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Influence of the loading rate on the indentation response of Ti-based metallic glass

Published online by Cambridge University Press:  31 January 2011

J. Sort ,
J. Fornell ,
W. Li ,
S. Suriñach  and
M.D. Baró
J. Sort*
Affiliation:
Institució Catalana de Recerca i Estudis Avançats and Departament de Física, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
J. Fornell
Affiliation:
Departament de Física, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
W. Li
Affiliation:
School of Materials Science and Engineering, Anhui University of Technology, 243002 Maanshan Anhui, China
S. Suriñach
Affiliation:
Institució Catalana de Recerca i Estudis Avançats and Departament de Física, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
M.D. Baró
Affiliation:
Departament de Física, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
*
a) Address all correspondence to this author. e-mail: jordi.sort@uab.es
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Abstract

The mechanical behavior of Ti-based metallic glass has been investigated by means of indentation experiments at different loading rates. Contrary to many crystalline materials, an increase of the loading rate causes a reduction of hardness, i.e., a mechanical softening. This effect is ascribed to deformation-induced creation of excess free volume, which is more pronounced for higher strain rates. The decrease of hardness is accompanied with an increase of the contact stiffness and a reduction of the reduced elastic modulus. Finite element simulations reveal that the mechanical response of this material can be described using the Mohr-Coulomb yield criterion. The changes in the nanoindentation curves with the increase of loading rate are well reproduced by decreasing the value of the Mohr-Coulomb cohesive stress. This result is consistent with the presumed enhancement of free volume.

Keywords

AmorphousHardnessNanoindentation
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 3 , March 2009 , pp. 918 - 925
Copyright
Copyright © Materials Research Society 2009

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