期刊
SCRIPTA MATERIALIA
卷 192, 期 -, 页码 67-72出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2020.10.007
关键词
Metallic glasses; Bicontinuous structure; Nanoporous structure; Molecular dynamics; Mechanical properties
类别
资金
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0020295]
- University of Southern California's Center for High-Performance Computing
- U.S. Department of Energy (DOE) [DE-SC0020295] Funding Source: U.S. Department of Energy (DOE)
Bicontinuous nanoporous metallic glasses combine the advantages of MGs and open-cell nanoporous materials. Molecular dynamics simulations of a bicontinuous nanoporous Cu64Zr36 MG with 55% porosity and 4.4 nm ligament size show anomalous mechanical behavior and the ability to effectively delocalize strain localization in MGs. This design may have potential applications in catalysis, sensors, and lightweight structural designs.
Bicontinuous nanoporous metallic glasses (MG) synergize the outstanding properties of MGs and opencell nanoporous materials. The low-density and high-specific-surface-area of bicontinuous nanoporous structures have the potential to enhance the applicability of MGs in catalysis, sensors, and lightweight structural designs. Here, we report molecular dynamics simulations of tensile loading deformation and failure of bicontinuous nanoporous Cu64Zr36 MG with 55% porosity and 4.4 nm ligament size. Results indicate an anomalous mechanical behavior featuring delocalized plastic deformation preceding ductile failure. The deformation follows two mechanisms: i) Necking of ligaments aligned with the loading direction and ii) progressive alignment of randomly oriented ligaments. Failure occurs at 0.16 strain, following massive rupture of ligaments. This work indicates that a bicontinuous nanoporous design is able to effectively delocalize strain localization in a MG due to a combination of size effect on the ductility of MGs resulting in nano ligaments necking and progressive asynchronous alignment of ligaments. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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