Burnishing-induced gradient nano-grained copper and its fretting wear behaviors

作者：Zhao, Jing^*; Xia, Wei; Li, Ning; Li, Feng-Lei

来源：Journal of South China University of Technology(Natural Science Edition), 2013, 41(9): 120-125.

DOI：10.3969/j.issn.1000-565X.2013.09.020

• Fretting wear
• Fretting wear behavior
• Fretting wear test
• Friction and wear performance
• Friction and wear properties
• Nanocrystalline copper
• Nanograined structure
• Severe plastic deformations

In order to improve the surface properties of the burnished copper, a gradient nano-grained surface layer was fabricated by means of a multi-pass burnishing process with a large burnishing force, which can cause a severe plastic deformation. The fretting wear tests were then performed under a dry condition on the burnished copper and the coarse-grained (CG) copper in the forms of ball-on-plane, so as to reveal the influences of burnishing on the microstructure, the surface structure, the friction and wear properties as well as the wear mechanisms of nanocrystalline copper. The results show that (1) for the burnished samples, the grain size in the topmost burnished surface ranges from 4 nm to 18 nm, with an average value of about 9~10 nm;(2) as compared with the CG copper, the burnished copper is of a significantly-decreased surface roughness, which is from 1.50 μm to 0.55 μm, and its microhardness greatly increases from 52.2 to 120.0;(3) the friction and wear performance of the burnished copper under the whole range of load is better than that of the CG copper;and (4) the wear forms of the burnished copper are mainly abrasive wear and fatigue wear under low loads and turn to be mainly abrasive wear and adhesive wear under high loads.

• 出版日期2013-9
• 单位华南理工大学