摘要 通过空化泡溃灭产生的微射流促使Al2O3纳米粒子对镁合金进行冲击强化。采用显微硬度仪、扫描电镜(SEM)、X射线光电子能谱(XPS)对强化后的样品硬度、表面形貌、元素含量与化学态等参数进行分析。结果表明,强化5 min后,通过SEM发现在样品表面出现纳米级颗粒,结合XPS测试、发现样品中Al2O3含量明显增多,表明Al2O3粒子渗入表面,将其硬度提高了29.1 HV。推测强化作用机制为空泡溃灭的能量传递给Al2O3粒子,继而由Al2O3粒子冲击样品表面,因此样品承受的冲击更加柔性,且Al2O3纳米粒子自身的强度、硬度等性能较好,渗入样品表面后能够进一步提升强化效果。 The impact of microjet generated by cavitation bubble collapse impels Al2O3 nanoparticles to strengthen magnesium alloy.The hardness,surface morphology,element content and chemical state of the strengthened samples were analyzed by microhardness test,SEM and XPS.The results show that after 5 min of strengthening,nanometer particles are found on the surface of the sample through SEM.Combined with XPS test,the content of Al2O3 in the sample is significantly increased,which indicates that Al2O3 particles penetrate into the surface and increase its hardness by 29.1 HV.The strengthening mechanism is that the energy of cavitation collapse is transferred to Al2O3 particle and then impacted by Al2O3 particle on the surface of the sample.Therefore,the impact of the sample is more flexible,and the strength,hardness and other properties of Al2O3 nanoparticle are better.After penetrating into the surface of the sample,the strengthening effect is further improved.
机构地区 徐州工程学院机电工程学院
出处 《实验室研究与探索》 CAS 北大核心 2021年第4期48-50,91,共4页 Research and Exploration In Laboratory
基金 江苏省高校自然科学研究面上项目(18KJB460028) 徐州工程学院校级青年项目(XKY2019215) 江苏省自然科学基金(BK20180177) 徐州市科技计划项(KC18014)。
