Effect of SiC Inoculant on the As-Cast Microstructure of Mg-1.0Mn Alloy [SiC 孕育剂对 Mg-1.0Mn 合金铸态组织的影响]

作者：Lai C.-M.^*; Yang L.; Tan H.-L.; Meng S.-M.

来源：Foundry, 2022, 71(8): 978-984.

• grain refinement
• heterogeneous nucleation
• magnesium alloy
• SiC

The effects of SiC particle addition amount, particle size and addition temperature on the grain refinement effect of as cast microstructure of Mg-1.0Mn alloy were studied by means of OM, SEM and EDS, and the corresponding grain refinement mechanism was analyzed combining Scheil solidification model based on solute redistribution correction. The results showed that the average grain size of as-cast microstructure become uniform and fine with the increase of the SiC content, particle size and addition temperature. The added SiC particles cannot directly act as the nucleation site of α-Mg base phase grain, but reacts with Mn to form Mn3Si particles which can become the core of heterogeneous nucleation. Therefore, the addition amount of SiC must be consistent with the content of the Mn. Under the experimental conditions, the best process combination was 0.5% SiC particles with a diameter of about 2 μm adding at 760 ℃.

• 单位
  南昌航空大学; 中南大学