冷却方式对均匀化态Mg-6Gd-3Y-1Zn-0.5Zr镁合金显微组织及腐蚀性能影响研究  

Influence of cooling methods on microstructure and corrosion property of Mg-6Gd-3Y-1Zn-0.5Zr magnesium alloy

作　　者：鲁礼菊 许诗源[2] 刘木君 LU Liju XU Shiyuan LIU Mujun(AVIC Special Vehicle Research Institute/AVIC General Aircraft Research Institute, Zhuhai 519040, China College of Material Science and Engineering, Central South University, Changsha 410083, China)

机构地区：[1]中航工业特种飞行器研究所中航通飞研究院,广东珠海519040 [2]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《兵器材料科学与工程》2017年第2期13-16,共4页Ordnance Material Science and Engineering

摘　　要：通过XRD和扫描电镜对不同冷却方式(水淬、随炉冷)均匀化处理的Mg-6Gd-3Y-1Zn-0.5Zr镁合金的显微组织进行观察,并通过质量损失试验和电化学试验研究水淬及随炉冷样品在质量分数为5%Na Cl溶液中的腐蚀性能。结果表明:水淬样品主要由α-Mg固溶体和晶界上的块状长周期结构(LPSO)组成,而随炉冷样品除α-Mg固溶体和晶界上的块状LPSO外,晶内还分布着大量的片层状LPSO;晶内片层状的LPSO增加阴极相的数量,加速镁基体的腐蚀,故随炉冷样品在5%Na Cl水溶液中的质量损失速度大于水淬样品。The microstructure of Mg-6Gd-3Y-1Zn-0.5Zr alloys treated by different cooling methods（water quenching and furnace cooling） was observed by XRD and SEM,and the corrosion property was investigated by weight loss experiment and electrochemical experiment. The results indicate that the microstructure of water quenched samples consists of α-Mg and blocklike long period stacking ordered structure（LPSO）on grain boundary. The samples with furnace cooling contain lamellar LPSO in grain besides α-Mg and block-like LPSO. The lamellar LPSO in crease the quantity of cathodes,accelerate the corrosion of Mg matrix,so the weight loss rate in 5%（mass fraction）Na Cl aqueous solution of samples with furnace cooling is higher than that with water quenching.

关 键 词：Mg-Gd-Y-Zn-Zr LPSO 腐蚀 

分 类 号：TG166.4[金属学及工艺—热处理] TG178[金属学及工艺—金属学]