|About this Abstract
||Materials Science & Technology 2017
||Rare Earth Metals, Compounds, and Alloys: Synthesis, Processing, Emerging Applications, Recent Advances, Future Challenges
||New Aluminum Alloys Based on Common Rare Earth Additives
||David Weiss, Orlando Rios
|On-Site Speaker (Planned)
Aluminum alloys containing cerium in near eutectic compositions have demonstrated high mechanical properties at temperatures over 250C. These alloys, which can contain magnesium, silicon, nickel or iron as secondary alloying elements, are suitable for all casting processes including high pressure diecasting, squeeze casting, permanent mold and sand casting. The alloys can be used in similar formulations for forging and extrusion. The Al-Ce alloy system can be used as a common template for wide-ranging alloy development, similar to the Al-Si system. The Al-Ce forms an intermetallic that is stable up to the melting point of the alloy. The near zero solubility of Ce in aluminum limits diffusion and Ostwald ripening. At cooling rates that are typical of some casting processes, the intermetallic formed is on the scale of 100-200 nanometers contributing to effective dispersion strengthening. This paper discusses the strengthening mechanisms, properties and applications of the Al-Ce-Mg alloy system.