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Effect of sliding velocity on the tribological behavior of copper and associated nanostructure development

Emge, Andrew William

Abstract Details

2008, Doctor of Philosophy, Ohio State University, Materials Science and Engineering.
The unlubricated sliding of metals is important in many mechanical devices covering a wide range of sliding velocities. However, the effect of sliding velocity on the tribological behavior of unlubricated metals has not been widely studied. Similarly, the relationship between microstructures developed at high sliding velocities and tribological behavior has not been studied in depth. The current research relates two aspects of the sliding friction of ductile metals, the effect of sliding velocity and the production of nanocrystalline tribomaterial. The project focused on the effects of sliding velocity on the frictional behavior of oxygen free high conductivity (OFHC) copper sliding against 440C stainless steel, Nitronic 40 stainless steel, and copper. Low velocity tests were performed with a pin on disk tribometer. High velocity tests were performed with a rotating barrel gas gun (RBGG) which combined impact with sliding. Surface and subsurface microstructures and chemical compositions of the worn samples were characterized with a wide range of instruments. In the case of self-mated copper the sliding velocity had little effect on the coefficient of friction and associated microstructural changes. An increase in the coefficient of friction for copper sliding against stainless steel in both the pin on disk and RBGG systems was observed. For the pin on disk tests the coefficient of friction was strongly influenced by material transfer from the copper to the steel pin. The increase in the coefficient of friction for the RBGG tests was correlated to an increase in subsurface plastic deformation. The growth of the nanocrystalline tribolayer in copper after sliding against 440C stainless steel at varying times was studied at sliding velocities of 0.05 and 1.0 m/s. The 0.5 m/s sliding velocity produced a consistent nanocrystalline layer in as little as 10 s. The thickness of the nanocrystalline layer grew continuously at sliding times of up to 10 ks. The 1.0 m/s sliding velocity produced a continuous nanocrystalline layer after 10 s of sliding. Ledges developed on the wear tracks which greatly influenced the tribolayer thickness making it difficult to quantify. Dynamic recrystallization of the tribolayer also led to difficulties in measuring its thickness.
David Rigney (Advisor)
212 p.

Recommended Citations

Citations

  • Emge, A. W. (2008). Effect of sliding velocity on the tribological behavior of copper and associated nanostructure development [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1199246829

    APA Style (7th edition)

  • Emge, Andrew. Effect of sliding velocity on the tribological behavior of copper and associated nanostructure development. 2008. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1199246829.

    MLA Style (8th edition)

  • Emge, Andrew. "Effect of sliding velocity on the tribological behavior of copper and associated nanostructure development." Doctoral dissertation, Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1199246829

    Chicago Manual of Style (17th edition)