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Deformation behavior of designed dual-phase CuZr metallic glasses

Peng, C. X. and Sopu, D. and Cheng, Y. and Song, K. K. and Wang, S. H. and Eckert, J. and Wang, L. (2019):
Deformation behavior of designed dual-phase CuZr metallic glasses.
In: Materials & Design, 1682019. Elsevier Ltd., p. 107662, ISSN 02641275,
DOI: 10.1016/j.matdes.2019.107662,
[Online-Edition: https://doi.org/10.1016/j.matdes.2019.107662],
[Article]

Abstract

A nanometer-scale second phase in metallic glass (MG) heterostructures is effective to improve mechanical properties. In this work, molecular dynamics simulations are conducted to investigate the influence of various critical structural aspects such as the size/volume fraction, distribution of a nanoscale secondary phase and different combinations of the matrix and the secondary phase on the deformation behavior of dual-phase MGs. We find an obvious change in deformation mode with varying the size/fraction and the chemical composition of the secondary phase. When the yield stress of the dual-phase MGs is lower than critical shear stresses required for forming a mature shear band (SB), the MGs show homogeneous deformation. Otherwise, those dual-phase MGs with inclusions smaller than width of the SB or that cannot confine plastic zones between the larger inclusions have high tendency for shear instability and brittle failure. By systematically varying the characteristics of the secondary phase one can design MGs with improved mechanical properties.

Item Type: Article
Erschienen: 2019
Creators: Peng, C. X. and Sopu, D. and Cheng, Y. and Song, K. K. and Wang, S. H. and Eckert, J. and Wang, L.
Title: Deformation behavior of designed dual-phase CuZr metallic glasses
Language: English
Abstract:

A nanometer-scale second phase in metallic glass (MG) heterostructures is effective to improve mechanical properties. In this work, molecular dynamics simulations are conducted to investigate the influence of various critical structural aspects such as the size/volume fraction, distribution of a nanoscale secondary phase and different combinations of the matrix and the secondary phase on the deformation behavior of dual-phase MGs. We find an obvious change in deformation mode with varying the size/fraction and the chemical composition of the secondary phase. When the yield stress of the dual-phase MGs is lower than critical shear stresses required for forming a mature shear band (SB), the MGs show homogeneous deformation. Otherwise, those dual-phase MGs with inclusions smaller than width of the SB or that cannot confine plastic zones between the larger inclusions have high tendency for shear instability and brittle failure. By systematically varying the characteristics of the secondary phase one can design MGs with improved mechanical properties.

Journal or Publication Title: Materials & Design
Volume: 168
Publisher: Elsevier Ltd.
Uncontrolled Keywords: Metallic glasses, Molecular dynamics, Dual-phase metallic glasses, Deformation, Ductility
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Materials Modelling
Date Deposited: 28 Jan 2020 07:26
DOI: 10.1016/j.matdes.2019.107662
Official URL: https://doi.org/10.1016/j.matdes.2019.107662
Projects: SO 1518/1-1
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