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G. Purcek, H. Yanar, A. Alsaran, D.V. Shangina, S.V. Dobatkin, ''Effect of high-pressure torsion on tribological properties of Cu-Cr-Zr alloy under reciprocating dry conditions'', ICETAT 2016, November 4-6, International Conference on Engineering Tribology and Applied Technology, Taipei, Taiwan
Abstract: The effect of ultrafine-grained (UFG) formation by means of high pressure torsion (HPT) on tribological properties of Cu-Cr-Zr alloy was studied. Dry wear tests were conducted using a pin-on-disc type tribometer (UTS Tribometer T10/20) under the reciprocating motion mode according to ASTM G-33 at room temperature in a laboratory environment. An UFG microstructure with a mean grain size of 155 nm was achieved by HPT.UFG formation via HPT increased the wear resistance as well as hardness and strength values of the alloy. More importantly, the precipitates dispersed within the UFG matrix during further aging significantly enhanced the strain hardening, resulting in improvement of hardness, strength and also wear resistance of the alloy due to the combined effect of grain refinement down to submicron level and precipitation. It was observed from the results that the wear behavior of Cu–Cr–Zr alloy was strongly dependent on its strength and hardness which indicated the consistency of the results with well-known Archard approach. The highest wear resistance was achieved when the sample was processed by HPT through an additional aging treatment, as this resulted in ultra-high strength and hardness. Also, a complex wear mechanisms including adhesive, oxidative and abrasive were operative in the alloy in all conditions.
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