Enhancing the tribological properties of pure Ti by pinless friction surface stirring
MATERIALS SCIENCE AND TECHNOLOGY(2023)
Abstract
Friction surface stirring (FSS) was employed to enhance the tribological properties of commercially pure Ti (CP-Ti). Applying FSS under the optimised process parameters (i.e. rotation and traverse speeds of 100 rpm and 8 mm/min, respectively) was found to increase the surface hardness of as-received CP-Ti from about 200-630 HV. The sliding wear resistance was therefore increased by 76, 76, and 85% under applied loads of 5, 10, and 20 N, respectively. The average friction coefficient (AFC) of CP-Ti also reduced considerably by the FSS. For instance, the AFC was reduced from 0.67 & PLUSMN; 0.07 and 1.04 & PLUSMN; 0.14 to about 0.33 & PLUSMN; 0.03 and 0.45 & PLUSMN; 0.04 at the applied loads of 5 and 20 N, respectively. The wear and friction mechanisms were also discussed.
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Key words
CP-Ti,friction surface stirring,pinless tool,hardness,sliding wear,tribology
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