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1
Content available remote In situ-formed, low-cost, Al-Si nanocomposite materials
Guba P., Gesing A.J., Sokolowski J., Conle A., Sobiesiak A., Das S. K.
Journal of Achievements in Materials and Manufacturing Engineering
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2017
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Vol. 84, nr 1
5--22
EN
Aluminum-Silicon (Al-Si) alloys are the “bread-and-butter” of the aluminum foundry industry being cast at an annual rate of over 2 million tonnes/year in North America for use mainly in transportation. Coarse microstructure of these alloys limits their specific mechanical properties and consequently their potential for vehicle lightweighting. Purpose: We report on a new family of cast Al-Si alloys producing in-situ formed nanocomposites of up to 25 vol.% ultrafine equiaxed silicon particles in Al alloy matrix which can be ductile, or reinforced by nano-scale spinodal constituents. Design/methodology/approach: The hypereutectic Al-Si-X alloy (A390) was melted, solidified and cooled on the novel High Pressure Die Casting Universal Metallurgical Simulator and Analyser Technology Platform (HPDC UMSA) at specific process parameters. The HPDC cast samples consecutively were solution treated and artificially aged to spheroidize the Si and to dissolve the intermetallics in Al(SS) and to re-precipitate them in the solid state as nano-sized spinodal structures. The heat treatment was performed using the High Temperature UMSA Technology Platform. Findings: The nano scale structure of these new materials gives them significantly improved strength, hardness, and wear resistance while retaining adequate toughness and ductility for applications in the transportation applications. Research limitations/implications: Desired composite nanostructures have been produced and characterized in-situ in small laboratory test samples. Practical implications: These new materials can be produced by conventional casting technologies such as continuous strip casting, or high-pressure die-casting from conventional low-cost Al-Si melts. Originality/value: These materials can be produced with a significantly higher volume fraction of ultrafine Si dispersoids than has been done to date in in-situ formed materials, while retaining and improving the density-specific mechanical properties.
2
Content available The Influence of Chosen Abrasive Wear Parameters on Fault-free Operation Time of the Cylinder-Piston System
Piątkowski J., Mesjasz A.
Archives of Foundry Engineering
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2015
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Vol. 15, iss. 3 spec.
69--72
EN
In the paper the method of data modeling for damages, that has values higher than zero, is being shown. With the use of Weibull distribution, with prior regression and correlation analysis, the chosen parameters, that define durability and break down level of two populations of AlSi17Cu5Mg, were set. The calculation sheet that is shown for reliability allows the creation of so called survival chart, and on the basis of durability data the average warrantee time can be defined at the pre-exploitation stage.
3
Content available Structure and Mechanical Properties of AlSiCuMg Alloy after Thermo Processing
Piątkowski J., Kamiński P.
Archives of Foundry Engineering
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2015
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Vol. 15, iss. 1
79--82
EN
In the dissertation it has been shown, that so called „time-thermal treatment” (TTT) of the alloy in liquid state, as overheating the metal with around 250°C above the Tliq. and detaining it in this temperature for around 30 minutes, improves the mechanical properties (HB, Rm, R0,2). It was ascertained, that overheating the AlSi17Cu5Mg alloy aids the modification, resulting with microcrystalline structure. Uniform arrangement of the Si primeval crystals in the warp, and α(Al) solution type, supersaturated with alloying elements present in the base content (Cu, Mg) assures not only increased durability in the ambient temperature, but also at elevated temperature (250°C), what is an advantage, especially due to the use in car industry.
4
Content available Fatigue Resistance of A390.0 Alloy Modified with Phosphorus
Wieszała R., Piątkowski J.
Archives of Foundry Engineering
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2015
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Vol. 15, iss. 3 spec.
99--102
EN
The paper presents fatigue tests (unilateral pulsating vibrations) for hypereutectic silumin AlSi17Cu5Mg aimed at simulation of deflection of the piston head in a combustion engine. The methodology of the tests and the way of marking the deflection of the tested material is described together with the detailed description of the test stand. The fatigue resistance ZG was identified in the tested material and a Wöhler diagram was prepared to show the areas of limited and unlimited fatigue resistance.
5
Content available Data Simulation with the Use of Weibull Analysis for Evaluation of Reliability of Chosen Assortment
Piątkowski J., Mesjasz A.
Archives of Foundry Engineering
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2015
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Vol. 15, iss. 3
47--50
EN
In the dissertation the data modeling has been shown for the data that regards the damages, which value is above zero. With the use of Weibull distribution, with prior regression and correlation analysis chosen parameters that defines the life time and failure level of two populations of AlSi17Cu5 were defined. The calculation sheet of reliability allows to create so called survival diagram, and on the basis of durability data the average warrantee can be determined, on the pre-exploitation period.
6
Content available Crystallization of AlSi17Cu5Mg Alloy after Time-thermal Treatment
Piątkowski J., Kamiński P.
Archives of Foundry Engineering
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2015
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Vol. 15, iss. 1
83--86
EN
In the dissertation it has been shown, that so called “time-thermal treatment” (TTT) of the alloy in liquid state as overheating the metal with around 250°C above Tliq. and detailing it in temperature for 30 to 40 minutes has the influence on changing the crystallization parameters (Tliq., TEmin., TEmax., TE(Me), TSol.). It was ascertained, that overheating the AlSi17Cu5Mg alloy substantially above Tliq. results with microcrystalline structure. Evenly distributed in the eutectic warp primeval silicon crystals and supersaturated with alloying additives of base content (Cu, Mg, Fe) of α(Al) solution, ensures not only increase durability in ambient temperature, but also at elevated temperature (250°C), what due to it’s use in car industry is an advantage.
