstrukcja przekładkowa Al/CFRP
wiercenie
frezowania spiralne
jakość otworu
Opis:
Hybrid sandwich structures composed of aluminium alloys and CFRP (Carbon Fibre Reinforced Polymer) are now frequently used in the aerospace industry. One of the factors inhibiting their application is the difficult processing resulting from the anisotropic nature of this type of construction. These materials are often joined by screws or rivets requiring mounting holes. One of the main problems is ensuring the quality of the holes after machining. The aim of this study is to assess the hole quality (dimensional and shape accuracy) and the occurrence of delamination after machining of a Al 2024/CFRP sandwich structure. In this experiment drilling and helical milling results were compared. A traditional HSS twist drill and a PCD milling cuter with a straight cut were used. The machining was carried out with a variable cutting speed. The tests were performed for two strategy of the machining - Al/CFRP (Al 2024 T3 - Carbon Fibre Reinforced Polymer) and CFRP/Al (Carbon Fibre Reinforced Polymer - Al 2024 T3).
Hybrydowe konstrukcje przekładkowe składające się ze stopów aluminium i kompozytów epoksydowo-węglowych (CFRP) są obecnie często stosowane w przemyśle lotniczym. Jednym z czynników hamujących ich zastosowanie jest trudna obróbka wynikająca z dużej anizotropowości tego typu materiałów. Konstrukcje te są często łączone za pomocą połączeń śrubowych lub nitowych wymagających otworów montażowych. Jednym z głównych problemów jest zapewnienie jakości otworów po obróbce. Celem artykułu jest ocena jakości otworów (dokładności wymiarowo-kształtowej) oraz występowania delaminacji po obróbce konstrukcji przekładkowej Al 2024/CFRP. W eksperymencie porównano wyniki wiercenia i frezowania spiralnego. Zastosowano tradycyjne wiertło kręte wykonane ze stali szybkotnącej oraz frez węglikowy o prostych zębach pokrytych powłoką diamentową (PKD). Obróbka została przeprowadzona ze zmienną prędkością skrawania. Testy przeprowadzono dla dwóch strategii obróbki - Al/CFRP (stop aluminium/kompozyt epoksydowo-węglowy) i CFRP/Al (kompozyt epoksydowo-węglowy/stop aluminium).
Źródło:
Technologia i Automatyzacja Montażu; 2023, 4; 3-12
2450-8217
Pojawia się w:
Technologia i Automatyzacja Montażu
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dual Application of Al-Kheriat of Removal of Arsenic from Aqueous Solution and Acting as Rodenticide
Autorzy:
Al-Jendeel, Haider Abdulkareem
Rasheed, Hala Abdulkareem
Ahmedzeki, Nada Sadoon
Alhassani, Maha Hadi
Powiązania:
https://bibliotekanauki.pl/articles/24201659.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
arsenic
biosorbent
rodenticide
green process
Al-Kheriat
liver enzyme
Opis:
Arsenic is a prevalent and pervasive environmental contaminant with varied amounts in drinking water. Arsenic exposure causes cancer, cardiovascular, liver, nerve, and ophthalmic diseases. The current study aimed to find the best conditions for eliminating arsenic from simulated wastewater and their effect on biomarkers of hepatic in mice. Adsorption tests including pH, contact duration, Al-kheriat dosage, and arsenic concentrations were evaluated. Seventy-two healthy albino mice (male) were accidentally allocated into nine groups (n = 8), the first group was considered as healthy control, the second group (AL-Kheriat), and other groups received AL-Kheriat and arsenic 25, 50, 75, 100, 125, 150 and 175 mg/kg, respectively. Next 10 days, the following were examined: LD50 level, ALP (alkaline phosphatase), ALT (alanine aminotransferase), and AST (aspartate aminotransferase), besides the histological condition of the liver. The results showed that the best time for arsenic removal was 4 hours, pH 8, Alkheriat dose 1 gram, and 50 ppm of pollutants. The level of alkaline phosphatase ALP, alanine transaminase ALT, and aspartate transaminase AST was increased to 150.96 (U/L), 143.1(U/L), and 32.8(U/L), respectively, in Al-Khriet and arsenic exposed population than the healthy control group, When the appropriate dose of Al-Khriet and arsenic mixture is used, it can aid in the selection of a safe way of disposing of the adsorbed residue. Additionally, it can serve as a low-cost rodent pesticide, increasing the commercial viability of this removal strategy.
