高硅铝合金及其原位复合材料干滑动磨损性能与机制

采用熔体反应法制备了(Al2O3 Al3Zr)p/Al-22%Si原位复合材料。探讨了高硅铝合金及其原位复合材料的干滑动磨损行为,并对其磨损表面和亚表面形貌进行了观察和分析。试验结果表明:复合材料的磨损量显著低于同条件下高硅铝合金的磨损量,且随颗粒体积分数的增大,复合材料的磨损量减小。磨损表面亚表面的SEM观察分析表明:高硅铝合金磨损表面存在与亚表面相连的撕裂纹和宽大的犁沟,其磨损机制为粘着磨损加磨粒磨损的混合型磨损;复合材料的磨损表面亚表面平整光滑,主要表现为磨粒磨损。

Wear Properties and Mechanism of Silumin and Its In-Situ Composites in Dry Sliding Wear

(Al2O3 Al3Zr)p/Al-22%Si in-situ composites were fabricated by direct melt reaction method.The dry sliding wear behaviour of the silumin and its composites were investigated.The SEM morphology of wore surface and subsurface were also observed and analyzed.The results show that the wear mass loss of the(Al2O3 Al3Zr)p/Al-22%Si composites is obviously less than that of the Al-22%Si alloy matrix under the same condition,and the wear mass loss of the(Al2O3 Al3Zr)p/Al-22%Si composites decreases further with the increase of in-situ particles volume fraction;The SEM analysis of worn surface and subsurface indicate that the tore crack connects to the subsurface and some furrows occur on the wear surface of Al-22%Si alloy.The wear mechanism of the matrix Al-22%Si alloy is adhesive and abrasive wear.While the wear surface and subsurface of(Al2O3 Al3Zr)p/Al-22%Si composites are smooth and lubricity,the wear mechanism of(Al2O3 Al3Zr)p/Al-22%Si composites is abrasive wear.