【摘 要】
：
2024 aluminum alloy was implanted with nitrogen then titanium at different titanium target sputtering currents by plasma-based ion implantation(PBII).The appear
【机 构】
：
School of Materials Science and Engineering,State Key Laboratory of Solid Lubrication
论文部分内容阅读
2024 aluminum alloy was implanted with nitrogen then titanium at different titanium target sputtering currents by plasma-based ion implantation(PBII).The appearances were observed by atomic force microscope,andthe surface hardness was measured with Knoop hardness tester and the mechanical property microprobe.Ball-on-discdry wear experiments were performed under ambient air conditions,to study the tribological properties of the modified layers against GCr15 steel ball,employing various loads and a constant sliding speed.After dual modifications,surface hardness at 100 nm depth could reach to 9 GPa,increasing by about 5 times; tribological properties at lowerload(e.g.1 N)were obviously improved,with the friction coefficient(below 0.2)decreasing by over 60%,and the wear life(800 times)increasing by about 5 times.Meanwhile,with the increase of the sputtering current,the appearance is smooth,the surface hardness tends to a slow and even variation,the wear life presents a parabola-like change,and the friction coefficient and the adhesive wear degree decrease.However,tribological properties are reduced with the increase of the load due to the modified layer rapidly getting thin.
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