Źródło:
Journal of Ecological Engineering; 2023, 24, 4; 16--26
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Atmospheric-Pressure Gas-Plasma Treatment on Surface Properties of Hot-Dip Zn-Mg-Al Alloy-Coated Steel
Autorzy:
Jeong, Chang-U
Kim, Jae-Hyeon
Park, Je-Shin
Kim, Min-Su
Kim, Sung-Jin
Oh, Min-Suk
Powiązania:
https://bibliotekanauki.pl/articles/2203736.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
plasma treatment
Zn-Mg-Al-galvanized steel
surface energy
process gas
Opis:
The effect of plasma-radical change on the surface properties of Zn-Mg-Al ternary-alloy-coated steel sheets during atmospheric-pressure (AP) plasma treatment using different process gases: O2, N2, and compressed air was investigated. The plasma-induced radicals promoted the formation of chemical particles on the surface of the Zn-Mg-Al coating, thereby increasing the surface roughness. The surface energy was calculated using the Owen-Wendt geometric equation. Contact angle measurements indicated that the surface free energy of the alloy sheets increased upon AP plasma treatment. The surface properties of the Zn-Mg-Al coating changed more significantly in the order air > O2 > N2 gas, indicating that the plasma radicals facilitated the carbonization and hydroxylation of the Mg and Al components during the AP plasma treatment.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 187--190
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Ball on SPS Characteristics of Ti-Al-Nd Powders Prepared by High Energy Ball Milling
Autorzy:
Lee, Hyunseung
Rhee, Hoseong
Lee, Sangsoo
Chang, Si Young
Powiązania:
https://bibliotekanauki.pl/articles/2203712.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
high energy ball milling
STS
zirconia ball
SPS
Ti-Al-Nd alloy
microhardness
Opis:
The effects of different types of balls on spark plasma sintering (SPS) characteristics of high energy ball milled Ti-48wt% Al-4wt% Nd powders were investigated. After ball milling with STS balls and zirconia balls at 800 rpm for 3 h in argon atmosphere, both powders showed shape factors of about 0.8, but their average powder sizes differed respectively at approximately 11 µm and 5 µm. From XRD results, only the peaks of pure Ti, Al and Nd were detected in both powders. The obtained Ti-Al-Nd powders were consolidated by SPS technique at 1373 K for 15 min under a pressure of 50 MPa in vacuum, resulting in high density over 99%. EDS and XRD analyses indicated the formation of binary phases such as TiAl3, TiAl, Ti3Al5, and NdAl3 after SPS in both cases of STS and zirconia balls, while the ternary Ti-Al-Nd phase was detected only in the case of zirconia balls. The size of second phases was slightly smaller in the case of zirconia balls. The microhardness of the sample was 790 Hv with zirconia balls and 540 Hv with STS balls.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 81--84
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Cooling Rate on the Microstructure and Mechanical Properties of Al-33 wt.% Cu Alloy
Autorzy:
Lee, Yeon-Joo
Kwon, Do-Hun
Cha, Eun-Ji
Song, Yong-Wook
Choi, Hyun Joo
Kim, Hwi-Jun
Powiązania:
https://bibliotekanauki.pl/articles/2203708.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
laser melting
cooling rate
lamellar spacing
hardness
Al-33wt.%Cu alloy
Opis:
Directed energy deposition (DED) is an additive manufacturing process wherein an energy source is focused on a substrate on which a feedstock material is simultaneously delivered, thereby forming a small melt pool. Melting, solidification, and subsequent cooling occur at high rates with considerable thermal gradients compared with traditional metallurgical processes. Hence, it is important to examine the effects of cooling rates on the microstructures and properties of the additive manufactured materials. In this study, after performing DED with various energy densities, we investigated the changes in the microstructures and Vickers hardness of cast Al-33 wt.% Cu alloy, which is widely used to estimate the cooling rate during processing by measuring the lamellar spacing of the microstructure after solidification. The effects of the energy density on the cooling rate and resultant mechanical properties are discussed, which suggests a simple way to estimate the cooling rate indirectly. This study corresponds to the basic stage of the current study, and will continue to apply DED in the future.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 43--46
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Iron Phases Crystallization on the Durability of the Bimetallic Connection Between Ring Inserts and the Piston Casting
Autorzy:
Szucki, Michał
Piątkowski, Jarosław
Czerepak, M.
