Wyniki wyszukiwania - Biblioteka Nauki

1

Production of Melt-Spun Al-20Si-5Fe Alloy and Boron Carbide (B4C) Composite Material

100%

Kilicaslan M. F. , Uzun A. , Karakose E.

Archives of Metallurgy and Materials

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2018

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tom Vol. 63, iss. 2

597--600

EN

In this study, metal matrix composite materials containing melt-spun Al-20Si-5Fe alloys and boron carbide was produced by high energy ball milling and then hot pressing at 200 MPa pressure and 450°C. Mechanical and microstructural characterizations were performed by using an optical microscopy, X-Ray diffractometer, and dynamic microhardness tester. It was observed that boron carbide particles were homogenously distributed in the microstructure and values of microhardness and elastic modules were averagely 830 MPa and 42 GPa, respectively.

2

Improved Mechanical Properties of Al-Si Alloys by Adding an Extrusion Process to Conventional Processing Method

100%

Han J. Y. , Femi O. E. , Kilicaslan F. , Jeong C. U. , Baeg C. H. , Hong S. J. , Koo J. M.

Archives of Metallurgy and Materials

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2017

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tom Vol. 62, iss. 2B

1179--1183

EN

In this study, the mechanical properties of Al-Si alloys was improved by selecting higher Si content and avoiding distortion in Al-Si matrix by adding an extrusion process such that the fabrication processes casting and extrusion were in sequence. Cast billets were extruded at ratios 4:1 and 10:1 to obtained two extruded bars with different processing parameters. The as-extruded samples were characterized and investigated for microstructure and mechanical properties. Optical Microscope was used to examined phase morphologies and microstructures of the extruded Al-Si bars. Mechanical properties were conducted on each sample to study the effectiveness of the additional extrusion process in high Si content Al-Si alloys. The result shows that by increasing the extrusion ratio, the size of the primary Si particle reduces leading to a higher density, better tensile and yield strength compared to the cast billet.

3

Influence of Modifications on Fatigue Strength of AlSi17Cu5Mg(Fe) Alloy Used for Pistons for Internal Combustion Engines

100%

Piątkowski J. , Wieszała R.

Archives of Metallurgy and Materials

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2018

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tom Vol. 63, iss. 1

135--141

EN

Technological progress in construction of automotive vehicles, particularly in construction of engines, enforces simultaneous changes in foundry properties of aluminum alloys used in automotive industry. Until recently, abrasion resistance was the main usability criterion of a material used for pistons for internal combustion engines. At present however, because of the complexity of the process of the fuel mixture combustion, more restrictive standards of limited hydrocarbon emission, and the pursuit of reduction of the vehicle’s mass, fatigue strength of silumins enjoys a continuously increasing interest. The paper presents results of a computer simulation using the finite element method (FEM) and a real fatigue test of AlSi17Cu5Mg(0.5Fe) (A390.0) alloy with unilateral variable bending. The tests aimed to simulate a deflection of a combustion engine piston in a cylinder barrel were carried out in two variants: for a non-modified alloy and an alloy modified with CuP10 master alloy. Based on the distribution of stresses according to the Huber-Mises-Hencky theory (for a given range of the deflection from 0.1 to 0.3 mm), Wöhler curve was determined for the studied alloy. Based on on microstructural investigations, cracks of primary Si crystals were found, caused by fatigue changes resulting from unilateral pulsating vibrations.

4

Modification of Aluminium-Silicon Near-Eutectic Alloy with Use of Electrolysis of Sodium Salt

100%

Białobrzeski A. , Pezda J. , Jarco A.

Archives of Metallurgy and Materials

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2017

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tom Vol. 62, iss. 4

2371--2374

EN

The present work discusses results of preliminary tests concerning the technology of continuous dosage of sodium to a metallic bath from the aspect of modification of EN AC-44200 alloy, through the use of a multiple compound (salt) of sodium. The technology consists in continuous electrolysis of sodium salts occurring directly in a crucible with liquid alloy. As a measure of the degree of alloy modification over the course of testing, the ultimate tensile strength (UTS or Rm) and analysis of microstructure are taken, which confirm the obtained effects of the modification on the investigated alloy. Assurance of stable parameters during the process of continuous modification with sodium, taking into consideration the fact of complex physical-chemical phenomena, requires additional tests aimed at their optimization and determination of a possibility of implementation of such technology in metallurgical processes.

