Abstract

In the fabrication of light weight structural materials, the as-cast ZK60 magnesium alloy plays a vital role in the replacement of aluminum alloy. As the wear and friction properties are poor for magnesium alloys, it is very much essential to adopt surface engineering to enhance these properties. Friction stir processing is one of the promising thermo-mechanical processing techniques that alters the grain refinement and surface properties of the material. This investigation is made to understand the impacts of tool traverse speed ranges from 5 to 25 mm/min in cast ZK60 and FSPed/ZK60/SiCp magnesium alloy friction stir processed zone formation. It is found that the FSP made by using the high tool traverse speed of 10 mm/min exhibited higher hardness (121.2HV) and uniform particle distribution in the processed zone. This may be attributed to the dispersion and grain boundary strengthening. Also, this study is further proceeded to transient temperature distribution during FSPed/ZK60 Mg alloy by using Finite Element method. From simulation, the maximum temperature determined is 462°C, which is notably less compared to the melting temperature of the plate.

中文翻译：

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搅拌摩擦过程诱导铸造 ZK60 镁合金/SiCp 表面复合材料的显微组织演变

摘要

在轻质结构材料的制造中，铸态ZK60镁合金在替代铝合金方面起着至关重要的作用。由于镁合金的磨损和摩擦性能较差，因此必须采用表面工程来增强这些性能。摩擦搅拌加工是一种很有前途的热机械加工技术，可以改变材料的晶粒细化和表面特性。本研究旨在了解工具横移速度范围从 5 到 25 毫米/分钟对铸造 ZK60 和 FSPed/ZK60/SiCp 镁合金搅拌摩擦加工区形成的影响。结果表明，采用 10 mm/min 的高刀具移动速度制成的 FSP 具有更高的硬度（121.2HV）和加工区的均匀颗粒分布。这可能归因于弥散和晶界强化。此外，该研究还通过使用有限元方法进一步研究了 FSPed/ZK60 镁合金过程中的瞬态温度分布。根据模拟，确定的最高温度为 462°C，与板的熔化温度相比明显更低。