摘要
通过空化泡溃灭产生的微射流促使Al_(2)O_(3)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Al_(2)O_(3)含量明显增多,表明Al_(2)O_(3)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Al_(2)O_(3)粒子,继而由Al_(2)O_(3)粒子冲击样品表面,因此样品承受的冲击更加柔性,且Al_(2)O_(3)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 Al_(2)O_(3) 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 Al_(2)O_(3) in the sample is significantly increased,which indicates that Al_(2)O_(3) 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 Al_(2)O_(3) particle and then impacted by Al_(2)O_(3) particle on the surface of the sample.Therefore,the impact of the sample is more flexible,and the strength,hardness and other properties of Al_(2)O_(3) nanoparticle are better.After penetrating into the surface of the sample,the strengthening effect is further improved.
作者
刘磊
郭华锋
于萍
李龙海
陆兴华
LIU Lei;GUO Huafeng;YU Ping;LI Longhai;LU Xinghua(School of Mechanical and Electrical Engineering,Xuzhou Institute of Technology,Xuzhou 221000,Jiangsu,China)
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)。
