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Experimental Studies and Molecular Dynamics Simulations of the Sliding Contact of Metallic Glass

Published online by Cambridge University Press:  17 March 2011

Xi-Yong Fu ,
Michael L. Falk  and
David A. Rigney
Xi-Yong Fu
Affiliation:
Materials Science and Engineering, The Ohio State University, Columbus, 43210 OH, U.S.A.
Michael L. Falk
Affiliation:
Materials Science and Engineering, University of Michigan, Ann Arbor, 48109 MI, U.S.A.
David A. Rigney
Affiliation:
Materials Science and Engineering, The Ohio State University, Columbus, 43210 OH, U.S.A.
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Abstract

Tribological properties of bulk metallic glass Zr41.2Ti13.8Cu12.5Ni10.0Be22.5 were studied experimentally using a pin/disk geometry without lubrication. Experimental observations were compared with 2D molecular dynamics simulations of amorphous material in sliding contact. The friction coefficient and the wear rate of bulk metallic glass (BMG) depend on normal load and test environment. The sliding of annealed BMG re-amorphizes devitrified material. A mechanically mixed layer is generated during sliding; this layer has enhanced oxygen content if the sliding is in air. The MD simulations show that atomic scale mixing occurs across the sliding interface. The growth kinetics of the mixing process scales with the square root of time. In the simulations, a low density region is generated near the sliding interface; it corresponds spatially to the softer layer detected in experiments. Subsurface displacement profiles produced by sliding and by simulation are very similar and are consistent with the flow patterns expected from a simple Navier-Stokes analysis when the stress state involves both compression and shear.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 644: Symposium L – Supercooled Liquid, Bulk Glassy and Nanocrystalline State of Alloys , 2000 , L1.8
Copyright
Copyright © Materials Research Society 2001

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