TY - JOUR
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.
U2 - https://doi.org/10.1557/jmr.2009.0117
DO - https://doi.org/10.1557/jmr.2009.0117
M3 - Article
VL - 24
SP - 918
EP - 925
JO - Journal of Materials Research
JF - Journal of Materials Research
SN - 0884-2914
ER -