Effect of Al on the Thermal Shrinkage Behavior of Hypoeutectic Mg-Al Alloys
MENG Yi1, YANG Yue1, CAO Leigang1, SUN Jian1, ZHANG Haitao2, CUI Jianzhong2
1 School of Mechanical and Materials Engineering, North China University of Technology, Beijing 100144; 2 Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819
Abstract: The cooling curves and the various of shrinkage in the process of solidification and cooling were tested by using a self-made device which could achieve the one-dimensional shrinkage instead of 3D shrinkage of the casting. Then, the effects of Al content (0wt%,1.1wt%,3wt%,5wt%) on the thermal shrinkage of the binary Mg-Al as-cast alloys were obtained. And their mean linear expansion coefficients at low temperature range were got as well. As a result, the characterization of the thermal shrinkage behaviors of these hypoeutectic Mg-Al as-cast alloys was systematically investigated. The results indicated that the contract rate of the Mg-Al casting ascends at first and descends later with the temperature dropping after casting. Maximum shrinkage rate of molten (vl, max) decreased with the increase of Al content (0%—5%) during solidification, but the decreasing range was weakened. Within a high temperature range of each alloy after solidification, the corresponding shrinkage rates would increase firstly and then decreased with the cooling temperature dropping. While, the linear shrinkage rates during low temperature shrinkage stage tended to be a constant at last for all tested materials. The average linear expansion coefficients of the alloys at the low temperatures (<400 ℃) increased with the increase of Al content (0%—5%).
蒙毅, 杨越, 曹雷刚, 孙健, 张海涛, 崔建忠. Al含量对Mg-Al亚共晶合金热收缩行为的影响[J]. 材料导报, 2018, 32(18): 3185-3189.
MENG Yi, YANG Yue, CAO Leigang, SUN Jian, ZHANG Haitao, CUI Jianzhong. Effect of Al on the Thermal Shrinkage Behavior of Hypoeutectic Mg-Al Alloys. Materials Reports, 2018, 32(18): 3185-3189.
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2018, Vol. 32 
