【摘要】 研究了镁合金AZ3 1分别在无磁场及磁场作用条件下凝固的微观结构及合金元素的分布 ;对凝固过程中磁场的分布进行了数值模拟。结果表明 ,与无磁场处理凝固的镁合金组织比较 ,镁合金AZ3 1的凝固过程在磁场作用条件下合金元素在晶界上和晶内的分布有较大的变化 ,在较强静磁场作用下聚集在晶界上的共晶体组织明显减少 ,共晶组织形成的网络变得不连续 ,同时在晶内和晶界附近出现了大量近似球状的共晶质点 ,提高了合金元素在晶内的固溶度 ,有利于改善镁合金的综合性能更多还原

【Abstract】 The microstructure and distribution of alloy elements of magnesium alloy AZ31 were studied under magnetic field and without magnetic field during solidification. Meanwhile, distribution of electromagnetic field in the process of solidification was also given by numerical simulation. Experimental results show that distribution of alloy elements in the grain and at grain boundaries are greatly changed with magnetic fields while solidifying. Especially, when magnetostatic field is applied, eutectic structures aggregating at grain boundaries are evidently reduced, the net which is formed by eutectic structures becomes discontinuous, and besides, a great deal of dispersive and approximately spherical particles are formed in the grains and near grain boundaries. Therefore, the forming property of magnesium alloy is improved when magnesium alloy solidifies under magnetostatic field.更多还原