Reciprocating sliding wear test between pin-on-flat Ti-6Al-4V/Ti-6Al-4V in dry conditions for
constant normal load 200 N, speed of motor 100 RPM and variable duration of cycles 4200 s and
12600 s has been conducted. The average of coefficient of friction for the three testing shows the
average of 0.265. This COF rate is stable start from 5 s until the end of testing. The wear rate starts
to stabilise with increasing duration of cycles by seeing the value of weight loss over the duration of
the cycle. The black spot which figures at the edge of wear track as known as collected wear
adhesion debris shows the high value of hardness. The mechanism of wear can assume similar
because there is no significant difference in hardness value at the unworn, worn, and black spot
areas for 4200 s and 12600 s tests.