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新型微合金化镁合金的显微组织和耐腐蚀性能
Microstructure and Corrosion Resistance of a New Microalloying Magnesium Alloy
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- DOI:
- 作者:
- 李思琪1，王乐闻1，姚 远1，李 美1，贾 征1，付 丽1，2
LI Siqi1, WANG Lewen1, YAO Yuan1, LI Mei1, JIA Zheng1, FU Li1,2
- 作者单位:
- 1. 沈阳大学机械工程学院，辽宁沈阳110044；2.东北大学材料电磁过程研究教育部重点实验室，辽宁沈阳110919
1. College of Mechanical Engineering, Shenyang University, Shenyang 110044, China; 2. Key Lab of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110919, China
- 关键词:
- 镁合金；微合金化；耐腐蚀性能；Al11 Sm3相
magnesium alloy; microalloying; corrosion resistance; Al11 Sm3 phase
- 摘要:
- 镁合金因自身耐腐蚀性能较差限制了其在工业领域的应用，微合金化是改善镁合金耐腐蚀性能的一种经 济高效的手段。 采用微合金化的方法制备新型镁合金Mg-0.5Zn-0.4Mn-0.4Sm-0.4Al(合金 A)和 Mg-0.5Zn-0.4Mn-0.4Sm-1.2Al(合金 B)，借助扫描电镜(SEM)、能谱仪(EDS)、失重和析氢实验研究了新型合金的显微组织及耐腐蚀性能。 结果表 明，合金A和B的显微组织均由α-Mg基体、颗粒状Mg41 Sm5相和树枝状Al11 Sm3相组成，其中Al11 Sm3相沿晶界富集， Mg41 Sm5 相弥散分布在晶粒内部。 与合金A相比，合金B中Al11 Sm3相的数量较多，晶粒尺寸较小，耐腐蚀性能更好。The industrial application of magnesium alloys is limited by poor corrosion resistance, and microalloying is a crucial method for the cost-effective enhancement of this property. This study developed new magnesium alloys, Mg-0.5Zn-0.4Mn-0.4Sm-0.4Al (alloy A) and Mg-0.5Zn-0.4Mn-0.4Sm-1.2Al (alloy B), by microalloying techniques. The microstructures and corrosion resistance of these new alloys were investigated through scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), weight loss, and hydrogen evolution experiments. The results indicated that both alloys consisted of an α-Mg matrix, a granular Mg41 Sm5 phase, and a dendritic Al11 Sm3 phase. The Al11 Sm3 phase is enriched along the grain boundaries, whereas the Mg41 Sm5 phase is dispersed within the grains. Compared with alloy A, alloy B has a greater quantity of the Al11 Sm3 phase, a smaller grain size, and improved corrosion resistance.