5

Tool wear characteristics in machining of hypereutectic Al-Si alloys by cemented carbide tool

100%

Kobaru Y. , Nagaoka R. , Shimana K. , Yoshimitsu S. , Kondo E.

Journal of Machine Engineering

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2020

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tom Vol. 20, No. 2

94--103

EN

During of hypereutectic Al-Si alloys, tool wear increases owing to the presence of silicon particles. Therefore, polycrystalline diamond tools are typically used, but they are very expensive. The purpose of this study is to examine the tool wear characteristics during the end milling of hypereutectic Al-Si alloy (A390–T6) by using comparatively inexpensive diamond-like carbon coated cemented carbide tools. Al-Si alloy was end-milled by changing the cutting speed. Our results revealed that the width of flank wear land increased monotonously with increasing of the cutting force regardless of the cutting speed. In addition, the experimental equation of the width of flank wear land was derived as a function of cutting speed and time, and it was clarified that width of flank wear land could be approximated.

6

Rozszerzalność przedskurczowa i skurcz liniowy aluminium i dwuskładnikowych stopów Al-Si

100%

Mutwil J.

Archiwum Technologii Maszyn i Automatyzacji

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2003

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tom Vol. 23, Nr 1

105-114

PL

Opisano stanowisko do badania ewolucji skurczu liniowego i naprężeń skurczowych w odlewie. Przedstawiono przykładowe ilustracje zmian skurczowych w aluminium i dwuskładnikowych stopach Al-Si. Wyjaśniono mechanizm rozszerzalności przedskurczowej.

EN

An experimental set-up for examination of the progress of linear contraction and shrinkage stresses in casting has been described. Exemplary illustrations of linear contraction progress in aluminum and binary aluminium-silicon alloys have been presented. The essence of pre-shrinkage expansion has been explained.

7

Effect of Solution Treatment on Age-Hardening Behavior of Al-12Si-1Mg-1Cu Piston Alloy with Trace-Zr Addition

100%

Kaiser M. S.

Journal of Casting & Materials Engineering

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2018

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tom Vol. 2, no. 2

30--37

EN

The influence of a solution treatment with a trace zirconium addition on the precipitation behavior of a cast Al-12%Si-1%Mg1%Cu piston alloy has been reported. The alloys were prepared by controlled melting and casting. The cast alloys were given an age-hardening treatment having a sequence of homogenization, T6 solutionizing, quenching, and aging. Both the cast and solutionized samples were naturally aged for 58 days, isochronally aged for 60 minutes at different temperatures (up to 350°C), and isothermally aged at various temperatures (up to 225°C) for different periods of time (ranging from 15 to 360 minutes). The hardness values of the differently processed alloys were measured to understand the aging behavior of the alloys. Electrical resistivity changes with aging time and temperature were measured to understand the precipitation behavior of the alloys. It is observed that significant hardening takes place in the aged alloys due to the formation of GP zones as well as the formation of metastable phases. The solutionizing treatment improves the hardness because some alloying elements are re-dissolved during solution treatment to produce a solute-rich solid solution. The trace-added Zr hinders the softening due to the precipitation of Al3Zr, which is very stable against coarsening and the re-dissolution of precipitates. Electrical resistivity decreases due to stress relieving, the dissolution of the metastable phase, and precipitation coarsening. The resistivity of the solutionized alloys decreases more due to the higher concentration of elements in the solid solution. A microstructural study of the alloys reveals that the solution treatment improves the distribution of the silicon grains. It is also observed that the alloys attained an almost fully re-crystallized state after aging at 350°C for 90 minutes.

8

Effect of silicon content on machinability of AL-SI alloys

100%

Akyüz B.

