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研究了时效处理时间对SiC/AZ81镁基复合材料显微结构和性能的影响。结果表明,随着时效时间的延长,SiC/AZ81镁基复合材料中β-Mg_(17)Al_(12)析出相数量先增多后减少,析出相尺寸先减小后增大;不同时效处理时间下SiC/AZ81镁合金基复合材料中均无其他新相生成;复合材料的压缩屈服强度先增大后减小,当时效时间为20 h时,复合材料的压缩屈服强度达到最大值,为182.1 MPa;SiC/AZ81镁合金基复合材料的磨损率先增大后减小,当时效时间为16 h时,SiC/AZ81镁合金基复合材料具有最高的磨损率。因此,最佳时效时间为16 h。
The effects of aging treatment time on the microstructure and properties of SiC / AZ81 magnesium matrix composites were studied. The results show that with the aging time increasing, the amount of β-Mg_ (17) Al_ (12) precipitates in SiC / AZ81 magnesium matrix composites increases first and then decreases, and the size of precipitates first decreases and then increases. Under the SiC / AZ81 magnesium alloy matrix composites, no other new phase was formed. The compressive yield strength of the composites first increased and then decreased. When the aging time was 20 h, the compressive yield strength of the composites reached the maximum value of 182.1 MPa. The wear rate of SiC / AZ81 magnesium alloy matrix composites firstly increases and then decreases. When the aging time is 16 h, the wear rate of SiC / AZ81 magnesium matrix composites has the highest wear rate. Therefore, the best aging time is 16 h.