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The effect of SI content on microstructure and mechanical properties of Al-Si alloy
Jönköping University, School of Engineering, JTH, Materials and Manufacturing.ORCID iD: 0000-0001-5753-4052
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.
2016 (English)In: La Metallurgia Italiana, ISSN 0026-0843, Vol. 108, no 6Article in journal (Refereed) Published
Abstract [en]

Al-Si alloys are the most popular casting alloys due to their excellent castability combined with high strengthto-weight ratio. This paper investigates the role of Si content in the range of 6.5 wt. % to 14.4 wt. % on the microstructure and mechanical properties of Al-Si-Mg casting alloys. All alloys were modified with 90-150 ppm Sr. No grain refiner was added. The samples were produced by directional solidification providing a microstructure that corresponds to microstructures found in die castings. From the phase diagram and coupled zone, increasing the Si level up to 14.4 wt. % is expected to start a competition between formation of α- dendrites and a fully eutectic microstructure. However, it is known that Sr-modification shifts the eutectic to higher Si contents. For the lower Si contents, the microstructure of the samples consisted of α-dendrites and a modified Al-Si eutectic. At 12.4 wt. % Si and above, a cellular eutectic microstructure was observed. No primary Si was observed even at 14.4 wt. % Si. The mechanical properties in terms of yield and tensile strength did not vary remarkably as a function of the Si level unlike the elongation to failure that dropped from 12 % at 6.5 wt. % Si to nearly 6 % at 14.4 wt. % Si; but still the material is exhibiting an elongation to failure that is far higher than normally expected.

Place, publisher, year, edition, pages
Milano: Associazione Italiana di Metallurgia , 2016. Vol. 108, no 6
Keyword [en]
Al-Si alloy, Fracture mechanism, Mechanical Properties, Dendritic eutectic growth, Microstructure
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:hj:diva-31156Scopus ID: 2-s2.0-85008867852OAI: oai:DiVA.org:hj-31156DiVA: diva2:950725
Available from: 2016-08-02 Created: 2016-08-02 Last updated: 2017-07-12Bibliographically approved

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Bogdanoff, ToniSeifeddine, SalemDahle, Arne K.
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