Microstructure and mechanical properties of AZ31 alloy ingot fabricated by semi-continuous casting
来源期刊：中南大学学报(英文版)2014年第8期
论文作者：LI Jin-zhu(李金柱) NONG Deng(农登) ZHENG Kai-hong(郑开宏) LI Xiao-hui(黎小辉) ZHAO Ming-chun(赵明纯)
文章页码：2984 - 2990
Key words：semi-continuous casting method; microstructure; mechanical properties; fine grain strengthening
Abstract: The AZ31 alloy ingot with diameter of 110 mm and length of 3500 mm was fabricated successfully. The compositions and microstructure morphologies of the ingot at different locations were performed, which indicated that the chemical composition distributed homogeneously through the whole alloy ingot and the average grain size increased from the surface to the center. The results of the EDS and element face-scanning illustrated that the eutectic compounds mainly consisted of β-Mg17Al12 and a small amount of β-Mg17(AlZn)12. Furthermore, slight improvements of the strength and ductility were observed from the center to the surface along the axial direction of the alloy ingot, while both the strength and elongation to failure of the samples along the radial direction are higher than that along the axial direction. The fine grain strengthening was the main contributors to the strength of the as-casted AZ31 alloy.
LI Jin-zhu(李金柱)1, 2, NONG Deng(农登)2, ZHENG Kai-hong(郑开宏)2, LI Xiao-hui(黎小辉)2, ZHAO Ming-chun(赵明纯)1
(1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Institute of Materials Processing, Guangzhou General Research Institute for Industrial Technology
(Guangzhou Research Institute of Non-ferrous Metals), Guangzhou 510650, China)
Abstract:The AZ31 alloy ingot with diameter of 110 mm and length of 3500 mm was fabricated successfully. The compositions and microstructure morphologies of the ingot at different locations were performed, which indicated that the chemical composition distributed homogeneously through the whole alloy ingot and the average grain size increased from the surface to the center. The results of the EDS and element face-scanning illustrated that the eutectic compounds mainly consisted of β-Mg17Al12 and a small amount of β-Mg17(AlZn)12. Furthermore, slight improvements of the strength and ductility were observed from the center to the surface along the axial direction of the alloy ingot, while both the strength and elongation to failure of the samples along the radial direction are higher than that along the axial direction. The fine grain strengthening was the main contributors to the strength of the as-casted AZ31 alloy.
Key words:semi-continuous casting method; microstructure; mechanical properties; fine grain strengthening
