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The pure titanium(TA2),Ti6Al4V,Ti6Al7Nb treated by ammonia gas (NH3) plasma immersion ion implantation-deposition (PIII-D) is investigated.On a torsional fretting wear test rig,the torsional fretting wear tests of un-treated and plasma implantation nitrided alloy against Zr2O ball (with diameter of 25.2 mm) were carried out under a simulated physiological condition (serum solution).