7
Content available The mechanical properties of AlSi17Cu5 cast alloy after overheating and modification of CuP master alloy
Piątkowski J., Jabłońska M.
Archives of Foundry Engineering
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2013
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Vol. 13, iss. 3
68--71
EN
The paper presents the results of studies on the effect of the AlSi17Cu5 alloy overheating to a temperature of 920°C and modification with phosphorus (CuP10) on the resulting mechanical (HB, Rm, R0.2) and plastic (A5 and Z) properties. It has been shown that, so-called, "time-thermal treatment" (TTT) of an alloy in the liquid state, consisting in overheating the metal to about 250°C above Tliq., holding at this temperature by 30 minutes improves the mechanical properties. It has also been found that overheating of alloy above Tliq. enhances the process of modification, resulting in the formation of fine-grain structure. The primary silicon crystals uniformly distributed in the eutectic and characteristics of the \alfa(Al) solution supersaturated with alloying elements present in the starting alloy composition (Cu, Fe) provide not only an increase of strength at ambient temperature but also at elevated temperature (250°C).
8
Content available Assessment of AlSi21CuNi alloy’s quality with use of ATND method
Pezda J.
Archives of Foundry Engineering
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2013
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Vol. 13, iss. 4
87--92
EN
Majority of combustion engines is produced (poured) from Al-Si alloys with low thermal expansion coefficient, so called piston silumins. Hypereutectic alloys normally contain coarse, primary angular Si particles together with eutectic Si phase. The structure and mechanical properties of these alloys are highly dependent upon cooling rate, composition, modification and heat-treatment operations. In the paper one depicts use of the ATND method (thermal-voltage-derivative analysis) and regression analysis to assessment of quality of the AlSi21CuNi alloy modified with Cu-P on stage of its preparation, in aspect of obtained mechanical properties (R0,02, Rm, A5, HB). Obtained dependencies enable prediction of mechanical properties of the investigated alloy in laboratory conditions, using values of characteristic points from curves of the ATND method.
9
Content available remote Aluminum alloy semisolid strip casting using an unequal diameter twin roll caster
Haga T., Sakaguchi H., Inui H., Watari H., Kumai S.
Journal of Achievements in Materials and Manufacturing Engineering
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2006
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Vol. 14, nr 1-2
157--162
EN
Purpose: A Purpose of the present study was to break through the disadvantage of the twin roll caster for aluminum alloy. They were slow casting speed and limitation of alloy. For example, the casting speed was slower than 5 m/min, and casting of hypereutectic Al-Si alloy was difficult. In order to break through the disadvantages, semisolid casting using an unequal diameter twin roll caster was tested its ability. Design/methodology/approach: The specification of the unequal diameter twin roll caster is as below. The diameter of the upper roll was 250 mm, and that of the lower roll was 1000 mm. The width of the roll was 100 mm. The semisolid slurry was made by a cooling slope. Findings: The microstructure of the strip became very fine. Especially, primary and eutectic Si became very fine. This was the effect of rapid solidification. As the result, the ductility of Al-16%Si was improved. Research limitations/implications: 6111 aluminum alloy strip was cast at speeds of 5, 10 and 20 m/min. This caster could cast the strip at the speeds higher than the conventional twin roll caster. Start of casting was very easy. The hypereutectic Al-16%Si alloy, which has wide freezing zone, could be cast in to the strip by the unequal diameter twin roll caster. This was the effect of the cooling of the strip on the lower roll. Originality/value: The roll cast Al-16mass%Si strip had good ductility, and could be cold rolled. Annealed 0.5 mm thick Al-16mass%Si could be bent at radius of 0.75mm.
10
Content available remote Geometria nadtopień i struktura uszlachetnionych powierzchniowo odlewów z nadeutektycznego stopu Al-Si
Mróz M., Orłowicz A. W., Tupaj M.
Archiwum Odlewnictwa
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2005
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R. 5, nr 17
209--216
PL
W pracy przedstawiono wyniki pomiaru geometrii nadtopień i parametrów strukturalnych warstwy wierzchniej odlewów ze stopu AK 20 uszlachetnionej szybką krystalizacją. Proces szybkiej krystalizacji realizowano z wykorzystaniem nadtapiania powierzchniowego odlewów plazmą łuku elektrycznego – metoda GTAW (Gas Tungsten Arc Welding). Stosowano natężenie prądu 100, 200 i 300 A oraz prędkość przemieszczania plazmy łuku elektrycznego 200, 400 i 800 mm/min. Określono związki pomiędzy parametrami technologicznymi procesu GTAW, a geometrią nadtopień i strukturą materiału z obszaru nadtopień.
EN
In this work the results of measurement of the fusion geometry parameters and structural parameters of AK 20 alloy after rapid solidification were described. The rapid solidification process was realized with the GTAW method (Gas Tungsten Arc Welding).The current intensity 100A, 200A and 300A as well as electric travel speed 200 mm/min, 400 mm/min and 800 mm/min were used. The relationships between GTAW process parameters and fusion geometry parameters as well as structural parameters were defined.
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