Statistical nature of the incipient plasticity in amorphous alloys

Statistical nature of the incipient plasticity in amorphous alloys

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 be...

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Bibliographic Details
Main Authors: Nag, Shankha, Narayan, R. L., Jang, Jae-il, Mukhopadhyay, C., Ramamurty, Upadrasta
Other Authors: School of Mechanical and Aerospace Engineering
Format: Article
Language:English
Published: 2022
Subjects:
Engineering::Mechanical engineering
Metallic Glass
Plastic Deformation
Online Access:https://hdl.handle.net/10356/162009
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Institution: Nanyang Technological University
Language: English
Description
Summary: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.

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