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The effect of SI co...
The effect of SI content on microstructure and mechanical properties of Al-Si alloy
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- Bogdanoff, Toni (författare)
- Jönköping University,JTH, Material och tillverkning
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- Seifeddine, Salem (författare)
- Jönköping University,JTH. Forskningsmiljö Material och tillverkning – Gjutning
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- Dahle, Arne K. (författare)
- Jönköping University,JTH. Forskningsmiljö Material och tillverkning – Gjutning
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(creator_code:org_t)
- Milano : Associazione Italiana di Metallurgia, 2016
- 2016
- Engelska.
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Ingår i: La Metallurgia Italiana. - Milano : Associazione Italiana di Metallurgia. - 0026-0843. ; 108:6
- Relaterad länk:
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Metallurgi och metalliska material (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Metallurgy and Metallic Materials (hsv//eng)
Nyckelord
- Al-Si alloy
- Fracture mechanism
- Mechanical Properties
- Dendritic eutectic growth
- Microstructure
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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