Effect of heat treatment on fracture surfaces in recycled aluminium cast alloy

Hurtalová, Lenka; Tillová, Eva; Chalupová, Mária

doi:10.3311/pptr.7111

Cited by 4 publications

(4 citation statements)

References 11 publications

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“…However, the addition of magnesium caused the AlSi12 alloy to absorb much lower energy. These results are similar to the different studies reported in the previous literature (Hurtalová et al , 2013; Morin et al , 2016). It is believed that the magnesium-containing alloys absorb less energy in the tensile test and less energy in the impact test because of the brittle Mg 2 Si in their structure compared to the AlSi12 alloy.…”

Section: Resultssupporting

confidence: 93%

Effect of Mg addition on microstructure and mechanical properties of AlSi12 alloy produced by high-pressure casting method

Aksoy¹,

Kabakci

Acarer

et al. 2022

ILT

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Purpose Paper aims to an alloy development study was carried out to increase the mechanical properties of cylinder heads. Design/methodology/approach AlSi12 alloys are used to manufacture the compressor head cylinder by high-pressure casting for easy casting and superior properties. Therefore, 1.1%, 2.4% and 3.1% Mg were added to AlSi12. The microstructures of the produced samples were characterized by optical microscope, scanning electron microscopy, energy dispersive spectrometry and X-ray diffraction methods. Hardness and tensile tests as well as Charpy impact tests were performed. Wear tests were also carried out on the pin-on disc tester, and then the wear performance was examined on the tester, which simulates the actual operating condition. Findings AlSi12 has primary Si and eutectic Si in the Al matrix. However, alloys of Mg with AlSi12 have other intermetallics such as Mg2Si and ß-Fe, as well as primary Si and eutectic Si. Hardness and tensile strength as well as improved wear performance with increased Mg content. Originality/value In this study, wear performance test to simulate the operation of the cylinder head produced by high pressure casting from AlSi12 alloy moreover tensile test, hardness test and impact test were performed. Therefore, in this study, the wear performance of the compressor head produced by high-pressure casting method by adding three different amounts of Mg to AlSi12 alloy was investigated.

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Section: Resultssupporting

confidence: 93%

Effect of Mg addition on microstructure and mechanical properties of AlSi12 alloy produced by high-pressure casting method

Aksoy¹,

Kabakci

Acarer

et al. 2022

ILT

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“…Metallographic samples (2 cm x 1.5 cm) were sectioned from the casted test bars and standard prepared for metallographic observations such as -wet ground on SiC papers, DP polished with 3 μm diamond past followed by Struers Op-S, etched by 0.5 % HF or H 2 SO 4 (for helping the highlighting of Fe-intermetallic phases) . Some samples were also deep-etched for 30 s in HCl solution in order to reveal the three-dimensional morphology of the silicon phase (Hurtalová et al, 2013). The specimen preparation procedure for deep-etching consists of dissolving the aluminium matrix in a reagent (36 % HCl) that will not attack the eutectic components or intermetallic phases.…”

Section: Methodsmentioning

confidence: 99%

“…This is a considerable advantage in modern metallurgical industry. For the past 20 years the proportion of metal consumed that is recycled has grown steadily and today stands at something like 30 % of primary metal production (European Aluminium Association; Schlesinger, 2014;Hurtalová et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

The Effect of Iron Content on Microstructure and Porosity of Secondary AlSi7Mg0.3 Cast Alloy

Závodská

Tillová

Švecová

et al. 2018

Period. Polytech. Transp. Eng.

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In the present study, microstructure and porosity of AlSi7Mg0.3 cast alloy including various amounts (0.123; 0.454 and 0.655 wt. %) of iron were investigated. The alloys were produced as secondary (scrap-based -recycled IntroductionAutomotive -chassis, bodies, engine blocks, radiators, hubcaps, and etc. driven by consumer needs and increasingly tight regulations, the automobile industry has made ample recourse to aluminium. A European car today contains on average 100 kg of aluminium, taking advantage of multiple properties of the materials: lightness (a 100 kg loss of weight reduces fuel consumption by 0.6 litres/100 km and greenhouse gases by 20 %), resistance (improved road-handling, absorption of kinetic energy, shorter braking distance) and recycling (95 % of the aluminium contained in autos is collected and recycled, and represents over 50 % of the vehicle's total end-of-life value). Aluminium coming from recycling can allow 95 % energy savings and 85 % less CO 2 emissions compared to primary aluminium production. Recycling -aluminium can be recycled indefinitely without losing any of its intrinsic qualities. This is a considerable advantage in modern metallurgical industry. For the past 20 years the proportion of metal consumed that is recycled has grown steadily and today stands at something like 30 % of primary metal production (European Aluminium Association; Schlesinger, 2014;Hurtalová et al., 2013).The Fig. 1 shows the fraction of world aluminium production from primary and secondary (recycled) sources. About one-third of the aluminium produced in the world is now obtained from secondary sources and in some countries the percentage is much higher. The process used for recycling aluminium scrap is very much different from those used to produce primary metal but in many ways follow the same general sequence. This sequence begins with mining ore, followed by mineral processing and thermal pre-treatment and then a melting step. The metal is then refined, cast into ingots and sent to customers. Aluminium alloys recyclers also face similar challenges to the producers of primary aluminium; there is need to produce a consistent alloy with the required chemistry, reduce the amount of waste generated, minimize energy usage and manufacture the highest-quality product at the lowest possible cost from raw materials of uncertain chemistry and condition (Mc Millan et al., 2012;Schlesinger, 2014).Commercial Al-alloys always contain Fe, often as undesirable impurity and occasionally as a useful minor alloying

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“…The second step is water quenching at 40 °C and the third step is artificial aging at temperature 170 °C with holding time 4 hours, where solute atoms precipitate. These heat treatments were specified as optimum for secondary AlSi9Cu3 cast alloy at many previous studies [15][16][17][18].…”

Section: Experimental Workmentioning

confidence: 99%

Optimization of Eutectic Si Particles Morphology in Secondary Al-Si Cast Alloys after Different Heat Treatment

Hurtalová

Tillová

Chalupová

2014

AMR

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Secondary cast Al-Si alloys containing more of additions elements and forming various structural parameters (intermetallic phases). The optimization of structure parameters morphology is necessary because the mechanical properties depend on changes in morphology of eutectic Si and intermetallic phases in Al-Si cast alloy. This article describes changes of eutectic Si morphology after heat treatment T4 and T6. The morphology changes were observed using combination different analytical techniques - light microscopy (upon black-white etching) and scanning electron microscopy - SEM (upon deep etching). For the experiment was used recycled (secondary) aluminium cast alloy AlSi9Cu3.

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Effect of heat treatment on fracture surfaces in recycled aluminium cast alloy

Abstract: Abstract

Cited by 4 publications

References 11 publications

Effect of Mg addition on microstructure and mechanical properties of AlSi12 alloy produced by high-pressure casting method

Effect of Mg addition on microstructure and mechanical properties of AlSi12 alloy produced by high-pressure casting method

The Effect of Iron Content on Microstructure and Porosity of Secondary AlSi7Mg0.3 Cast Alloy

Optimization of Eutectic Si Particles Morphology in Secondary Al-Si Cast Alloys after Different Heat Treatment

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