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Title: Statistical nature of the incipient plasticity in amorphous alloys
Authors: Nag, Shankha
Narayan, R. L.
Jang, Jae-il
Mukhopadhyay, C.
Ramamurty, Upadrasta
Keywords: Engineering::Mechanical engineering
Issue Date: 2020
Source: 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.
Journal: Scripta Materialia
Abstract: Statistical analyses of the first pop-in stress data, obtained by spherical tip-nanoindentation experiments on different metallic glasses (MGs) with tip radius, Ri, loading rate,P˙, 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 P˙ 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.
ISSN: 1359-6462
DOI: 10.1016/j.scriptamat.2020.06.045
Rights: © 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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