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Scratch test induced shear banding in high power laser remelted metallic glass layers

Published online by Cambridge University Press:  03 March 2011

D.T.A. Matthews ,
V. Ocelík  and
J.Th.M. de Hosson
D.T.A. Matthews
Affiliation:
Department of Applied Physics and Netherlands Institute for Metals Research, University of Groningen, Groningen 9474 AG, The Netherlands
V. Ocelík
Affiliation:
Department of Applied Physics and Netherlands Institute for Metals Research, University of Groningen, Groningen 9474 AG, The Netherlands
J.Th.M. de Hosson*
Affiliation:
Department of Applied Physics and Netherlands Institute for Metals Research, University of Groningen, Groningen 9474 AG, The Netherlands
*
a) Address all correspondence to this author. e-mail: j.t.m.de.hosson@rug.nl
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Abstract

Laser remelted surface layers of a Cu-based metallic glass forming alloy have been produced with fully amorphous depths up to 350 μm for single track widths of around 1.3 mm and have been checked by transmission of synchrotron radiation. They have been subjected to indentation hardness and scratch testing, and the development of shear bands in both situations has been addressed. During the cross-sectional hardness indentation tests, Vickers values of over 735 HV2 have been found through the depth of the treated layer, and the scratch testing has revealed extremely low friction coefficient values (<0.02 at 10 N in single-pass and 0.02 at 18 N multi-pass regimes against a diamond stylus). The shear band formation has been related to both scratch test speed (strain rate) and load (contact stress) by methods such as atomic force microscopy measurements and subsequent surface roughness characterization by a height–height correlation function.

Keywords

AmorphousLaserTribology
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 2 , September 2006 , pp. 460 - 470
Copyright
Copyright © Materials Research Society 2007

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References

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