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

Jordi Sort; J. Fornell; W. Li; S. Suriñach; M. D. Baró

doi:https://doi.org/10.1557/jmr.2009.0117

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

Jordi Sort, J. Fornell, W. Li, S. Suriñach, M. D. Baró

Department of Physics

Research output: Contribution to journal › Article › Research › peer-review

13 Citations (Scopus)

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. © 2009 Materials Research Society.

Original language	English
Pages (from-to)	918-925
Journal	Journal of Materials Research
Volume	24
DOIs	https://doi.org/10.1557/jmr.2009.0117
Publication status	Published - 1 Mar 2009

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title = "Influence of the loading rate on the indentation response of Ti-based metallic glass",

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. {\textcopyright} 2009 Materials Research Society.",

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T1 - Influence of the loading rate on the indentation response of Ti-based metallic glass

AU - Sort, Jordi

AU - Fornell, J.

AU - Li, W.

AU - Suriñach, S.

AU - Baró, M. D.

PY - 2009/3/1

Y1 - 2009/3/1

N2 - 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. © 2009 Materials Research Society.

AB - 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. © 2009 Materials Research Society.

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DO - https://doi.org/10.1557/jmr.2009.0117

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