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Mechanical Properties and Melt Quality Relationship of Sr-modified Al-12Si Alloy

F. Yilmaz M. Uludağ M. Uyaner D. Dişpinar

Archives of Foundry Engineering | 2015 | No 4 | DOI: 10.1515/afe-2015-0093

Keywords Aluminum-silicon alloys Modification Quality of casting Bifilm index porosity

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Abstract

The formation of oxide film on the surface of aluminium melts, i.e. bifilms, are known to be detrimental when they are incorporated into

the cast part. These defects causes premature fractures under stress, or aid porosity formation. In this work, Al-12 Si alloy was used to cast

a step mould under two conditions: as-received and degassed. In addition, 10 ppi filters were used in the mould in order to prevent bifilm

intrusion into the cast part. Reduced pressure test samples were collected for bifilm index measurements. Samples were machined into

standard bars for tensile testing. It was found that there was a good agreement with the bifilm index and mechanical properties.

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Authors and Affiliations

F. Yilmaz

M. Uludağ

M. Uyaner

D. Dişpinar

Evaluation of the Possibility of Applying Thermal Barrier Coatings to AlSi7Mg Alloy Castings

Marek Mróz Patryk Rąb

Archives of Foundry Engineering | 2023 | vol. 23 | No 3 | 104-109 | DOI: 10.24425/afe.2023.146668

Keywords thermal barrier coating aluminum-silicon alloy atmospheric plasma spraying

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Abstract

This paper analyses the possibility of applying thermal barrier coatings (TBCs) onto a substrate made of the AlSi7Mg alloy, intended for, among other things, internal combustion engine components. Engine components made of aluminum-silicon alloys, especially pistons and valve heads, are exposed to high temperature, pressure and thermal shock resulting from the combustion of the fuel-air mixture. These factors cause degradation of these components and can lead to damage. To minimize the risk of damage to engine components caused by heat stress, one way is to apply TBCs. Applying TBCs coatings to engine components improves their durability, increases power output and reduces fuel consumption. The research scope includes the application of an Al2O3-TiO3 coating via the APS (Air Plasma Spraying or Atmospheric Plasma Spraying) method onto a substrate of the AlSi7Mg alloy, analysis of the microstructure and chemical composition of the substrate and coating material, and assessment of the quality of the coating's bond with the AlSi7Mg alloy substrate using the scratch test method.

