Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 787, Issue -, Pages 649-657Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.02.162
Keywords
Amorphous-crystalline interfaces; Molecular dynamics simulation; Anisotropic deformation behaviors; Nanolaminates
Categories
Funding
- National Key R&D Program of China [2018YFF01012400]
- National Science and Technology Innovation Leading Academic (Ten Thousand Talent Program)
- Fund Guiding on Strategic Adjustment of Jilin Provincial Economic Structure Project [2014Z045]
- Major project of Jilin Province Science and Technology development plan [20150203014GX]
- Science and Technology Development Program of Jilin province [20180520072JH]
- special fund project of Jilin provincial industrial innovation [2016C030]
- Jilin Provincial Middle and Young Scientific and Technological Innovation Talent and Team Project [20170519001JH]
- Interdisciplinary Research Fund of Jilin University [10183201822]
- Graduate Innovation Fund of Jilin University [2017141]
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Amorphous-crystalline nanolaminates (ACNLs) composed of CuZr metallic glass layers and single crystal copper layers were constructed, and the anisotropy of the material deformation behaviors were investigated by conducting shear loadings on the ACNL sample in parallel deforming and serial deforming directions using molecular dynamics method. In parallel deforming mode, the yielding of the material was mainly triggered by generation of dislocations and slips in crystalline layer, and both crystalline and amorphous phases participated in the subsequent plastic deforming. In serial deforming mode, the results showed that the yielding and plastic deforming of the material was induced by shear localization of amorphous layers only. Amorphous-crystalline interfaces (ACIs) served as stress resistance weakness and dislocations breeding cradle in the former deforming mode while a strong connection of two phases in the later deforming mode. Furthermore, the increasing of crystalline layer thickness would promote the material shear modulus and shear strength in both deformation modes. The promotions and incentives varied and had dependence on the coupled deforming mechanisms. For the serial deforming mode, the shear moduli obtained from our simulations fitted the predicted ones from rule-of-mixture very well, while in the parallel deforming mode, the simulated shear moduli were much higher than predicted ones, which could be explained with the size effect induced by reduction of crystalline layer thickness surround with ACIs. (C) 2019 Elsevier B.V. All rights reserved.
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