About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
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Aluminum Alloys, Processing and Characterization
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Presentation Title |
Ternary Interactions and Implications for Third Element Alloying Potency in Al-Ce-Based Alloys |
Author(s) |
Hunter B. Henderson, David Weiss, Zachary Sims, Michael J. Thompson, Emily Moore, Aurélien Perron, Fanqiang Meng, Ryan Ott, Orlando Rios |
On-Site Speaker (Planned) |
Hunter B. Henderson |
Abstract Scope |
The recently developed class of Al-Ce-based alloys offer a number of beneficial attributes, including high temperature strength retention, resistance to microstructural coarsening, and excellent castability. Binary alloys around the eutectic composition of ~11 wt.% Ce contain a characteristic large volume fraction of eutectic Al11Ce3 lathes. However, further alloying additions to improve properties can stabilize a myriad of ternary Al-Ce-X phases that complicate alloying efficacy in unexpected ways, as intermetallic stability often changes between solidification and solutionizing temperatures. Unlike in many Al alloys that can be solution treated to a single phase, Al-Ce and Al-Ce-X intermetallics form during solidification and their morphology is largely retained during heat treatment, similarly to composite materials. This morphological stability remains even after stoichiometric changes. Here, we present design principles for Al-Ce-based alloys, especially with Si, Cu, and Mg additions. Changes to alloying element strengthening potency, empirical models, and integration with CALPHAD databases will be discussed. |
Proceedings Inclusion? |
Planned: Light Metals |