Nag, S., Narayan, R. L., Jang, J., Mukhopadhyay, C., Ramamurty, U. (2020). Statistical nature of the incipient plasticity in amorphous alloys. Scripta Materialia, 187, 360–365. https://doi.org/10.1016/j.scriptamat.2020.06.045
Abstract:
Statistical analyses of the first pop-in stress data, obtained by spherical tipnanoindentation
experiments on different metallic glasses (MGs) with tip radius, Ri, loading
rate, , and structural state of the glass as experimental variables, show that the 3-parameter
bimodal Weibull distribution best captures the stochastic nature of the incipient plastic strengths.
Significant bimodality in the strength distributions was observed only when a larger Ri and are
employed. We hypothesize that the stress required for shear band nucleation has to exceed a
critical value over a characteristic distance over which the stress gradients are minimum to
rationalize the bimodality.
License type:
Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
Funding Info:
This research / project is supported by the Agency for Science, Technology and Research - Structural Metals and Alloys Programme
Grant Reference no. : A18B1b0061