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Influence of Si and cooling rate on microstructure and mechanical properties of Al–Si–Mg cast alloys
Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.ORCID iD: 0000-0002-8098-4788
Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing - Surface technology.ORCID iD: 0000-0002-7095-1907
Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.ORCID iD: 0000-0001-6481-5530
Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.ORCID iD: 0000-0002-0101-0062
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 thepurpose of to develop high-strength cast aluminum alloys that are anodizable. The Si-content was 2.5, 3.5 and 5.5wt% Si, andboth Sr-modified and unmodified conditions were used. The samples were produced using the gradient solidification furnaceto generate awell-controlled microstructure. The resulting secondary dendrite armspacingwas 10 and 20μm. Themicrostructuralfeatures were evaluated by employing SEM/EDS and optical microscopy. Furthermore, computed tomography (CT) scan technologywas used to provide a 3D view of high-density phases in the microstructure. The mechanical properties of these alloys werestudied by means of tensile and hardness testing where the latter was performed on the macrolevel and microlevel. The resultsdemonstrate clearly how the Si growth in the microstructure is restricted by increased cooling rate and modification and its rolein strength development in Al-Si alloys. Additionally, the CT scan visualized the morphology of intermetallics and supported inidentifying the oxide layer growth as a result of the anodizing process.

Place, publisher, year, edition, pages
2016. Vol. 48, no 8, 861-869 p.
Keyword [en]
Al-Si alloys; microstructure; mechanical properties; hardness; anodizing
National Category
Manufacturing, Surface and Joining Technology Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:hj:diva-28024DOI: 10.1002/sia.5814Scopus ID: 2-s2.0-84940688989OAI: oai:DiVA.org:hj-28024DiVA: diva2:855858
Funder
Knowledge Foundation, 20100280
Available from: 2015-09-22 Created: 2015-09-22 Last updated: 2017-01-26

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Zhu, BaiweiLeisner, PeterSeifeddine, SalemJarfors, Anders E.W.
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Surface and Interface Analysis
Manufacturing, Surface and Joining TechnologyMetallurgy and Metallic Materials

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