用单摆划痕法研究Al2O3f/Al-9Si合金在不同冲击速度下的磨损行为

为揭示MMCs材料的冲击磨损机理 ,采用单摆划痕法对Al2 O3f/Al 9Si合金耐冲击磨损行为进行了研究 ,结果表明 :(1)在 3m/s冲击速度下 ,随着增强相的体积分数增多 ,Al2 O3f/Al 9Si合金抗冲击磨损性降低。在 4m/s冲击速度下 ,2 0 %Al2 O3f/Al 9Si合金具有最高的抗冲击磨损性 ,而 2 5 %Al2 O3f/Al 9Si合金的抗冲击磨损性最弱。对同一种Al2 O3f/Al 9Si合金材料 ,冲击速度为 4m/s时的耐冲击磨损性优于速度为 3m/s时的的耐冲击磨损性。(2 )在冲击磨损过程中 ,Al2 O3f/Al 9Si合金表面出现严重的犁沟和伴随发生的Al2 O3 短纤维被拉出基体形成空位的现象

Impact wear behavior and speed effect in Al_2O3f /Al_9Si MMC tested by single pendulum scratching

The impact wear test by single pendulum scratch method is one of the methods for investigating the work and wear performance of the spares under dynamic moving conditions. The impact wear resistance of the Al 2O 3f /Al 9Si MMC was studied, the resistance to impact wear was found to depend on the impact speed significantly. At an impact speed of 3 m/s,it decreases with the increase of Al 2O 3f fiber volume fraction in the volume fraction range between 10 and 25 percent. The resistance at 4 m/s impact speed maximized at the volume content of 20 percent, though it is higher than that at 3 m/s impact speed for all the studied Al 2O 3f content. SEM studies of the worn surface reveal two concurrent mechanisms, namely the serious plowing and the pull out of the Al 2O 3f short fibers.