OFHC copper pins with 10 ppm oxygen were slid against alumina at a load of 50 N and sliding speeds of 0.1 ms−1 to 4.0 ms−1. The wear characteristics of copper were related to the strain rate response of copper under uniaxial compression between strain rates of 0.1 s−1 and 100 s−1 and temperatures in the range of 298 K to 673 K. It is seen that copper undergoes flow banding at strain rates of 1 s−1 up to a temperature of 523 K, which is the major instability in the region tested. These flow bands are regions of crack nucleation. The strain rates and temperatures existing in the subsurface of copper slid against alumina are estimated and superimposed on the strain rate response map of copper. The superposition shows that the subsurface of copper slid at low velocities is likely to exhibit flow band instability induced cracking. It is suggested that this is the reason for the observed high wear rate at low velocities. The subsurface deformation with increasing velocity becomes more homogeneous. This reduces the wear rate. At velocities >2 ms−1 there is homogeneous flow and extrusion of thin (10 μm) bands of material out of the trailing edge. This results in the gradual increase of wear rate with increasing velocity above 2.0 ms−1.
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October 1999
Research Papers
Sliding Wear of Copper Against Alumina
Satish V. Kailas,
Satish V. Kailas
Department of Mechanical Engineering, Indian Institute of Science, Bangalore 560 012, India
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S. K. Biswas
S. K. Biswas
Department of Mechanical Engineering, Indian Institute of Science, Bangalore 560 012, India
Search for other works by this author on:
Satish V. Kailas
Department of Mechanical Engineering, Indian Institute of Science, Bangalore 560 012, India
S. K. Biswas
Department of Mechanical Engineering, Indian Institute of Science, Bangalore 560 012, India
J. Tribol. Oct 1999, 121(4): 795-801 (7 pages)
Published Online: October 1, 1999
Article history
Received:
February 9, 1998
Revised:
October 22, 1998
Online:
January 24, 2008
Citation
Kailas, S. V., and Biswas, S. K. (October 1, 1999). "Sliding Wear of Copper Against Alumina." ASME. J. Tribol. October 1999; 121(4): 795–801. https://doi.org/10.1115/1.2834137
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