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Meeting MS&T23: Materials Science & Technology
Symposium Recent Developments in Light-Weight Composites and Materials
Presentation Title Effect of Aging on the Strength and Failure Mechanisms of an Aluminum-Cerium Based Alloy
Author(s) Opemipo Adetan, Dinc Erdeniz
On-Site Speaker (Planned) Opemipo Adetan
Abstract Scope Aluminum-cerium alloys are of interest to the aluminum alloy community due to their excellent microstructural stability at elevated temperatures and the ability to be strengthened via the formation of the intermetallic Al11Ce3 during eutectic solidification. The addition of erbium, scandium, and zirconium has further improved the mechanical properties of these alloys. This study focuses on the thermo-mechanical stability of an Al-Ce-Er-Sc-Zr alloy, developed with the aid of CALPHAD modeling. Additional strengthening is provided by L12-ordered Al3(Er, Sc, Zr) precipitates formed during a custom peak-aging heat treatment procedure. Quasi-static mechanical tensile tests are conducted at room temperature and several elevated temperatures up to 400°C to determine the temperature dependency of the alloy strength. Fractographic analysis is carried out to identify the dominant failure mechanisms. The results will provide insights into the underlying mechanisms of mechanical failure which are relevant for the development of high-strength aluminum alloys for elevated-temperature applications.


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