Tribological behavior of Ti-6Al-4V and Ti-6Al-7Nb Alloys for Total Hip Prosthesis

Table 3

Roughness parameters of Ti alloy after polishing.

Parameters/(nm)	Ti-6Al-7Nb	Ti-6Al-4V
Ra	0.04	0.06
Rq	0.05	0.08
Rz	0.97	1.05
Rt	1.04	1.19

Ra: arithmetic average of absolute values, Rq: root mean squared, Rt: maximum height of the profile, and Rz: the average distance between the highest peak and lowest valley in each sampling length, ASME Y14.36M-1996 surface texture symbols.