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Microstructures and mechanical properties of Mg–Al–Zn–Ca alloys fabricated by high frequency electromagnetic casting method |
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| Authors: | J P Park M G Kim U S Yoon W J Kim |
| Affiliation: | (1) Research Institute of Science & Technology, P.O. Box 135, Pohang, 790-600, Republic of Korea;(2) Jeonnam Techno-Park, 11 Block, Yulchon Industrial Complex, Suncheon, Jeonnam, 540-856, Republic of Korea;(3) Department of Materials Science and Engineering, Hong-Ik University, 72-1, Sangsu-dong, Mapo-gu, Seoul, 121-791, Republic of Korea |
| Abstract: | The microstructures and mechanical properties of AZ31 and 1 wt%Ca-containing AZ31 billets fabricated using EMC (Electromagnetic Casting) and EMS (Electromagnetic Stirring) were examined. The results show a great potential of producing high-quality surface magnesium billets with fine-grained microstructure at a relatively high casting speed. Application of EMC + EMS for production of the 1 wt%Ca-AZ31 alloy billet with a diameter of 150 mm produced a reasonably homogeneous microstructure composed of fine grains with an average size of 45 μm. Attainment of the fine-grained and homogeneous microstructure by EMC + EMS was attributed to reduction of temperature gradient and fragmentation of dendrite structure under electromagnetic force. Strength of the EMC and EMC + EMS 1 wt%Ca-AZ31 billets was higher than that of the EMC AZ31 billet due to the grain size and particle strengthening effects. |
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