Advances in Science and Technology. Research Journal

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2016

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tom Vol. 10, nr 31

51--57

EN

In this study the effect of the change in the amount of Silicon (Si) occuring in Al-Si alloys on mechanical and machinability properties of the alloy was investigated. The change in mechanical properties and microstructure, which depends on the increase in Si percentage, and the effects of this change on Flank Build-up (FBU), wear on the cutting edge, surface roughness, and machinability were also studied. Alloys in different ratios of Si (i.e. 2 to 12 wt %), were employed in the study. The specimens for tests were obtained by casting into metal moulds. The results obtained from experimental studies indicate improved mechanical properties and machinability, depending on the rise in Si percentage in Al-Si alloys. It is also observed that the increase in Si percentage enhanced surface quality.

9

The Influence of Laser Surface Remelting on the Microstructure of EN AC-48000 Cast Alloy

88%

Piątkowski J. , Grabowski A. , Czerepak M.

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10

Zastosowanie analizy termicznej i kalorymetrycznej do badań przemian fazowych w siluminach

75%

Piątkowski J.

Rudy i Metale Nieżelazne

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2008

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tom R. 53, nr 1

3-8

PL

W artykule wyznaczono wartości entalpii topnienia i krzepnięcia siluminów AlSi6 AlSi12 oraz AlSi18 podczas nagrzewania i chłodzenia po procesie modyfikowania. Pomiary kalorymetryczne, poprzedzone badaniami metodą analizy termicznej ATD przeprowadzono na wysokotemperaturowym kalorymetrze skaningowym multi HTC firmy SETARAM metodą bezpośredniego określania parametrów procesów wysokotemperaturowych, a w szczególności entalpii zachodzących przemian fazowych. Nowoczesny sprzęt badawczy, w połączeniu z komputerem, stanowi bardzo dokładną metodę określania przemian zachodzących podczas nagrzewania i chłodzenia. Dodatkowym atutem jest odpowiedni program SETSOFT, dzięki któremu można było wyznaczyć entalpię interesującej przemiany fazowej, czego utylitarną konsekwencją jest możliwość oceny trwałości termicznej, zwłaszcza nowo opracowanych konstrukcyjnych stopów odlewniczych. Określono także skład fazowy badanych siluminów.

EN

The study was related with determination of the values of enthalpy of melting and solidification of AlSi6 AlSi12 and AlSi18 silumins during heating and cooling process after modification. The calorimetry, preceded by thermal analysis and derivative thermal analysis (DTA, respectively) was carried out on a high-temperature scanning calorimeter, model multi HTC, made by SETARAM, applying the method of direct determination of parameters of the high-temperature process, and in particular of the enthalpy of phase transformations. Modern control and measuring instruments coupled with computer provide a very precise tool for determination of these transformations during heating and cooling. An additional advantage was development of appropriate software called SETSOFT, owing to which it was possible to determine in an easy way the enthalpy of the investigated phase transformations.

11

Własności rezystancyjne powłok PVD ze stopów AlSi

75%

Kucharska B. , Kowalczyk J.

Elektronika : konstrukcje, technologie, zastosowania

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2015

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tom Vol. 56, nr 8

48-50

PL

Nowoczesne metody modyfikacji własności i ochrony powierzchni materiałów, do których należy metoda fizycznego osadzania z fazy gazowej (PVD) znalazły zastosowanie w różnych gałęziach przemysłu, w tym w elektronice. Ze względu na silne rozdrobnienie struktury, powłoki metaliczne wytworzone tą metodą posiadają znacznie lepsze własności mechaniczne i odporność korozyjną w porównaniu do stopów wytworzonych metodami konwencjonalnymi. W pracy przedstawiono badania własności elektrycznych powłok Al-Si wykonanych metodą PVD. W procesie magnetronowym rozpylano targety ze stopów pod-, około- i nadeutektycznego. Powłoki badano w różnej temperaturze indukowanej przepływem przez nie prądu elektrycznego. W oparciu o charakterystyki prądowo-napięciowe, wyznaczono rezystancję powłok w każdej z temperatur. Określono wpływ udziału krzemu w powłoce oraz przygotowania stopów na targety (homogenizacja, modyfikacja TiAlB) na rezystancję powłok i ich temperaturę podczas badania.

