Statistical nature of the incipient plasticity in amorphous alloys
- Authors
- Nag, Shankha; Narayan, R. L.; Jang, Jae-il; Mukhopadhyay, C.; Ramamurty, Upadrasta
- Issue Date
- Oct-2020
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Metallic glass; Plastic deformation; Nanoindentation; Statistics; Bimodal distribution
- Citation
- SCRIPTA MATERIALIA, v.187, pp.360 - 365
- Indexed
- SCIE
SCOPUS
- Journal Title
- SCRIPTA MATERIALIA
- Volume
- 187
- Start Page
- 360
- End Page
- 365
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/1736
- DOI
- 10.1016/j.scriptamat.2020.06.045
- ISSN
- 1359-6462
- Abstract
- Statistical analyses of the first pop-in stress data, obtained by spherical tip-nanoindentation experiments on different metallic glasses (MGs) with tip radius, R-i, loading rate, (P) over dot, 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 R-i and (P) over dot 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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