Enhanced Mechanical Properties of Aluminium Alloy EN AW 6082 Recycled without Remelting

Krolo, Jure; Lela, Branimir; Ljumović, Petar; Bagavac, Petra

doi:10.17559/tv-20180212160950

Cited by 3 publications

(3 citation statements)

References 14 publications

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“…In this case, the liquid acts as a lubricant, resulting in better flow, lower viscosity, and forces required to form the raw material [16]. SSMP offers numerous advantages, including lower energy consumption [17], reduced mould wear due to lower shaping temperatures [18], casting without turbulence and thus lower porosity in the castings due to a more viscous mixture [19], and improved mechanical properties [18,[20][21][22]. There are many methods to explain the microstructure of the slurry, which can be categorised into two main categories: rheo processes and thixo processes.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Behaviour of Recycled Aluminium AlSi9Cu3(Fe) Machining Chips by Hot Extrusion and Thixoforming

Gudić,

Vrsalović,

Krolo

et al. 2024

Sustainability

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The corrosion properties of an EN AC AlSi9Cu3(Fe) alloy (reference sample (RS)) and samples produced by recycling chips of RS by direct hot extrusion (DHES) and subsequent thixoforming (TFS) were tested in 0.5 M NaCl solution. The plastic deformation changes the microstructure of RS, and brittle, coarse Si particles and intermetallic compounds (IMCs) were effectively broken into ultrafine-grained particles and redistributed homogeneously into the α-Al matrix in DHES. TFS exhibits a globular structure, and polyhedral clusters rich in Si and IMCs were observed along the grain boundary. Electrochemical measurements combined with surface characterisation show that the microstructure significantly influences the tested samples’ corrosive properties. It was confirmed that corrosion resistance increased in the following order: RS < TFS < DHES. Similarly, the corrosion potential becomes nobler, the corrosion current decreases, the passive area increases, and the oxide layer becomes more stable (higher resistance and thickness). Also, the percentage of the surface affected by corrosion and the volume of pits reduce. The effect of microstructure is particularly pronounced in the level of the corrosion current and the volume of pits formed. The corrosion current of DHES and TFS decreases by 4–5 times, while the pit volume of DHES and TFS decreases by several orders of magnitude compared to RS. The corrosion stability of DHES and TFS in relation to RS is a consequence of the comminution of the Si particles and the IMC. The refined and homogeneous microstructure contributes positively to forming a stable oxide film on DHES and TFS and increases their corrosion resistance in an aggressive environment. The applied recycling method represents an innovative and sustainable process for the recycling of semisolid materials, with lower energy consumption and less greenhouse gas emissions compared to conventional recycling. The fact that the products obtained through recycling have a significantly higher corrosion resistance further increases the economic and environmental impact of the process.

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Section: Introductionmentioning

confidence: 99%

Corrosion Behaviour of Recycled Aluminium AlSi9Cu3(Fe) Machining Chips by Hot Extrusion and Thixoforming

Gudić,

Vrsalović,

Krolo

et al. 2024

Sustainability

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“…Trace amounts of iron Fe, in an amount of 0.3% -0.5% in Al-Si alloys is generally desirable. The presence of a small portion of iron has a positive effect on the running property of the alloy, prevents the alloy from attaching to the mold walls, increases the strength and, in larger quantities, the heat resistance [13,14].…”

Section: Introductionmentioning

confidence: 99%

Archives of Foundry Engineering

Gaspar,

Majerník,

Trytek

et al. 2022

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The production of high pressure die casts also brings difficulties regarding the processing of the waste material. It is mainly formed by runners, overflows and other foundry supplements used and, in the case of machines using the cold chamber, also the remainder from this chamber. As this material is often returned to the production process, we refer to it as return material. In the production process, it is therefore essential to deal with the proportion issue of return material against primary material that can be added to the melt to maintain the required cast properties. The submitted article monitors the quality properties of the alloy, selected mechanical properties of casts and porosity depending on the proportion of the return material in the melt. At the same time, the material savings are evaluated with regards to the amount of waste and the economic burden of the foundries. To monitor the above-mentioned factors, series of casts were produced from the seven melting process variants with a variable ratio of return to the primary material. The proportion ratio of return material in the primary alloy was adjusted from 100% of the primary alloy to 100% of the return material in the melting process. It has been proven that with the increasing proportion of the return material, the chemical composition of the melt changes, the mechanical properties of the alloy decrease and the porosity of the casts increases. Based on the results of the tests and analyzes, the optimal ratio of return and primary material in the melting process has been determined. Considering the prescribed quality of the alloy and mechanical properties, concerning the economic indicator of the savings, the ratio is set at 70:30 [%] in favor of the primary material.

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“…The forgeability increases at elevated temperatures up to 160 °C [6]. The forgeability can increase up to 159% with warm forging [7]. Grain recovery effects the deformability [8].…”

Section: Introductionmentioning

confidence: 99%

Investigation of forging performance for AA6082

Tunc¹,

Kaçar

Öztürk

2021

Int J Adv Manuf Technol

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6XXX series aluminum alloys are generally excellent alternatives to steels for many forged parts in aerospace and automotive industries. In this study, the forging performance of the 6082 aluminum alloy is investigated in order to replace the existing material for forged steel parts. The effect of artificial aging of the alloy on the microstructure and mechanical properties is studied. Optimum aging conditions are determined. Results reveal that AA6082 could be a good replacement for applications where shock and vibrational loads exist. The rod end part currently manufactured from AISI1045 can be replaced by AA6082 without any design changes. The major drawback is that the cold forging of the aged alloy is poor due to its brittle nature and crack initiations. Therefore, warm or hot forging is recommended to overcome the poor forgeability.

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Enhanced Mechanical Properties of Aluminium Alloy EN AW 6082 Recycled without Remelting

Cited by 3 publications

References 14 publications

Corrosion Behaviour of Recycled Aluminium AlSi9Cu3(Fe) Machining Chips by Hot Extrusion and Thixoforming

Corrosion Behaviour of Recycled Aluminium AlSi9Cu3(Fe) Machining Chips by Hot Extrusion and Thixoforming

Archives of Foundry Engineering

Investigation of forging performance for AA6082

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