Microstructural dependence of the incipient to homogeneous flow transition in metallic glass composites

SCRIPTA MATERIALIA

卷:188

Article

Gentile, Jonathan M.¹  Hofmann, Douglas C.²  Trelewicz, Jason R.^1,3 

[1] SUNY Stony Brook, Dept Mat Sci & Chem Engn, Stony Brook, NY 11794 USA

[2] CALTECH, Jet Prop Lab, Pasadena, CA 91125 USA

[3] SUNY Stony Brook, Inst Adv Computat Sci, Stony Brook, NY 11794 USA

关键词: Metallic glass composites;    Yield criteria;    Shear localization;    Flow transition;   

DOI  :  10.1016/j.scriptamat.2020.06.066

来源: Elsevier

【 摘 要 】

As ductile derivatives of amorphous alloys, metallic glass composites balance high strength with the ability to mitigate catastrophic shear localization, which has long plagued monolithic metallic glasses. In this study, we employ a bonded-interface indentation technique coupled with strain field mapping to identify the governing yield criterion in metallic glass composites as a function of their microstructural length scales. A crossover from the shear plane to maximum shear stress yield criterion is uncovered at a crystalline fraction of approximately 60%, thus signaling an effective transition from incipient to homogeneous flow as the dominant deformation mode of the composite microstructure. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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