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Fundamental Aspects of Friction and Wear Contacts in <100> Surfaces

Published online by Cambridge University Press:  17 March 2011

William W. Gerberich ,
Natalia I. Tymiak  and
Donald E. Kramer
William W. Gerberich
Affiliation:
Department of Chemical Engineering and Materials ScienceUniversity of Minnesota, Minneapolis, MN 55455
Natalia I. Tymiak
Affiliation:
Department of Chemical Engineering and Materials ScienceUniversity of Minnesota, Minneapolis, MN 55455
Donald E. Kramer
Affiliation:
Now at National Institute for Standards and Technology, Gaithersburg, MD 20899
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Abstract

Unexpected friction and wear transitions occur in transition metals associated with dislocation emission, dislocation storage, and oxide break-through phenomena. Both normal nanoindentation and nanoscratch evaluations of conical diamond tips driven into tungsten {100} single crystal surfaces have been conducted. In terms of initiating plasticity undert 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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 649: Symposium Q – Fundamentals of Nanoindentation & Nanotribology II , 2000 , Q9.1
Copyright
Copyright © Materials Research Society 2001

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