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Meeting 2017 TMS Annual Meeting & Exhibition
Symposium The Science of Melt Refining: An LMD Symposium in Honor of Christian Simensen and Thorvald Abel Engh
Presentation Title Effects of 2 ppm Beryllium on the Oxidation of a 5XXX Aluminum Alloy at Temperatures between 500 C and 750 C
Author(s) Nicholas Smith, Gabriella Tranell, Anne Kvithyld, Brian Gleeson
On-Site Speaker (Planned) Nicholas Smith
Abstract Scope The oxidation of molten aluminum has been thoroughly studied, and it is established empirically that beryllium has an inhibiting effect on the oxidation behavior. The aim of this work was to increase the fundamental understanding of this inhibiting effect. Two 5XXX aluminum alloys (4.7% Mg), one with 2ppm of beryllium and one without beryllium, were oxidized in a tube furnace under a dry air atmosphere.Samples were oxidized at temperatures from 500 C to 750 C for 10, 30 and 120 minutes. The composition and morphology of the oxide layers were examined with FIB and EDS, revealing the differences between the samples. The results showed up to a tenfold reduction in mass gain in samples containing beryllium.Significant differences in the oxide layer morphology were found for the two alloys at all times, including from 10 minutes. Thus, beryllium plays a significant role from the onset of high temperature oxidation.
Proceedings Inclusion? Planned: Light Metals


A Holistic Approach to Molten Metal Cleanliness
Developments in Inclusion Removal Technology
Effects of 2 ppm Beryllium on the Oxidation of a 5XXX Aluminum Alloy at Temperatures between 500 C and 750 C
Modelling of Hydrogen Removal in Gas Fluxing of Molten Aluminium
Overview of Ultrasonic Degassing Development
Oxide Skin Strength on Molten AA5XXX Aluminum Alloy – Effect of Beryllium and Alternatives
Results of Trials with a Multi Stage Filtration System Employing a Cyclone
The Contributions of Thorvald Engh and Christian Simensen to the Science of Melt Refining
The Fundamentals of Forming Microbubbles in Liquid Metal Systems
The Use of Nitrogen to Degas Molten Aluminium - Comparison of Metallurgical Results with Argon and Nitrogen Used in an ACD™
Understanding of Interactions between Pyrolysis Gases and Liquid Aluminum and Their Impact on Dross Formation

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