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OALib Journal期刊
ISSN: 2333-9721
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nd对az91镁合金显微组织和耐腐蚀性能的影响
Keywords: 材料失效与保护,镁合金,nd,显微组织,腐蚀性能
Abstract:
？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(mg17al12)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al3nd;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-2d-1,为az91合金的20%。
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