We examine the role of important alloying elements (Al, Y), on friction and wear mechanisms of Mg as a function of temperature. Friction and wear tests of Mg–5%Al and Mg–5%Y alloys performed at room temperature, 100 °C and 150 °C reveal that addition of Al and Y significantly reduces the coefficient of friction. However, despite higher hardness of Mg–5%Y alloy, its wear rate was found to be higher than Mg–5%Al alloy at elevated temperatures. We show that this behaviour, observed for Mg–5%Y alloy at elevated temperature, can be attributed to its higher surface energy than Mg–5%Al and pure Mg, leading to enhanced adhesive wear, which is detrimental to tribological applications.

中文翻译：

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镁与铝和钇合金在高温下的纳米磨损机理

我们研究了重要合金元素（Al，Y）在镁的摩擦和磨损机理上的作用，该作用是温度的函数。在室温，100°C和150°C下对Mg–5％Al和Mg–5％Y合金进行的摩擦和磨损测试表明，添加Al和Y会显着降低摩擦系数。然而，尽管Mg–5％Y合金具有更高的硬度，但发现其在高温下的磨损率高于Mg–5％Al合金。我们表明，在高温下观察到的Mg–5％Y合金的这种行为，可以归因于其比Mg–5％Al和纯Mg更高的表面能，从而导致胶粘剂磨损增加，这对摩擦学应用不利。