Nd对AZ91镁合金显微组织和耐腐蚀性能的影响  

Effect of Nd Addition on Microstructure and Corrosion Resistance of AZ91 Magnesium Alloy

作　　者：王娜[1] 白朴存[1] 侯小虎[1] 郝永飞[1] 

机构地区：[1]内蒙古工业大学材料科学与工程学院,呼和浩特010051

出　　处：《材料研究学报》2011年第2期214-218,共5页Chinese Journal of Materials Research

基　　金：内蒙古自然科学基金2009MS0807;内蒙古攻关20091502资助项目~~

摘　　要：用金相显微镜、扫描电镜和静态质量损失法对AZ91-xNd镁合金(x=1.1%,1.4%,1.9%)的微观组织和腐蚀性能进行表征,研究了Nd对AZ91镁合金显微组织和耐腐蚀性能的影响。结果表明:稀土Nd的添加明显细化了合金的组织,使半连续网状β(Mg_(17)Al_(12))相变为细小的长条状,且分布更加均匀。在合金中还生成了颗粒状的Al_3Nd;稀土Nd显著提高了镁合金的耐腐蚀性能。添加1.4%Nd的镁合金耐腐蚀性能最佳,平均腐蚀速率为0.1708mg.cm^(-2)·d^(-1),为AZ91合金的20%。The microstructure and corrosion behavior of AZ91 magnesium alloys with Nd addition were characterized by optical microscopy,scanning electronic microscopy,and the static mass loss method,the effect of Nd addition on microstructure and corrosion resistance of AZ91 magnesium alloy was investigated.The results show that the trace addition of Nd refines the microstructure of AZ91.The semi-continuous reticularβ（Mg17Al12） is gradually becoming the thin strip,and the distribution is more uniform.There are granular Al_3Nd phase formed.And rare earth Nd significantly impwroved the resistance corrosion of AZ91 magnesium alloy.The alloy with 1.4%Nd has the best corrosion resistance,and the corrosion rate is 0.1708 mg.cm^-2·d^-1,only 20%of that of common AZ91 alloy.

关 键 词：材料失效与保护 镁合金 ND 显微组织 腐蚀性能 

分 类 号：TG172[金属学及工艺—金属表面处理]