About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
|
Symposium
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Additive Manufacturing of Metals: Microstructure, Properties and Alloy Development
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Presentation Title |
Characterization of Near-eutectic Al-Ce with Sc and Zr Microadditions Processed by Rapid Laser Remelting |
Author(s) |
Jovid Rakhmonov, Clement Ekaputra, David Weiss, David Dunand |
On-Site Speaker (Planned) |
Jovid Rakhmonov |
Abstract Scope |
The creep resistance of additively-manufactured near-eutectic Al-Ce alloys can be substantially improved by microadditions of Sc and Zr to form thermally-stable, L12-type nanoprecipitates in the α-Al phase upon subsequent aging. In this study, an Al-Ce-Sc-Zr alloy is first produced by conventional casting, then subjected to laser remelting to mimic the high cooling rates offered by powder-bed laser fusion. The as-cast and laser-remelted alloys are then aged to induce the precipitation of L12-type Al3(Sc,Zr) nanoprecipitates. Microstructure and property evolutions following laser remelting and subsequent aging are investigated using SEM, TEM and hardness testing. The results are compared with those of the cast alloy subjected to the same aging heat treatment. Significant improvements in hardness upon aging of the laser-remelted alloy are explained by the combination of a fine eutectic microstructure and high number density of L12-type nanoprecipitates. |