Journal
MATERIALS LETTERS
Volume 161, Issue -, Pages 340-342Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2015.08.108
Keywords
Metals and alloys; Cast; Scandium; Microstructure; Al3Sc
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The Jominy end quench test has been adopted to investigate the effect of trace scandium on the quench sensitivity of Al-7Si-0.6 Mg alloys. The results show that at a lower quenching rate, the preferred precipitation of the Al3Sc phase inhibits the formation of a beta'-Mg2Si phase, promoting the nucleation of finely dispersed metastable Mg2Si precipitates in the subsequent aging treatment. The quench sensitivity of the Al-7Si-0.6 Mg alloy was effectively improved by more than 60%. Rapid quenching rates can cause the Al matrix of the alloy to be in a supersaturated state, resulting in enhanced mechanical properties after aging treatment. In contrast, slow quenching rates precipitate the relatively coarse beta'-Mg2Si phase and also produce a precipitate free zone during the quenching process, thereby diminishing the mechanical properties of the alloy after the aging treatment, so that the Al-7Si-0.6 Mg alloy possesses higher quench sensitivity. (C) 2015 Elsevier B.V. All rights reserved.
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