EN

Modern methods of modification of the properties and protection of material surface, which embrace gaseous phase physical deposition (PVD) methods, arouse the interest of many branches of industry, as well as of electronics. By virtue of their fine-grained structure, metallic coatings fabricated by these methods have superior mechanical properties and corrosion resistance compared to alloys made by traditional technologies. The paper presents a study of the electrical properties and structure of Al-Si coatings made by PVD method. Targets of hypo-, peri- and hyper-eutectic composition alloys, respectively, were sputtered in the magnetron process. The Al-Si coatings under various temperature conditions induced by the flow of electric current through the coatings was examined. Based on the current-voltage parameters, the coatings electrical resistance was determined at specified temperatures. The effects of silicon content in the coating and the preparation of target alloys (homogenization, modification TiAlB) on the electrical resistance of coatings and their temperature during the test was determined.

12

Morphology of intermetallic phases in Al-Si cast alloys and their fracture behaviour

75%

Hurtalova L. , Tillova E. , Chalupova M. , Belan J.

Production Engineering Archives

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2015

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tom Vol. 6, No. 1

2--5

EN

Applications of Al-Si cast alloys in recent years have increased especially in the automotive industry (dynamic exposed cast, engine parts, cylinder heads, pistons and so on). Controlling the microstructure of secondary aluminium cast alloys is very important, because these alloys contain more additional elements that form various intermetallic phases in the structure. Therefore, the contribution is dealing with the valuation type of intermetallic phases and their identification with using optical and scanning microscopy. Some of the intermetallic phases could be identified on the basis of morphology but some of them must be identified according EDX analysis. The properties of aluminium alloy are affected by morphology of intermetallic phases and therefore it is necessary to study morphology and its fracture behaviour. The present work shows morphology and typical fracture behaviour as the most common intermetallic phases forming in Al-Si alloys.

13

Contribution to the Identification of Porosity Type in AlSiCu High-Pressure-Die-Castings by Experimental and Virtual Way

75%

Ignaszak Z. , Hajkowski J.

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nr 1

14

Ocena niezawodności odlewniczych stopów Al na podstawie właściwości wytrzymałościowych

75%

Gierek A. , Piątkowski J. , Szymszal J.

Archiwum Odlewnictwa

|

2006

|

tom R. 6, nr 19

123-130

PL

Ocenę niezawodności odlewniczych stopów Al., określoną modułem Weibulla, wyznaczono na przykładzie wyników badań wytrzymałości na rozciąganie i zginanie dla nadeutektycznego siluminu AlSi17Cu4Mg w stanie po odlaniu, po modyfikacji 0,05% fosforem, po obróbce cieplnej oraz po łącznym procesie modyfikacji z obróbką cieplną. Na tej podstawie, oszacowano wytrzymałość, a więc niezawodność odlewu n-razy większego od badanej próbki, określając tzw. "efekt skali" w funkcji masy wyrobu rzeczywistego dla każdego z analizowanych etapów produkcyjnych.

EN

Evaluation of cast Al alloys reliability, expressed by Weibull's modulus, was determined on example of tensile and bending strength tests of hypereutectic AlSi17Cu4Mg silumin. The alloy was investigated in as-cast state, modified state (0,05% of phosphorus), after heat treatment as well as after process combining modification and heat treatment. On this basis the strength and hence the reliability of cast n-times bigger then the investigated sample was estimated. These results enabled determination of scale effect in function of mass of real products mode of the investigated silumin in each analysed manufacturing stages.

15

Zdolność dwuskładnikowych stopów Al - Si do odwzorowania formy

75%

Mutwil J. , Janowski R.

Archiwum Odlewnictwa

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2002

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tom R. 2, nr 6

135-140

PL

Przedstawiono wyniki badań zdolności aluminium i jego stopów z krzemem do odwzorowania formy. Przepływ realizowano w pionowym, metalowym kanale [średnica] 16 mm.

EN

The investigations results of mould surface reproducibility of aluminum and Al - Si alloys have been presented. The metal flow was realized in vertical metal channel of 16 mm diameter.

16

Mechanical properties the Al-7%SiMg alloy with CuAl10Fe3Mn2 used in machine building and civil engineering

75%

Lipiński T.

