ADHESIVE PHENOMENA AT THE ALPHA-FE INTERFACE DURING NANOINDENTATION, STRETCH AND SHOCK

The processes of nanoindentation, stretching and shock of alpha-Fe asp erity with the (100) and (114) alpha-Fe surfaces are computer simulate d at the atomic level by a molecular dynamics technique. Atomistic mec hanisms of contact creation during push indentation and contact breaki ng during the following pull stretch are investigated. The correlation between the structure transformation and the variations of the adhesi ve bond number, viscosity of contact, energy and force of adhesion is analysed. The crowdion mechanism of plastic deformation under indentat ion is confirmed. An adhesive model for the strength-differential effe ct is developed. The adhesive-vibratory effect during the shock of nan oparticles is observed. The acoustic vibrations generated during the s hock are shown to transform into inelastic flow, amorphization and fra cture of nanoparticles. The resonance principle of powders compacting is proposed.