Plastic Deformation and Modification of Surface Characteristics in Nano and Micro Levels and Enhancement of Electric Field of FCC Materials Using Cavitaion Phenomenon

摘要

The aim of this paper is touddemonstrate andudestablish a possible application of the cavitation udphenomenon as an efficient method to modify surface properties. Three FCC ud(Face Centered Cudubic) udmaterials were subjected to high udsudpeedudsubmerged cavitating jets under certain working conditions, udfor time periods between 15 and ud1,800 s. The force generated byudcavitation is employed to modify the udsurface roughness in udnano and micro scales. The target surface udwas investigated with uddigitudal optical udmicroscopyud, udatomic force andudelectrostatic force microscopyud(AFM and EFM) udand also with a udwhite udlight interferometuderud.udThese different observation techniques indicate that at short exposure times, udthe udobserved udcharacteristic features in the microudstructure ud–udhills, holes and wavy configuratudionud–udcan be udrelated to the start of the plastic deformation of the specimen surface. Longer exposure times udinevitably result in a greater number of jetudspecimen interactions leading to specimen erosion and udfractudure. The results uddemonstrateudthe possibility to uduse cavitation bubbles udas a udmicroud-udnanofabrication udmethod for the surface preparationud/modificationudorudshootud-udless surface peening. udEFM udresults present uda udpossibilityudof using cavitation as tool to enhance the eudlectrostatic udproperties ofuda metal surface by udmodifying uditsudroughness. The degree of enhancementuddepends oudn the material properties.