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首页> 外文期刊>Journal of Materials Engineering and Performance >Surface Wear Behavior and Friction and Wear Mechanism Studies of A356/3 wt.% Al3Zr Composites
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Surface Wear Behavior and Friction and Wear Mechanism Studies of A356/3 wt.% Al3Zr Composites

机译：A356 / 3重量％的表面磨损行为和磨损机制研究％Al3zr复合材料

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摘要

A direct-melt reaction was used to successfully synthesize A356/3 wt.% Al3Zr composites at 750 degrees C, 770 degrees C and 790 degrees C from the Al-K2ZrF6 system. The friction and wear characteristics of composites synthesized at 750celcius were determined by carrying out dry sliding tests of varying loads and sliding speeds. Polarized light microscopy, metallurgical microscopy, x-ray diffraction, scanning electron microscopy and confocal laser scanning microscopy were applied to identify the phase compositions and observe the microstructure and morphology of the worn surfaces. Finally, the wear mechanism of composites and matrix was analyzed by observing the SEM pictures of the wear surfaces. The results indicate that Al3Zr particles are successfully formed in the matrix. At 750celcius, the particles were the smallest and dispersed well in the matrix. The size of the reinforced particles increases with increasing reaction temperature. The hardness of the composites is greatly improved compared to that of the matrix, and the highest hardness reaches 245.6 HV. The experiments show that the friction coefficient of the composites is lower than that of the matrix, and the smallest average friction coefficient is 0.367. The volume wear loss of the composites is less than that of the matrix. The wear mechanism of composites is mainly adhesive wear and is accompanied by abrasive wear and fatigue wear because of the change in experimental parameters. Eventually, delamination wear occurs, and the wear resistance is better than that of the matrix.
机译：采用直接熔融反应在750℃、770℃和790℃下从Al-K2ZrF6系统成功合成了A356/3 wt.%Al3Zr复合材料。通过进行不同载荷和滑动速度的干滑动试验，确定了在750celcius下合成的复合材料的摩擦磨损特性。采用偏光显微镜、金相显微镜、x射线衍射、扫描电子显微镜和共焦激光扫描显微镜对磨损表面的相组成进行了鉴定，并观察了磨损表面的微观结构和形貌。最后，通过观察磨损表面的SEM照片，分析了复合材料和基体的磨损机理。结果表明，在基体中成功地形成了Al3Zr颗粒。750celcius时，颗粒最小，在基质中分散良好。随着反应温度的升高，增强颗粒的尺寸增大。与基体相比，复合材料的硬度大大提高，最高硬度达到245.6HV。实验表明，复合材料的摩擦系数低于基体，最小平均摩擦系数为0.367。复合材料的体积磨损量小于基体。复合材料的磨损机制主要是粘着磨损，由于实验参数的变化，复合材料的磨损机制主要是磨粒磨损和疲劳磨损。最终，出现分层磨损，耐磨性优于基体。

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