The effects of electromagnetic stirring and Al4C3 grain refiner on the grain refinement of semicontinuously cast AZ31 magnesium alloy were discussed in this investigation. The results indicate that electromagnetic stirring has an effective refining effect on the grain size of AZ31 magnesium alloy under the effect of Al4C3 grain refiner. Electromagnetic stirring can `activatea€? the Al4C3 particles, resulting in more heterogeneous nucleation sites for the primary e???-Mg grains. But, longer holding time can `deactivatea€? the Al4C3 particles and poison the grain refining effect.
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机译：研究了电磁搅拌和Al 4 C 3 晶粒细化剂对半连续铸造AZ31镁合金晶粒细化的影响。结果表明，在Al 4 C 3 晶粒细化剂的作用下，电磁搅拌对AZ31镁合金的晶粒尺寸具有有效的细化作用。电磁搅拌可以激活吗？ Al 4 C 3 颗粒，导致初级e ???-Mg晶粒的异质形核位点更多。但是，更长的保存时间可以“取消激活”吗？ Al 4 C 3 颗粒会破坏晶粒细化效果。
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