Quality Production Improvement - QPI

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2020

|

tom Vol. 2, Iss. 1

247--258

EN

Silumins are one of the most popular group among aluminum casting alloys. They are characterized by good mechanical and casting properties, low density, good electric and thermal conductivity, a low degree of contraction, good corrosion resistance and a relatively low melting temperature. The mechanical properties of hypoeutectic silumins can be improved through chemical modification as well as traditional or technological processing. Modification improves the mechanical properties of alloys through grain refinement. The effect of treatment has been given a lot of information first of all about microstructure and mechanical properties. This study presents the results of treatment of an Al-7%SiMg alloy with composition CuAl10Fe3Mn2 (as a powder) + (Al-7%SiMg + CuAl10Fe3Mn2) (as a powder) + (Al-7%SiMg + CuAl10Fe3Mn2) (in the form of a rod) in three different ranges. The experiments were conducted following a factor design 23 for 3 independent variables. The main addition was aluminum bronze, as well as clear or melted with raw alloy. The influence of the analyzed modifiers on the microstructure and mechanical properties of the processed alloy was presented in graphs. The modification of a hypoeutectic Al-7%SiMg alloy improved the alloy's properties. The results of the tests indicate that the mechanical properties of the modified alloy are determined by the components introduced to the alloy.

17

Określenie temperatury i entalpii przemian fazowych w stopach Al-Si

63%

Binczyk F. , Piątkowski J. , Przeliorz R.

Archiwum Odlewnictwa

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2006

|

tom R. 6, nr 22

65-70

PL

W pracy przedstawiono wyniki pomiarów wartości temperatury i entalpii procesów topnienia i krzepnięcia, przebiegających w stopach Al-Si o zróżnicowanej zawartości krzemu. Badania prowadzono w wysokotemperaturowym kalorymetrze różnicowym Multi HTC, firmy Setaram. Określono wartość ciepła topnienia i ciepła krzepnięcia eutektyki oraz dendrytów fazy [alfa]. Wskazano na różnice pomiarów i obliczeń.

EN

In this work the results of measurements and calculations of enthalpy of melting or solidification as well as phase transformations in the solid were analysed. The Al-Si alloys with different content of silicium were subjected to investigations. The high temperature scanning calorimeter Multi HTC-Setaram was applied. The obtained results are: enthalpy of melting, enthalpy of solidification.

18

Charakterystyka tribologiczna kompozytu A390/Gr

63%

Walczak M. , Bieniaś J. , Pasierbiewicz K.

Autobusy : technika, eksploatacja, systemy transportowe

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2016

|

tom R. 17, nr 11

149--151

PL

Artykuł przedstawia wyniki badań tribologicznych kompozytu A390/Gr (zawierającego cząsteczki grafitu w ilości 5,7% wag.) i jego osnowy AlSi20CuNi. Kompozyt ten znajduje zastosowanie, jako nowoczesny materiał konstrukcyjny w przemyśle motoryzacyjnym, szczególnie na tłoki, tuleje cylindrowe i łożyska ślizgowe. Pomiary współczynnika tarcia wykonano na tribotesterze typu „ball-on-disc” z przeciwpróbkami (ball) w postaci kulek wykonanych ze stali 100Cr6. Badano współczynnik zużycia i współczynnik tarcia próbki, a ślady zużycia poddano obserwacjom SEM. Ocenę istotności zmian współczynnika zużycia przeprowadzono testem U Manna-Whitneya. Odporność na zużycie stopu osnowy i kompozytu zostały poddane analizie porównawczej. Wykazano, że kompozyt zbrojony grafitem charakteryzuje się mniejszym współczynnikiem tarcia i mniejszym zużyciem w porównaniu do osnowy.

EN

The paper presents the results of tribological research on A390/Gr composite (containing graphite particles in the amount of 5.7% wt.%) and on AlSi20CuNi its matrix. This composite is used in automotive industry, particularly for pistons, cylinder liners and slide bearings. Friction coefficient measurements were performed on „ball-on-disc” tribotester with counter-specimen (ball) made of steel 100Cr6. Were tested wear rate and coefficient of friction of the sample, the tracks of wear was SEM observation. The evaluation of the significance of changes in wear factor was conducted by Manna-Whitney U test. It was demonstrated that the composite reinforced with graphite is characterized by lower friction coefficient and lower wear in comparison to the matrix.

