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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
In order to reveal the mechanism of impact wear of MMCs, the impact wear behavior of Al2 O3f / Al 9Si alloy was studied by single-pendulum scratch test. The results show that: (1) At the impact velocity of 3m / s, Increased fraction, Al2 O3f / Al 9Si alloy impact resistance and wear resistance decreased. The 20% Al 2 O 3f / Al 9Si alloy had the highest impact wear resistance at 4 m / s impact speed, whereas the 25% Al 2 O 3 f / Al 9 Si alloy exhibited the weakest impact wear resistance. For the same kind of Al 2 O 3 f / Al 9 Si alloy, the impact resistance at 4 m / s is better than the impact resistance at 3 m / s. (2) In the process of impact wear, serious furrows and accompanying Al 2 O 3 short fibers are pulled out of the matrix to form vacancies on the surface of Al 2 O 3 f / Al 9 Si alloy