原位自生Si_p/ZA27复合材料的磨损性能

Wear properties of in-situ Si_p/ZA27 composites

研究Sip体积分数和实验温度对原位自生Sip/ZA27复合材料磨损性能的影响。结果表明:随着Sip体积分数的增加,其耐磨性呈先增大、后减小、进而又增大的趋势;随着实验温度的升高,复合材料的耐磨性减弱,但不同Sip体积分数的材料其耐磨性减小的幅度不同;所有这些变化均由磨损机理决定;随Sip体积分数的增加,材料的主导磨损机制将从较严重的磨损机制――塑性变形诱导磨损和粘着磨损转向轻微的磨损机制――涂抹磨损,进而又转向严重的磨损机制――塑性变形诱导磨损,最后则又转变为相对轻微的磨损机制――伴随磨料磨损的涂抹;随着实验温度的升高,主导磨损机制从轻微的磨损机制――伴随磨料磨损的涂抹转向严重的磨损机制――塑性变形诱导磨损和粘着磨损;高硬度磨层的形成与否决定着Sip/ZA27复合材料的耐磨性及磨损机制。

The effects of silicon particle（Sip） content and testing temperature on wear properties of in-situ Sip/ZA27 composites were investigated. The results indicate that the wear resistance increases firstly, then decreases, while finally increases again. The wear resistance decreases with the increase of testing temperature. But the decrease ranges of wear resistance of the composites with different Sip contents are different. All these variations of the wear resistance are determined by the wear mechanisms. As the Sip content increases, the dominative wear mechanism changes from a relatively severe regime of plastic deformation accompanied by adhesion wear to a mild regime of smear, then to a very severe regime of severe plastic deformation induced wear, and finally again to a relative mild regime of smear accompanied by abrasive wear. As the testing temperature elevates, the wear mechanism changes from a mild regime of smear accompanied by abrasive wear to a severe regime of plastic deformation accompanied by adhesion wear. The characteristics of worn surface layers determine the wear resistance and wear mechanisms.