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Influence of Si and cooling rate on microstructure and mechanical properties of Al–Si–Mg cast alloys
RISE, SP – Sveriges Tekniska Forskningsinstitut.
2016 (English)In: Surface and Interface Analysis, ISSN 0142-2421, E-ISSN 1096-9918, Vol. 48, no 8, 861-869 p.Article in journal (Refereed) Published
Abstract [en]

This paper aims to investigate the effect of Si-content and microstructure on mechanical properties of Al–Si–Mg alloys with the purpose of to develop high-strength cast aluminum alloys that are anodizable. The Si-content was 2.5, 3.5 and 5.5 wt% Si, and both Sr-modified and unmodified conditions were used. The samples were produced using the gradient solidification furnace to generate a well-controlled microstructure. The resulting secondary dendrite arm spacing was 10 and 20 µm. The microstructural features were evaluated by employing SEM/EDS and optical microscopy. Furthermore, computed tomography (CT) scan technology was used to provide a 3D view of high-density phases in the microstructure. The mechanical properties of these alloys were studied by means of tensile and hardness testing where the latter was performed on the macrolevel and microlevel. The results demonstrate clearly how the Si growth in the microstructure is restricted by increased cooling rate and modification and its role in strength development in Al-Si alloys. Additionally, the CT scan visualized the morphology of intermetallics and supported in identifying the oxide layer growth as a result of the anodizing process. Copyright © 2015 John Wiley & Sons, Ltd. Copyright © 2015 John Wiley & Sons, Ltd.

Place, publisher, year, edition, pages
2016. Vol. 48, no 8, 861-869 p.
Keyword [en]
Al–Si alloys, anodizing, hardness, mechanical properties, microstructure, Aluminum, Aluminum alloys, Anodic oxidation, Computerized tomography, Cooling, High strength alloys, Intermetallics, Microstructural evolution, Silicon, Tensile testing, Al-Si alloy, Cast aluminum alloy, Computed tomography scan, Gradient solidifications, Microstructural features, Microstructure and mechanical properties, Secondary dendrite arm spacing, Strength development, Silicon alloys
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:ri:diva-27633DOI: 10.1002/sia.5814Scopus ID: 2-s2.0-84940688989OAI: oai:DiVA.org:ri-27633DiVA: diva2:1059548
Note

References: Kaufman, J.G., Rooy, E.L., (2004) Aluminum alloy casting properties, process and application, , 0-87170-803-5 ASM International, United States of America; Barresi, J., Kerr, M.J., Wang, H., Couper, M.J., (2000) AFS Trans., p. 563; Gupta, M., Ling, S., (1999) J. Alloys Compd., 287, p. 284; Okayasu, M., Yoshida, S., (2015) Int. J. Cast Metal. Res., 28, p. 105; Seifeddine, S., Sjölander, E., Bogdanoff, T., (2013) Mater. Sci. Appl., 4, p. 171; Seifeddine, S., Svensson, I.L., (2006) J. Int. Foundry Res., 58, p. 50; Tavitas-Medrano, F.J., Gruzleski, J.E., Samuel, F.H., Valtierra, S., Doty, H.W., (2008) Mater. Sci. Eng. A, 480, p. 356; Major, F., Apelian, D., (2003) AFS Aluminum Structural Casting Conference, , Orlando; Dwivedi, D.K., Sharma, R., Kumar, A., (2006) Int. J. Cast Metal. Res., 19, p. 275; Elzanaty, H., (2014) Impact. Int. J. Res. Eng. Tech., 2, p. 49; Wang, Y., Liao, H., Wu, Y., Yang, J., (2014) Mater. Des., 53, p. 634; Zamani, M., Seifeddine, S., Aziziderouei, M., (2013) TMS 2013 Annual Meeting and Exhibition, p. 297. , in, San Antonio, TX, United States; Zamani, M., Seifeddine, S., (2015) Light Met., 2015, p. 955; Shabestari, S.G., Moemeni, H., (2004) J. Mater. Process. Technol., 153-154, p. 193; Chauke, L., Möller, H., Curle, U.A., Govender, G., (2013) Mater. Sci. Forum, 765, p. 658; Juhl, A.D., (1999) DTU; Sjölander, E., Seifeddine, S., (2014) Metall. Mater. Trans. A, 45, p. 1916; Caceres, C.H., Davidson, C.J., Griffiths, J.R., Wang, Q.G., (1999) Metall. Mater. Trans. A, 30, p. 2611; Cáceres, C.H., Davidson, C.J., Griffiths, J.R., (1995) Mater. Sci. Eng. A, 197, p. 171; Davies, C.H.J., (1995) Key Eng. Mater., 104-107, p. 447; Yilmaz, F., Elliott, R., (1989) J. Mater. Sci., 24, p. 2065

Available from: 2016-12-22 Created: 2016-12-21 Last updated: 2016-12-22Bibliographically approved

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