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Molecular dynamics simulation on the mechanical properties of Zr-Cu metallic nanoglasses with heterogeneous chemical compositions.

Authors :
Tian Li
Nana Li
Bo Kuang
Guangping Zheng
Source :
Frontiers in Materials; 2024, p01-09, 9p
Publication Year :
2024

Abstract

The mechanical properties of metallic nanoglasses (NGs) strongly depend on the average size of glassy grains (D<subscript>avg</subscript>). Nevertheless, current knowledge on the effects of sizes of glassy grains is incomplete for the mechanical properties of NGs. Herein, Zr<subscript>x</subscript>Cu<subscript>100-x</subscript> (25 ≤ x ≤ 75) nanoglasses containing glassy grains with different chemical compositions, i.e., the heterogeneous NGs (HNGs), are investigated by molecular dynamics simulation, and the relation between ultimate tensile strength (UTS) and D<subscript>avg</subscript> is determined. Specifically, the UTS decreases with decreasing D<subscript>avg</subscript> in Zr-Cu HNGs when D<subscript>avg</subscript> < 10 nm, mainly resulting from the increased volume fraction of glass-glass interfaces, while UTS would follow the Hall-Petch like relation for Zr-Cu HNGs when D<subscript>avg</subscript> > 10 nm, which is closely related to glassy grains with compositions dominated by Zr atoms. This study provides a deep insight into the mechanical property dependence on grain size in the HNGs, which could be a novel strategy in resolving the issue of strength-ductility tradeoff in NGs. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
22968016
Database :
Complementary Index
Journal :
Frontiers in Materials
Publication Type :
Academic Journal
Accession number :
175776027
Full Text :
https://doi.org/10.3389/fmats.2024.1355522