Abstract Present work focused on the impact of high temperature on the tribological properties for thixoformed Al-5.7Si–2Cu-0.3 Mg alloy. A pin-on-disc tribometer was used for dry sliding wear experiments that were executed according to Taguchi method. Wear behaviour was investigated under four process parameters at three levels: process (as-cast, thixoforming, and thixoforming-T6), load (10, 50, and 100 N), sliding temperature (25, 150, and 300 °C), and sliding distance (1000, 3000, and 5000 m). Microstructure was characterized and evaluated by optical microscopy, scanning electron microscopy with energy dispersive X-ray detector, and X-ray diffraction. Results revealed that the thixoformed-T6 alloy consisted of fine globular structure and equiaxed grains, which showed excellent wear resistance at elevated temperature. The experimental values, which were within the permissible limits for the volume loss and coefficient of friction, were congruent to the predicted values because both performed at the rates of 96% and 89%, respectively. Despite increasing wear resistance of the thixoformed-T6 alloy at a sliding temperature of 300 °C, applied load of 100 N, and sliding distance of 3000 m, the best coefficient of friction was attained by the thixoformed-T6 alloy at a sliding temperature of 150 °C, applied load of 100 N, and sliding distance of 5000 m. The dominant wear mechanisms in tribological tests included abrasion, adhesion, and minor delamination.

中文翻译：

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触变成形 Al-5.7Si-2Cu-0.3 镁合金在高温下使用田口法的干滑动磨损行为

摘要 目前的工作主要集中在高温对触变成形 Al-5.7Si-2Cu-0.3 Mg 合金摩擦学性能的影响上。销盘式摩擦计用于根据田口方法进行的干滑动磨损实验。在三个水平的四个工艺参数下研究了磨损行为：工艺（铸态、触变成形和 T6）、载荷（10、50 和 100 N）、滑动温度（25、150 和 300 °C），和滑动距离（1000、3000 和 5000 m）。通过光学显微镜、带能量色散 X 射线检测器的扫描电子显微镜和 X 射线衍射对微观结构进行表征和评估。结果表明，触变形成的 T6 合金由细小的球状结构和等轴晶粒组成，在高温下表现出优异的耐磨性。实验值，体积损失和摩擦系数在允许的范围内，与预测值一致，因为两者的性能分别为 96% 和 89%。尽管在 300 °C 的滑动温度、100 N 的施加载荷和 3000 m 的滑动距离下触变 T6 合金的耐磨性有所提高，但触变 T6 合金在滑动温度为150 °C，施加的载荷为 100 N，滑动距离为 5000 m。摩擦学测试中的主要磨损机制包括磨损、粘附和轻微分层。尽管在 300 °C 的滑动温度、100 N 的施加载荷和 3000 m 的滑动距离下触变 T6 合金的耐磨性有所提高，但触变 T6 合金在滑动温度为150 °C，施加的载荷为 100 N，滑动距离为 5000 m。摩擦学测试中的主要磨损机制包括磨损、粘附和轻微分层。尽管在 300 °C 的滑动温度、100 N 的施加载荷和 3000 m 的滑动距离下触变 T6 合金的耐磨性有所提高，但触变 T6 合金在滑动温度为150 °C，施加的载荷为 100 N，滑动距离为 5000 m。摩擦学测试中的主要磨损机制包括磨损、粘附和轻微分层。