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Bibliography

[1] Chen, C., Sun, C., Wang, W., Qi, M., Han, W., Li, Y., Liu, X., Yang, F., Gou, L. & Guo, Z. (2022). Microstructure and mechanical properties of in-situ TiB2/AlSi7Mg composite via powder metallurgy and hot extrusion. Journal of Materials Research and Technology. 19, 1282-1292. https://doi.org/10.1016/j.jmrt.2022.05.117.
[2] Rambabu, P., Eswara Prasad, N., Kutumbarao, V.V., Wanhill, R.J.H. (2017). Aluminium Alloys for Aerospace Applications. In: Prasad, N., Wanhill, R. (eds) Aerospace Materials and Material Technologies . Indian Institute of Metals Series. Springer, Singapore. https://doi.org/10.1007/978-981-10-2134-3_2.
[3] Sonsino, C.M. & Franz, R. (2017). Multiaxial fatigue assessment for automotive safety components of cast aluminium EN AC-42000 T6 (G-AlSi7Mg0. 3 T6) under constant and variable amplitude loading. International Journal of Fatigue. 100(2), 489-501. https://doi.org/10.1016/j.ijfatigue.2016.10.027.
[4] Dolata, A.J., Dyzia, M., Jaworska, L. & Putyra, P. (2016). Cast hybrid composites designated for air compressor pistons. Archives of Metallurgy and Materials. 61(2A), 705-708. http://dx.doi.org/10.1515%2Famm-2016-0120.
[5] Siadkowska, K. & Czyż, Z. (2019). Selecting a material for an aircraft diesel engine block. Combustion Engines. 58(3), 4-8. DOI: http://dx.doi.org/10.19206/CE-2019-301.
[6] Floweday, G., Petrov, S., Tait, R.B. & Press, J. (2011). Thermo-mechanical fatigue damage and failure of modern high performance diesel pistons. Engineering Failure Analysis. 18(7), 1664-1674. https://doi.org/10.1016/j.engfailanal.2011.02.002.
[7] Azadi, M., Mafi, A., Roozban, M. & Moghaddam, F. (2012). Failure analysis of a cracked gasoline engine cylinder head. Journal of Failure Analysis and Prevention. 12, 286-294. https://doi.org/10.1007/s11668-012-9560-6.
[8] Krstic, B., Rasuo, B., Trifkovic, D., Radisavljevic, I., Rajic, Z. & Dinulovic, M. (2013). Failure analysis of an aircraft engine cylinder head. Engineering Failure Analysis. 32, 1-15. https://doi.org/10.1016/j.engfailanal.2013.03.004.
[9] Jing, G.X., Zhang, M.X., Qu, S., Pang, J.C., Fu, C.M., Dong, C., Li, S. X., Xu, C.G. & Zhang, Z.F. (2018). Investigation into diesel engine cylinder head failure. Engineering Failure Analysis. 90, 36-46. https://doi.org/10.1016/j.engfailanal.2018.03.008.
[10] Sharma, P., Dwivedi, V.K. & Kumar, D. (2021). A review on thermal barrier coatings (TBC) usage and effect on internal combustion engine. Advances in Fluid and Thermal Engineering: Select Proceedings of FLAME 2020, 77-85. https://doi.org/10.1007/978-981-16-0159-0_8.
[11] Dhomne, S. & Mahalle, A.M. (2019). Thermal barrier coating materials for SI engine. Journal of materials research and technology. 8(1), 1532-1537. https://doi.org/10.1016 /j.jmrt.2018.08.002.
[12] Gürbüz, H. (2022). Experimental investigation of the effects of ethanol‐diesel mixture on the performance and emissions of the thermal barrier coated diesel engine. Environmental Progress & Sustainable Energy. 41(1), e13718. https://doi.org/10.1002/ep.13718.

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Authors and Affiliations

Marek Mróz

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Patryk Rąb

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Physical Modelling of the Production of an Alloy Vapour Source for the Synthesis of Dielectric Material

M. Nadolski G. Stradomski K. Zdunek S. Okrasa

Archives of Metallurgy and Materials | 2020 | vol. 65 | No 1 | 201-206 | DOI: 10.24425/amm.2019.131115

Keywords aluminum-silicon alloy magnetron sputtering processes gravity casting die casting

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Abstract

The paper reports the results of a physical modelling study of the production of a hypereutectic aluminium alloy to be used for making an alloy vapour source for operation in the magnetron. Within the study, targets from a hypereutectic aluminium-silicon alloy were made in laboratory conditions. Thus obtained material was subjected to heat treatment, porosity analysis, and the assessment of the microstructure and fitness for being used in the magnetron. The process of melting the hypereutectic Al-Si alloy was carried out at the Department of Foundry of the Czestochowa University of Technology. The investigation into the production of the alloy vapour source for the synthesis of the dielectric material from the hypereutectic aluminium alloy has confirmed.

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Authors and Affiliations

M. Nadolski

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G. Stradomski

K. Zdunek

S. Okrasa

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Mechanical Properties and Melt Quality Relationship of Sr-modified Al-12Si Alloy

Abstract

Authors and Affiliations

Evaluation of the Possibility of Applying Thermal Barrier Coatings to AlSi7Mg Alloy Castings

Abstract

Bibliography

Authors and Affiliations

Physical Modelling of the Production of an Alloy Vapour Source for the Synthesis of Dielectric Material

Abstract

Authors and Affiliations