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Synergistic refining mechanism of Mg-3%Al alloy refining by carbon inoculation combining with Ca addition
- Source :
- Journal of Magnesium and Alloys, Vol 8, Iss 4, Pp 1090-1101 (2020)
- Publication Year :
- 2020
- Publisher :
- KeAi Communications Co., Ltd., 2020.
-
Abstract
- Mg-3%Al alloy was refined by carbon inoculation combining with 0.2%Ca addition. High grain refining efficiency was obtained and the synergistic refining mechanism was deeply discussed in the present study. Al–C–O particles, actually Al4C3 particles, were formed in the carbon-inoculated Mg-3%Al alloy acting as nuclei for α-Mg grains. Ca addition had no obvious effect on size distribution of the nucleating particles. Ca segregation was proved on Al4C3 particles, which should reduce the interfacial energy of nuclei/Mg. The constitutional undercooling in front of nucleus/liquid was increased from 0.12 °C to 0.15 °C induced by 0.2%Ca addition. The synergistic grain refining efficiency can be attributed to the higher constitutional undercooling and lower the interface energy of nucleus/Mg induced by Ca addition. More nucleating particles with small size could be activated acting as potent nuclei of α-Mg grains. Consequently, Mg-3%Al alloy could be effectively refined due to the synergistic effect induced by carbon inoculation combining with Ca.
Details
- Language :
- English
- ISSN :
- 22139567
- Volume :
- 8
- Issue :
- 4
- Database :
- Directory of Open Access Journals
- Journal :
- Journal of Magnesium and Alloys
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.623857c9811d4e0cbe80d8e2aea01efd
- Document Type :
- article
- Full Text :
- https://doi.org/10.1016/j.jma.2019.12.007