Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 490, Issue 1-2, Pages 695-699Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2009.10.141
Keywords
Magnesium alloys; Casting; Carbonate; Grain refinement; Heterogeneous nucleation; Electron probe microanalysis
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Funding
- R&D Program of Korea Institute of Materials Science
- 21st Century Frontier RD Program
- Ministry of Knowledge Economy, Republic of Korea
- National Research Council of Science & Technology (NST), Republic of Korea [PNK2130] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The effect of MnCO(3) addition on grain refinement of Mg-Al alloys was investigated. The microstructural changes induced by MnCO(3) addition indicate that it has excellent grain refining efficiency for Mg-9 wt.%Al alloy. In addition the average grain size was reduced from 480 to 61 mu m by 0.6 wt.% addition. This is attributed to inoculation of MnCO(3), which brings about the formation of potent heterogeneous nucleants such as MgO, Al(4)C(3), and Al(8)Mn(5) before solidification of alpha-Mg as well as melt agitation by the release of CO(2) gas. (C) 2009 Elsevier B.V. All rights reserved.
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