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

  • J. Sort (a1), J. Fornell (a2), W. Li (a3), S. Suriñach (a1) and M.D. Baró (a2)...

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.

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a) Address all correspondence to this author. e-mail: jordi.sort@uab.es

References

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Keywords

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

  • J. Sort (a1), J. Fornell (a2), W. Li (a3), S. Suriñach (a1) and M.D. Baró (a2)...

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