Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 496, Issue 1-2, Pages 218-225Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2010.03.002
Keywords
AZ91D alloy; Grain refinement; SiC particle; Refining mechanism; Al4C3 particle
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Funding
- National Basic Research Program of China [G2007CB613706]
- Lanzhou University of Technology
- Opening Foundation of Key Laboratory of Gansu Advanced Non-ferrous Materials
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AZ91D magnesium alloy has been grain-refined by SiC particles. The effects of grain-refining parameters on its grain size have been investigated. Simultaneously, the corresponding refining mechanism has also been discussed. The results indicate that the SiC particle is an effective grain refiner for AZ91D alloy and can decrease the grain size from 311 mu m of the not refined alloy to 71 mu m under an optimized refining technology. The added SiC particles cannot directly act as the nucleation sites of alpha-Mg crystals and the Al4C3 particles formed from the reaction between the SiC particles and the molten alloy are the actual nucleation sites. (C) 2010 Elsevier B.V. All rights reserved.
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