Improved Interfacial Bonding in Magnesium/Aluminum Overcasting Systems by Aluminum Surface Treatments
Improved Interfacial Bonding in Magnesium/Aluminum Overcasting Systems by Aluminum Surface Treatments
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DOI：
10.1007/s11663-014-0140-x
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发表时间：
2014-07
期刊：
影响因子：
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通讯作者：
H. Zhang;Yiqing Chen;A. Luo
中科院分区：
文献类型：
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作者：
H. Zhang;Yiqing Chen;A. Luo
“包覆铸造”技术用于生产轻质镁/铝（Mg/Al）结构，其中轻质镁可以铸造到固体Al基底上。形成强Mg/Al界面结合的固有困难是固体Al表面上的天然氧化膜，其降低了铸造过程中熔融Mg和Al基材之间的润湿性。在本文中，“电解抛光+阳极氧化”的表面处理已开发到破坏的氧化膜上的稀Al-0.08wt%Ga合金，改善熔融Mg和Al基板之间的冶金结合在高真空试验装置中进行的电抛光实验。试验结果为Mg/Al复合材料的界面现象提供了有价值的信息。结果表明，采用“电解抛光+阳极氧化”表面处理和Ga合金化处理的复合材料试样的冶金结合得到了显著改善。建议在实际的包覆铸造工艺中，通过调整铝基体的预热温度和时间以及镁熔体的温度来控制界面反应，以获得最佳的界面性能。
“Overcasting” technique is used to produce bimetallic magnesium/aluminum (Mg/Al) structures where lightweight Mg can be cast onto solid Al substrates. An inherent difficulty in creating strong Mg/Al interfacial bonding is the natural oxide film on the solid Al surfaces, which reduces the wettability between molten Mg and Al substrates during the casting process. In the paper, an “electropolishing + anodizing” surface treatment has been developed to disrupt the oxide film on a dilute Al-0.08 wt pct Ga alloy, improving the metallurgical bonding between molten Mg and Al substrates in the bimetallic experiments carried out in a high-vacuum test apparatus. The test results provided valuable information of the interfacial phenomena of the Mg/Al bimetallic samples. The results show significantly improved metallurgical bonding in the bimetallic samples with “electropolishing + anodizing” surface treatment and Ga alloying. It is recommended to adjust the pre-heating temperature and time of the Al substrates and the Mg melt temperature to control the interfacial reactions for optimum interfacial properties in the actual overcasting processes.