Statistical nature of the incipient plasticity in amorphous alloys

Nag, S and Narayan, RL and Jang, JI and Mukhopadhyay, C and Ramamurty, U (2020) Statistical nature of the incipient plasticity in amorphous alloys. In: Scripta Materialia, 187 . pp. 360-365.

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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. © 2020 Acta Materialia Inc.

Item Type:	Journal Article
Publication:	Scripta Materialia
Publisher:	Acta Materialia Inc
Keywords:	Amorphous alloys; Glass; Metallic glass; Stochastic systems; Weibull distribution, Characteristic distance; Incipient plasticity; Nanoindentation experiments; Plastic strength; Stochastic nature; Strength distribution; Stress gradient; Structural state, Stress analysis
Department/Centre:	Division of Interdisciplinary Sciences > Management Studies
Date Deposited:	10 Nov 2021 14:22
Last Modified:	10 Nov 2021 14:22
URI:	http://eprints.iisc.ac.in/id/eprint/65960

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