Molecular dynamics simulation on the mechanical properties of Zr-Cu metallic nanoglasses with heterogeneous chemical compositions
The mechanical properties of metallic nanoglasses (NGs) strongly depend on the average size of glassy grains (D avg ). Nevertheless, current knowledge on the effects of sizes of glassy grains is incomplete for the mechanical properties of NGs. Herein, Zr x Cu 100-x (25 ≤ x ≤ 75) nanoglasses containi...
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Published in | Frontiers in materials Vol. 11 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Frontiers Media S.A
16.02.2024
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Subjects | |
Online Access | Get full text |
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Summary: | The mechanical properties of metallic nanoglasses (NGs) strongly depend on the average size of glassy grains (D
avg
). Nevertheless, current knowledge on the effects of sizes of glassy grains is incomplete for the mechanical properties of NGs. Herein, Zr
x
Cu
100-x
(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
avg
is determined. Specifically, the UTS decreases with decreasing D
avg
in Zr-Cu HNGs when D
avg
< 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
avg
> 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. |
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ISSN: | 2296-8016 2296-8016 |
DOI: | 10.3389/fmats.2024.1355522 |