Abstract
Abstract Low friction between DLC coating and Ti 6Al 4V alloy was investigated under fretting conditions on a fretting-wear testing machine. The results indicated that, during the beginning period, the Ti 6Al 4V surface was damaged as a consequence of adhesion (and abrasion), leading to high friction coefficients of around 0.5. With the test ongoing, a tribofilm was formed on the rubbed Ti 6Al 4V surface. This tribofilm was derived from the wear product of Ti 6Al 4V alloy with oxidization. Its nano-hardness and reduced elastic modulus were greater than the Ti 6Al 4V matrix. Meanwhile, structural transformation occurred on the rubbed DLC surface. The tribofilm and transformed carbonaceous layer prevented the Ti 6Al 4V alloy and the DLC surface from direct contact and led to low friction coefficients (below 0.2).
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