交流磁场对AZ31镁合金凝固组织和压缩性能的影响

Effect of Alternating Magnetic Field on Solidified Structure and Compressive Performance of AZ31 Magnesium Alloy

对AZ31镁合金凝固过程施加交流磁场,研究不同的交流电压和模具温度对AZ31镁合金凝固组织和压缩性能的影响。结果表明：交流磁场可以有效细化AZ31镁合金的凝固组织;当模具温度一定,交流电压在0~250 V范围内增加,AZ31镁合金的初生枝晶形貌出现先细化后粗化的现象;当交流电压一定,模具温度在20~600℃范围内增加,合金的晶粒尺寸也先减小后增大。交流磁场明显提高合金的压缩性能,当浇注温度720℃,交流电压200 V,模具温度200℃时,合金的抗压强度为251.59 MPa,压缩率为28.78%,与未磁场处理的合金相比,抗压强度、压缩率分别提高了26.33%、34.98%。

The alternating magnetic field was applied during the solidification process of AZ31 magnesium alloy, and the effects of alternating voltage and mold temperature on the solidified structure and compressive properties of AZ31 magnesium alloy were investigated. The results show that the solidified structure of AZ31 alloy can be refined by alternating magnetic field. When the mold temperature is certain, with the increase of alternating voltage in the range of 0-250 V, the primary dendrite morphology refines firstly then coarsens. When the alternating voltage is certain, with the increase of the mold temperature in the range of 20-600 ℃, and the grain size of the alloy decreases firstly and then increases. Alternating magnetic field obviously improves the compressive performance of AZ31 alloy.When the pouring terperature is 720 ℃, the alternating voltage is 200 V, the mold temperature is 200℃, the compressive stress is 251.59 MPa, the compressibility is28.78%. Compared with the alloy without magnetic treatment, the compressive stress and compressibility of the alloy increase by 26.33% and 34.98% respectively.