Study on Wear Behavior of Gradient Nanocrystalline Structure on Pure Copper Surface Induced by Burnishing

doi:10.3901/JME.2017.24.049

Abstract

Abstract: Surface manufacturing of pure copper is conducted by a novel surface burnishing tool. Gradient nanocrystalline structure is prepared on pure copper surface based on plastic deformation. Said gradient nanocrystalline structure is characterized by metallographic microscope and transmission electron microscope. Thickness of gradient nanocrystalline structure and diameter of nanocrystalline are measured, respectively. Wear behavior of gradient nanocrystalline structure is also investigated. Results show the diameters of nanocrystalline are less than 20 nm. There is obvious gradient nanocrystalline structure on copper surface after burnishing. The surface roughness and cross-sectional hardness distribution after burnishing are also ideal. Results of dry friction experiments show that when the load is low, the gradient nanocrystalline structure exhibit advantage in resisting adhesion, so friction performance is better. When the load is high, the gradient nanocrystalline structure is destroyed by severe plastic deformation. Subsequently, micro fracture and the following three-body wear decrease the friction performance of gradient nanocrystalline structure.

Key words: burnishing, gradient nanocrystalline, surface manufacturing, wear behavior

CLC Number:

TG375

YUAN Junrui, XU Jia, ZHOU Zhenyu, PIAO Zhongyu. Study on Wear Behavior of Gradient Nanocrystalline Structure on Pure Copper Surface Induced by Burnishing[J]. Journal of Mechanical Engineering, 2017, 53(24): 49-54.

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