Nanoindentation simulation of coated aluminum thin film using quasicontinuum method

摘要: Abstract Two-dimensional quasicontinuum simulations of nanoindentation processes are conducted on aluminum thin films with nickel, copper, and silver coatings different thicknesses under various indenter widths using the embedded atom method (EAM) potentials. To study effects protective coating mechanical behavior coated films, process is performed to determine hardness, critical indentation load for first dislocation emission, depth other associated physical phenomena, such as defect nucleation evolution beneath indenter. The obtained results reveal that surface at nanoscale contacts may have a pronounced effect perceived hardness surface. Aluminum nickel copper can adopt material, whereas cannot improve contacts. increases decrease thickness, which indicates softening phenomenon happens in film. increase width, while decreases width increases. shown be good agreement limited available experimental data analytical Rice–Thomson Peierls–Nabarro models.