Influence of axial force on the pure titanium surface relief during friction stir processing

Abstract

In the present paper the friction stir processed surface morphology features of commercially pure titanium alloy are studied. Friction stir processing modifies the surface, which leads to changes in the relief and can lead to increased contamination or wear of the surface. In order to change the heat generation and deformation conditions, machining has been carried out under different axial force on the tool. The results of the study have shown that the friction stir processing does not form the typical rings on the front surface. The friction surface is a typical example of adhesive wear. It is shown that the relief characteristics are nonlinearly dependent on the axial force. The grain size is monotonically reduced with increasing axial force.