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Al-Si-Cu alloys for high pressure die casting: Influence of Fe, Mn, and Cr on room temperaturemechanical properties
University of Bologna, Italy.
University of Bologna, Italy.
University of Bologna, Italy.
University of Bologna, Italy.
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2016 (English)In: La Metallurgia Italiana, ISSN 0026-0843, no 6, 77-80 p.Article in journal (Refereed) Published
Abstract [en]

Al-Si-Cu alloys with high Fe content are widely employed in high pressure die casting (HPDC). Even if Feis usually considered an impurity in secondary aluminum alloys, leading to the formation of harmfulintermetallic compounds, it helps in mitigating or eliminating the problem of die soldering. As a result,secondary Al alloys with Fe content of about 1 wt% are commonly employed for the production of HPDCcastings. Aiming to change the morphology of harmful Fe-bearing phases towards less detrimentalmorphologies, proper alloying elements may be added to the alloys. Mn and Cr (both present in thealuminum scrap), as instance, are reported to prevent from the formation of the acicular β-Al5FeSi phase,leading to the formation of more compact and polygonal intermetallics. Such phases are usually referredto as “sludge” particles. The influence of sludge particles on mechanical properties of Al -Si-Cu castings isstill under investigation. The present work aims at evaluating the effect of impurities (Fe, Mn and Cr)typically present in secondary Al alloys on the microstructure and mechanical properties of the A380 (Al -Si-Cu) alloy. Samples with different Fe, Mn and Cr content were produced and processed through adirectional solidification equipment to obtain specimens with controlled SDAS (~10 μm). Hardness androtating bending fatigue tests were carried out at room temperature. Mechanical properties of the alloyswere then related to the microstructure, analyzed by optical and scanning electron microscopy.

Place, publisher, year, edition, pages
Milano: Associazione Italiana di Metallurgia , 2016. no 6, 77-80 p.
Keyword [en]
High pressure die casting, HPDC, Al-Si-Cu alloys, sludge, fatigue, microstructure
National Category
Metallurgy and Metallic Materials
URN: urn:nbn:se:hj:diva-31423ScopusID: 2-s2.0-84993960856Local ID: JTHMaterialISOAI: diva2:954297
High Tech Die Casting 2016, Venice, 22-23 June, 2016.
Available from: 2016-08-22 Created: 2016-08-22 Last updated: 2017-01-09

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