Ye Linzheng, Zhu Xijing, Wei Xumin, Wu Shu'an
Shanxi Key Laboratory of Advanced Manufacturing Technology, School of Mechanical Engineering, North University of China, Taiyuan 030051, China.
Shanxi Key Laboratory of Advanced Manufacturing Technology, School of Mechanical Engineering, North University of China, Taiyuan 030051, China.
Ultrason Sonochem. 2020 Oct;67:105175. doi: 10.1016/j.ultsonch.2020.105175. Epub 2020 May 16.
For the analysis of ultrasonic cavitation erosion on the surface of materials, the ultrasonic cavitation erosion experiments for AlCu4Mg1 and Ti6Al4V were carried out, and the changes of surface topography, surface roughness, and Vickers hardness were explored. Cavitation pits gradually expand and deepen with the increase of experiment time, and Ti6Al4V is more difficult to erode by cavitation than AlCu4Mg1. After experiments, the cavitation damage characteristics such as the single pit, the rainbow ring area, the fisheye pit, and some small pits were observed, which can be considered to be induced by a single micro-jet impact, ablation effect caused by the high temperature, micro-jet impingement with a sharp angle, and multibeam micro-jets coupling impact or negative pressure in the local area produced by micro-jet impact, respectively. The surface roughness and Vickers hardness of the material increase slowly after rapid growth at different points in time as the experiment time increases. With the increase of the ultrasonic amplitude, both of them first increase and then decrease after the ultrasonic amplitude is greater than 10.8 μm. The increases in surface roughness and Vickers hardness tend to decrease as the viscosity coefficient increases. Ultrasonic cavitation can cause submicron surface roughness and increase surface hardness by 20.36%, so it can be used as a surface treatment method.
为分析材料表面的超声空蚀情况，对AlCu4Mg1和Ti6Al4V进行了超声空蚀实验，探究了表面形貌、表面粗糙度和维氏硬度的变化。随着实验时间的增加，空蚀坑逐渐扩大和加深，Ti6Al4V比AlCu4Mg1更难被空蚀。实验后，观察到了单坑、彩虹环区域、鱼眼坑和一些小坑等空蚀损伤特征，它们分别可认为是由单个微射流冲击、高温引起的烧蚀效应、锐角微射流冲击以及微射流冲击产生的多束微射流耦合冲击或局部负压诱导产生的。随着实验时间增加，材料的表面粗糙度和维氏硬度在不同时间点快速增长后缓慢增加。随着超声振幅的增加，当超声振幅大于10.8μm时，二者均先增大后减小。随着粘度系数的增加，表面粗糙度和维氏硬度的增加趋势趋于减小。超声空蚀可导致亚微米级的表面粗糙度，并使表面硬度提高20.36%，因此可作为一种表面处理方法。
