Abstract

As magnesium and its alloys are almost 35% lighter than aluminum alloys, they are ideal candidates for automotive and aerospace industries. In this research, multipass friction stir processing (FSP) was used to produce Mg-based surface nanocomposite with SiO₂ particles. Microstructure features such as grain size and particle distribution were investigated. The reactions between magnesium and nanoparticles and the relation between microstructure and hardness, wear resistance, and corrosion behaviour were also studies. The mean grain size of the composite after four passes reduced by 82%, its hardness increased by 29%, and its wear resistance increased more than 34.6% compared with Mg-base alloy. Furthermore, this composite had the best corrosion resistance as a result of fine grain size.

中文翻译：

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搅拌摩擦法研究AZ31-SiO 2表面纳米复合材料的组织和耐磨性

摘要

由于镁及其合金比铝合金轻近35％，因此它们是汽车和航空航天工业的理想选择。在这项研究中，多道次摩擦搅拌工艺（FSP）用于生产具有SiO ₂颗粒的Mg基表面纳米复合材料。研究了微观结构特征，例如晶粒尺寸和颗粒分布。还研究了镁与纳米颗粒之间的反应以及微观结构与硬度，耐磨性和腐蚀行为之间的关系。与镁基合金相比，复合材料经过四道次加工后的平均晶粒尺寸降低了82％，硬度提高了29％，耐磨性提高了34.6％以上。此外，由于细晶粒尺寸，该复合材料具有最佳的耐腐蚀性。