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Metals 2018, 8(9), 701;

Removal of Tramp Elements within 7075 Alloy by Super-Gravity Aided Rheorefining Method

State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Xueyuan Road No. 30, Haidian District, Beijing 100083, China
Author to whom correspondence should be addressed.
Received: 15 July 2018 / Revised: 24 August 2018 / Accepted: 3 September 2018 / Published: 6 September 2018
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An investigation was made on the super-gravity aided rheorefining process of recycled 7075 aluminum alloy in order to remove tramp elements. The separation temperatures in this study were selected as 609 °C, 617 °C and 625 °C. And the gravity coefficients were set as 400 G, 700 G, 1000 G. The finely distributed impurity inclusions will aggregate to the grain boundaries of Al-enriched phase during heat treatment. In the field of super-gravity, the liquid phase composed of tramp elements Zn, Cu, Mg et al. will flow through the gaps between solid Al-enriched grains and form into filtrate. Both the weight of filtrate and removal ratio of tramp element improved with the increase of gravity coefficient. The total removal ratio of tramp element decreased with the fall of temperature due to the flowability deterioration of liquid phase. The time for effective separation of liquid/solid phases with super-gravity can be restricted within 1 min. View Full-Text
Keywords: super-gravity; rheorefining; aluminum alloy; tramp element; separation super-gravity; rheorefining; aluminum alloy; tramp element; separation

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Guo, L.; Wen, X.; Bao, Q.; Guo, Z. Removal of Tramp Elements within 7075 Alloy by Super-Gravity Aided Rheorefining Method. Metals 2018, 8, 701.

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