Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 509, Issue 1, Pages 57-60Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2010.09.046
Keywords
Aluminum alloys; Intermetallics; Nucleation; Grain refinement; Cavitation; Ultrasound
Categories
Funding
- Materials Innovation Institute [MC4.05215]
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In high-strength aluminum alloys Ti and Zr are commonly present as alloying elements, mostly as anti-recrystallization agents. Grain refinement during solidification is also achieved using Ti but in the form of titanium borides. Our previous investigations showed that a combined addition of Zr and Ti enables considerable grain refinement in aluminum alloys upon cavitation treatment, much stronger than that of Zr alone. The role of titanium and ultrasonic processing remained unclear. In this paper we propose a mechanism of the grain refinement that includes structural changes in solidification sites, their refinement and initiation of heterogeneous nucleation at lower undercooling. (C) 2010 Elsevier B.V. All rights reserved.
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