Abstract

The high-temperature dry sliding wear behavior of an Al–12Si–CuNiMg alloy and its composite reinforced with Al₂O₃ fibers are investigated at 27 °C, 100 °C, 200 °C, and 300 °C. Wear tests are conducted under a constant sliding velocity of 1 m/s and various normal loads ranging from 2.5 to 10 N. To investigate the influence of temperature on the wear mechanisms, the worn surfaces of the matrix alloy and composite surfaces are carefully examined using scanning electron microscopy and energy dispersive spectroscopy. At 100–200 °C, the wear resistance of the composite increases, with the highest resistance recorded at 200 °C. The wear resistance decreases with the increase in the temperature from 200 to 300 °C. The wear resistance of the matrix alloy decreases as the temperature increases from 200 to 300 °C; however, it does not exhibit better wear resistance than the composite in the same temperature range. Furthermore, the friction coefficients of these two materials are discussed. The worn surface analysis performed at different temperatures indicates that the dominant wear mechanisms of both materials are related to adhesion and delamination under the chosen test conditions.

Graphic Abstract

中文翻译：

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Al-12Si-CuNiMg合金及其Al2O3纤维增强复合材料的高温干滑动磨损行为

摘要

Al-12Si-CuNiMg合金及其Al ₂ O ₃增强复合材料的高温干滑动磨损行为纤维在 27 °C、100 °C、200 °C 和 300 °C 下进行了研究。磨损试验在 1 m/s 的恒定滑动速度和 2.5 至 10 N 的各种法向载荷下进行。 为了研究温度对磨损机制的影响，使用扫描电子显微镜和能量色散光谱。在 100–200 °C 时，复合材料的耐磨性增加，最高耐磨性记录在 200 °C 时。耐磨性随着温度从200℃升高到300℃而降低。基体合金的耐磨性随着温度从200℃升高到300℃而降低；然而，在相同的温度范围内，它并不表现出比复合材料更好的耐磨性。此外，讨论了这两种材料的摩擦系数。在不同温度下进行的磨损表面分析表明，两种材料的主要磨损机制与所选测试条件下的粘附和分层有关。

图形摘要