19

Optymalizacja zabiegów rozdrobnienia ziarna i modyfikacji eutektyki w pod- i okołoeutektycznych stopach Al-Si

63%

Saja K.

Prace Instytutu Odlewnictwa

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2016

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tom Vol. 56, no. 4

351--361

PL

Zabiegi rozdrobnienia ziarna i modyfikacji eutektyki krzemowej w siluminach pod- i okołoeutektycznych należą do ważnych czynników kształtujących ich mikrostrukturę oraz właściwości fizyko-mechaniczne i technologiczne. Z uwagi na ten fakt w publikacji zostały podjęte zadania odpowiedniego, optymalnego doboru dodatków rozdrabniających αAl − roztwór stały oraz modyfikujących eutektykę krzemową (αAl + βSi), w zależności od stopnia eutektyczności układu Al-Si. Wytopy realizowane były w Zakładzie Stopów Metali Nieżelaznych Instytutu Odlewnictwa w Krakowie zgodnie z planem doświadczeń. Otrzymane wyniki badania właściwości mechanicznych (Rm, Rp0,2, A5, Z i HB) poddane zostały obróbce statystycznej. Wyniki te, na podstawie opracowanej interpretacji graficznej, pozwalają w łatwy sposób na właściwy dobór ilości rozdrabniacza (Ti5B1) i modyfikatora krzemu eutektycznego (AlSr10), w zależności od zawartości krzemu (w % wag.) w układzie Al-Si.

EN

The procedures of grain refinement and modification of a silicon eutectic in hypo- and transeutectic silumins belong to important factors shaping their microstructure as well as physico-mechanical and technological properties. Due to this fact, the study attempts to address a proper, optimal, selection of refining additions αAl − a solid solution as well as additions modifying the silicon eutectic (αAl + βSi), depending on the eutecticity degree of the Al-Si system. The melts were realized at the Department of Non-Ferrous Metal Alloys of the Foundry Research Institute in Kraków. according to the experiment schedule. The obtained results of the examinations of the mechanical properties (Rm, Rp0.2, A5, Z and HB) underwent statistical treatment. The results, based on elaborate graphic interpretation, enable an easy selection of the amount of refiner (Ti5B1) and modifier of the eutectic silicon (AlSr10), depending on the silicon content (at wt. %) in the Al-Si system.

20

Struktura i właściwości mechaniczne odlewu ze stopu Al-Si określane z wykorzystaniem symulacji krzepnięcia

63%

Hajkowski M. , Ignaszak Z. , Mikołajczak P. , Popielarski P.

Archiwum Technologii Maszyn i Automatyzacji

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2002

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tom Vol. 22, Nr 1

77-87

PL

Właściwości mechaniczne odlewów zależą od parametrów struktury krystalicznej, te zaś od składu stopu i warunków krzepnięcia odlewów. Warunki krzepnięcia można opisać za pomocą lokalnego gradientu temperatury, a następnie zastosować go do prognozowania wymienionych właściwości. W artykule do wyznaczenia gradientu wykorzystano metodę polegającą na połączeniu eksperymentów: rzeczywistego i numerycznego z wykorzystaniem systemu symulacyjnego PAMCAST Simulor oraz programu Ćalcosoft. Wartości gradientu temperatury i kąta jego ukierunkowania uzyskane z symulacji zastosowano do obliczeń parametrów struktury krystalicznej i właściwości mechanicznych na przekroju odlewu z podeutektycznego stopu AlSi8,7.

EN

The paper presents the distribution of experimental and simulated values of local solidification time and temperature gradient of a cylindrical casting made of AlSi8,7 alloy, solidifying in a mould made of quartz sand. Simulation conditions were determined on the ground of an inverse solution obtained by means of the Calcsoft program. Simulation of the solidification process was carried out with the PAMCAST Simulor code. Simulated values of temperature gradient and its position angles were applied to the computation of the parameters of the crystalline structure and mechanical properties at the casting section.