Influences of work hardening and crystallographic texture on dry-sliding tribological properties of friction stir processed pure Ti with slow rotation speed

Abstract

Dry-sliding wear behaviors of the pure Ti specimens before and after friction stir processing (FSP) with slow rotation speed sliding against AISI-52100 steel balls at different applied loads was investigated. The fine grained FSPed samples were with strong work hardening and crystallographic texture. Work hardening of the samples was compared by stored energy which was calculated by grain boundaries. The results of wear test were that the wear resistance of pure Ti was affected by work hardening and texture. The wear resistance of the FSPed sample showed variation in the depth direction. Severe abrasive wear happened on the surface of FSPed specimen with excessively high work hardening and limited toughness. Strong texture with c-axis parallel to PD was favorable to increase wear resistance. The FSPed pure Ti at 1 mm depth with fine grains, appropriate stored energy and suitable texture exhibited the outstanding wear resistance.