Powiązania:
https://bibliotekanauki.pl/articles/27314162.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
crystallization
Al-Si alloys
iron phases
pistons
automotive industry
krystalizacja
stopy Al-Si
fazy krystalizacji
tłoki
przemysł motoryzacyjny
Opis:
The article presents the most important causes of the unstable connection between cast iron ring inserts and the silumin casting of an engine piston. It is shown that manufacturing defects are mainly related to the alfin processing of inserts in Al-Si alloy (the so-called AS9 alloy). Exceeding the permissible iron content in AS9 alloy causes the crystallization of brittle -Al5FeSi phases. Their unfavorable morphology and large size are the main reasons for the weakening of the diffusion connection between the inserts and the piston, causing an unacceptable proportion of defective products. The study presented in this work was conducted under industrial conditions on a population of 10.000 pistons. Quality control data, production parameters, as well as the micro- and macro-structures of the cast iron inserts, and the interface area between the inserts and the silumin piston, were analyzed. Material and technological solutions have been proposed to reduce the occurrence of casting defects at the insert-piston joint. This includes the introduction of so-called "morphological correctors" of the -Al5FeSi phases, reducing the possibility of gaseous impurities in the AS9 alloy and optimizing the temperature of the alfin alloy.
Źródło:
Archives of Foundry Engineering; 2023, 23, 2; 112--118
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Operating Conditions on the Tribological Behavior of Zn-30Al-3Cu Bearing Alloy
Autorzy:
Savaşkan, Temel
Tan, Hasan Onur
Powiązania:
https://bibliotekanauki.pl/articles/27765066.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
Zn-30Al-3Cu alloy
sliding friction
lubricated wear
running condition-wear property relationship
Opis:
To determine the relationships between operating conditions and tribological properties of Zn-30Al-3Cu alloy, its wear characteristics were investigated at wide ranges of oil flow rate, pressure and sliding velocity using a block-on-disk type test apparatus. The results are compared to those of SAE 660 leaded bearing bronze. Wear loss of these materials increased with sliding distance, pressure and sliding velocity, but decreased slightly with oil flow rate. The relationships between operating conditions and lubricated wear properties of Zn-30Al-3Cu alloy were determined by nonlinear regression analysis of the experimental data. Lubricated wear behavior of the zinc-based alloy was discussed in terms its microstructure and mechanical properties, and test conditions.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 2; 607--616
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of Suspended Sediment Load Using Artificial Neural Network in Khour Al Zubair Port, Iraq
Autorzy:
Hassan, Ayman A.
Ibrahim, Husham T.
Al-Aboodi, Ali H.
Powiązania:
https://bibliotekanauki.pl/articles/24201740.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
suspended sediment concentration
multilayer perceptron
neural network
Khour Al-Zubair port
Basrah city
Opis:
The port of Khour Al-Zubair is located 60.0 km south of the city centre of Basrah; it is also located 105.0 kilometres from the northern tip of the Arabian Gulf. The main goal of this paper is to estimate the concentration of suspended deposit (SSC) in “Khour Al-Zubair” port using a Multilayer Perceptron Neural Network (MLP) based on hydraulic and local boundary parameters while also studying the effect of these parameters on estimating the SSC. Five input parameters (channel width, water depth, discharge, cross-section area, and flow velocity) are used for estimating SSC. Different input hydraulic and local boundary parameter combinations in the three sections (port center, port south, and port north) were used for creating nine models. The use of both hydraulic and local boundary parameters for SSC estimation is very important in the port area for estimating sediment loads without the need for field measurements, which require effort and time.
Źródło:
Journal of Ecological Engineering; 2023, 24, 6; 54--64
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł

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