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Erschienen in: Metallurgical and Materials Transactions A 13/2010

01.12.2010

Understanding the Co-Poisoning Effect of Zr and Ti on the Grain Refinement of Cast Aluminum Alloys

verfasst von: D. Qiu, J.A. Taylor, M.-X. Zhang

Erschienen in: Metallurgical and Materials Transactions A | Ausgabe 13/2010

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Abstract

The “co-poisoning” effect between Zr and Ti (derived from Al-Zr and Al-Ti-B master alloy additions) on the grain refinement of cast aluminum alloys is studied from a crystallographic atom matching viewpoint. The edge-to-edge matching (E2EM) model has been used to investigate the possible “poisoning” phase containing Zr/Ti, Al, and Fe in commercial grade aluminum alloys. The results show that Al3Ti is the most likely constituent to be poisoned due to the formation of an Al8Fe4Zr coating on its surface, since the Al8Fe4Zr phase has good crystallographic atom matching with Al3Ti, but not with the aluminum matrix. Meanwhile, the partial dissolution of Al3Zr nucleant particles to compensate for the loss of solute Zr aggravates the poisoning phenomenon. This proposed mechanism is consistent with most previous experimental observations and with existing practical solutions employed in the foundry.

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Metadaten
Titel
Understanding the Co-Poisoning Effect of Zr and Ti on the Grain Refinement of Cast Aluminum Alloys
verfasst von
D. Qiu
J.A. Taylor
M.-X. Zhang
Publikationsdatum
01.12.2010
Verlag
Springer US
Erschienen in
Metallurgical and Materials Transactions A / Ausgabe 13/2010
Print ISSN: 1073-5623
Elektronische ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-010-0404-2

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