Origins of the change in mechanical strength of silicon/gold nanocomposites during irradiation

Chen, Elton Y.; Hopper, Cameron P.; Santhapuram, Raghuram R.; Dingreville, Rémi; Nair, Arun K.

doi:10.1038/s41598-021-98652-y

Origins of the change in mechanical strength of silicon/gold nanocomposites during irradiation

Journal Article · Thu Sep 30 00:00:00 EDT 2021 · Scientific Reports

DOI:https://doi.org/10.1038/s41598-021-98652-y· OSTI ID:1823192

Chen, Elton Y.; Hopper, Cameron P.; Santhapuram, Raghuram R.; Dingreville, Rémi; Nair, Arun K.

Abstract

Silicon-based layered nanocomposites, comprised of covalent-metal interfaces, have demonstrated elevated resistance to radiation. The amorphization of the crystalline silicon sublayer during irradiation and/or heating can provide an additional mechanism for accommodating irradiation-induced defects. In this study, we investigated the mechanical strength of irradiated Si-based nanocomposites using atomistic modeling. We first examined dose effects on the defect evolution mechanisms near silicon-gold crystalline and amorphous interfaces. Our simulations reveal the growth of an emergent amorphous interfacial layer with increasing dose, a dominant factor mitigating radiation damage. We then examined the effect of radiation on the mechanical strength of silicon-gold multilayers by constructing yield surfaces. These results demonstrate a rapid onset strength loss with dose. Nearly identical behavior is observed in bulk gold, a phenomenon that can be rooted to the formation of radiation-induced stacking fault tetrahedra which dominate the dislocation emission mechanism during mechanical loading. Taken together, these results advance our understanding of the interaction between radiation-induced point defects and metal-covalent interfaces.

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Sponsoring Organization:: USDOE

OSTI ID:: 1823192

Alternate ID(s):: OSTI ID: 1831156

Journal Information:: Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 11; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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