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Reciprocating wear mechanisms in a Zr-based bulk metallic glass

Published online by Cambridge University Press:  03 March 2011

H.W. Jin ,
R. Ayer ,
J.Y. Koo ,
R. Raghavan  and
U. Ramamurty
H.W. Jin
Affiliation:
Advanced Structural Materials Section, ExxonMobil Research & Engineering Company, Annandale, New Jersey 08801
R. Ayer
Affiliation:
Advanced Structural Materials Section, ExxonMobil Research & Engineering Company, Annandale, New Jersey 08801
J.Y. Koo
Affiliation:
Advanced Structural Materials Section, ExxonMobil Research & Engineering Company, Annandale, New Jersey 08801
R. Raghavan
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore-560012, India
U. Ramamurty*
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore-560012, India
*
a) Address all correspondence to this author. e-mail: ramu@materials.iisc.ernet.in
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Abstract

The dry sliding friction coefficient μ and the wear volume loss W, in a zirconium-based bulk metallic glass (BMG) under high-frequency (50 Hz) reciprocating conditions, were investigated with the objective of assessing the influence of free volume and crystallization on the wear behavior of amorphous metals. The BMG samples were annealed either below the glass transition temperature Tg to induce structural relaxation and hence reduce the free volume that controls plasticity through shear-band formation or above Tg to crystallize the amorphous BMG prior to wear testing. Results show that the wear behavior of both the as-cast and relaxed glasses was dominated by the oxidation of the surface layers. A sharp transition in the contact electrical resistance complemented by a marked increase in μ was noted. This was attributed to the formation of a thick tribo film with high oxygen concentration and its subsequent delamination. The μ values, before as well as after the transition, in the relaxed glasses were similar to those for the as-cast alloy. However, a gradual decrease in W with annealing temperature was observed. A good correlation between W and nanohardness was noted, implying that the intrinsic hardness in the BMGs controlled the wear rate.

Keywords

AmorphousHardnessOxidation

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Type
Reviews
Information
Journal of Materials Research , Volume 22 , Issue 2 , September 2006 , pp. 264 - 273
Copyright
Copyright © Materials Research Society 2007

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