Year: 2026
Type: article
Abstract: In this investigation, microalloying additions of Mn, Cr, Sr, and Ce were used to modify and refine detrimental intermetallic phases formed in secondary alloys with high Fe content. Three secondary Al-Si-based alloys were designed based on Fe content (0.5–0.6 wt.%) in the twitch scrap and die cast alongside the primary C611 alloy (0.1 wt.% Fe). The results suggest the addition of Mn and/or Cr can effectively suppress the formation of detrimental β-AlFeSi phase, with predominantly α-Al(Fe,Mn)Si in the die-cast microstructure of the secondary alloys. Sr additions (30–40 ppm) refined the eutectic silicon, and a small Ce addition (0.15 wt.%) led to the formation of Ce-intermetallics that functioned as sinks for Cu and Mg. Average elongations between 7 and 9% were achieved in as-cast conditions for three secondary alloys while exhibiting improvements in strength over the primary C611 alloy. A T7 treatment further improved the mechanical properties (up to 220 MPa ultimate tensile strength and 13% elongation).
Institution: The Ohio State University
Language: English
Subfield: Aerospace Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,290
Awards: SMIA REMADE INSTITUTE, G623495353
OpenAlex ID: W7160821163