铒对Mg_2Si/AM60镁基复合材料力学性能及耐蚀性能的影响  

Effect of Er on mechanical property and corrosion resistance of Mg_2Si/AM60 magnesium matrix composites

作　　者：闫洪[1] 吴庆捷[1] 黄昕[1] 

机构地区：[1]南昌大学先进成形研究所,南昌330031

出　　处：《塑性工程学报》2011年第5期110-115,共6页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(51165032);江西省高等学校科技创新团队资助项目(00008713);江西省教育厅资助项目(GJJ11269)

摘　　要：利用金相显微镜、扫描电镜、能谱分析、X射线衍射分析、失重法和电化学测试等手段,研究不同含量的稀土铒对Mg2Si/AM60镁合金复合材料显微组织和腐蚀行为的影响。结果表明,添加稀土Er可使复合材料中增强相由树枝状转变为颗粒状,其抗拉强度由190.1MPa提高到208.3MPa,同时使腐蚀速率大大下降;当稀土Er质量分数为0.7%时,复合材料自腐蚀电位提高了214mV,自腐蚀电流密度降低了一个数量级。说明稀土Er能有效提高合金的耐腐蚀性能。The effect of Er on microstructure and corrosion resistance of Mg2Si/AM60 magnesium matrix composites was studied by optical microscopy,scanning electronic microscopy,energy-dispersive spectroscopy,X-ray analysis,weight loss measurement and electrochemical testing.The results show that,Er can change morphology of the reinforcement,which changes dendrite into particle.The tensile strength increase 190.1MPa to 208.3MPa.The corrosion rate of the magnesium matrix composites decrease greatly with the addition of Er.With addition of 0.7wt% Er,the corrosion potential of the magnesium matrix composites increase by 214mV and the corrosion current density decrease by 1 order of magnitude.It shows that Er can effectively improve the corrosion resistance of the matrix composites.

关 键 词：铒 Mg2Si/AM60 镁合金复合材料 力学性能 耐腐蚀性能 

分 类 号：TB331[一般工业技术—材料科学与工程]