Fundamental aspects of friction and wear contacts in <100> surfaces

William W. Gerberich, Natalia I. Tymiak, Donald E. Kramer

Research output: Contribution to journalArticlepeer-review

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Unexpected friction and wear transitions occur in transition metals associated with dislocation emission, dislocation storage, and oxide break-through phenomena. Both normal nanoidentation and nanoscratch evaluations of conical diamond tips driven into tungsten {100} single crystal surfaces have been conducted. In terms of initiating plasticity under the contact, this represents a high Peierl's barrier for dislocation motion in transition metals. Both quasi-equilibrium and kinetic aspects are reported along with current but speculative ideas on multiple friction and wear transitions. Preliminary results show that yielding under contacts can produce a 250 nm displacement excursion. Ramifications are seen in terms of friction coefficients which can double during the near-instantaneous yield excursion but then continue to triple from about 0.05 to 0.15 in the pile-up phase in front of the sliding contact. Implications of how nanotribological issues such as adhesion connect through this mesoscale activity to macroscopic friction and wear are discussed.

Original languageEnglish (US)
Pages (from-to)Q9.1.1-Q9.1.12
JournalMaterials Research Society Symposium-Proceedings
StatePublished - Jan 1 2001
EventFundamentals of Nanoindentation and Nanotribology II - Boston, MA, United States
Duration: Nov 28 2000Nov 30 2000

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