不同深冷处理时间对AZ31镁合金组织及性能的影响  

Effect of Different time of Cryogenic Treatment on Microstructure and Properties of AZ31 Magnesium Alloy

作　　者：易定国[1] 王向杰[2] 

机构地区：[1]湖北理工学院体育部,湖北黄石435003 [2]湖北理工学院机电工程学院,湖北黄石435003

出　　处：《热加工工艺》2016年第20期211-213,217,共4页Hot Working Technology

基　　金：湖北省教育厅资助项目(B2014032)

摘　　要：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 cryogenic treatment of as-cast AZ31 magnesium alloy at different time was carried out under the same solid solution and aging conditions. The effects of different cryogenic time on the microstructure, corrosion resistant and abrasion resistance were analyzed by the metallographic analysis, the polarization corrosion and the friction test. The results show that, during the cryogenic treatment at different time, the grain size, the number of second phase, the corrosion resistance and wear resistance of AZ31 magnesium alloy have big difference. When the cryogenic treatment time is lh, the grains in matrix are coarse, and the number of second phase is less. With cryogenic treatment time extending,the grains in matrix are refined, and the number of second phase increases gradually. Meanwhile, properties of the corrosion resistance and the wear resistance increase gradually. When the time of cryogenic treatment reaches 12 h, the grain size is obviously refined, the number of second phase is the maximum, and the properties of the corrosion resistance and the wear resistance are the best.

关 键 词：AZ31 镁合金 深冷处理 组织 性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]