论文部分内容阅读
在相同的固溶和时效条件下对铸态AZ31镁合金进行了不同时间的深冷处理。通过金相显微分析、极化腐蚀以及摩擦试验分析了不同深冷时间对显微组织、耐腐蚀性以及耐磨性的影响。结果表明:在不同时间深冷处理时,AZ31镁合金的晶粒尺寸、第二相数量、耐腐蚀性以及耐磨性具有较大差异。当深冷处理时间为1 h时,基体晶粒粗大,第二相的数量较少;随着深冷处理时间延长,基体晶粒发生细化,第二相数量逐渐增多,同时耐腐蚀性能以及耐磨性能逐渐提高;当深冷处理时间达到12 h时,晶粒发生明显的细化,第二相数量最多,且耐腐蚀性能以及耐摩擦性能最高。
The as-cast AZ31 magnesium alloy was cryogenically treated at different times under the same solution and aging conditions. The effects of different cryogenic time on microstructure, corrosion resistance and wear resistance were analyzed by metallographic analysis, polarization corrosion and friction tests. The results show that the grain size, the number of second phase, the corrosion resistance and the wear resistance of AZ31 magnesium alloy have great differences when cryogenic treatment is carried out at different time. When the cryogenic treatment time is 1 h, the matrix grains are coarse and the number of the second phase is small. With the prolonging of the cryogenic treatment time, the grains of the matrix refinement and the number of the second phase gradually increases, while the corrosion resistance and abrasion resistance The performance is gradually improved; when the cryogenic treatment time reaches 12 h, the grain refinement occurs obviously, the second phase is the most, and the corrosion resistance and friction resistance are the highest.