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

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...

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Autores principales:	Elton Y. Chen, Cameron P. Hopper, Raghuram R. Santhapuram, Rémi Dingreville, Arun K. Nair
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/11c0a6f284d542c09302fca0b664d055
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spelling	oai:doaj.org-article:11c0a6f284d542c09302fca0b664d0552021-12-02T17:37:41ZOrigins of the change in mechanical strength of silicon/gold nanocomposites during irradiation10.1038/s41598-021-98652-y2045-2322https://doaj.org/article/11c0a6f284d542c09302fca0b664d0552021-09-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-98652-yhttps://doaj.org/toc/2045-2322Abstract 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.Elton Y. ChenCameron P. HopperRaghuram R. SanthapuramRémi DingrevilleArun K. NairNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Elton Y. Chen Cameron P. Hopper Raghuram R. Santhapuram Rémi Dingreville Arun K. Nair Origins of the change in mechanical strength of silicon/gold nanocomposites during irradiation
description	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.
format	article
author	Elton Y. Chen Cameron P. Hopper Raghuram R. Santhapuram Rémi Dingreville Arun K. Nair
author_facet	Elton Y. Chen Cameron P. Hopper Raghuram R. Santhapuram Rémi Dingreville Arun K. Nair
author_sort	Elton Y. Chen
title	Origins of the change in mechanical strength of silicon/gold nanocomposites during irradiation
title_short	Origins of the change in mechanical strength of silicon/gold nanocomposites during irradiation
title_full	Origins of the change in mechanical strength of silicon/gold nanocomposites during irradiation
title_fullStr	Origins of the change in mechanical strength of silicon/gold nanocomposites during irradiation
title_full_unstemmed	Origins of the change in mechanical strength of silicon/gold nanocomposites during irradiation
title_sort	origins of the change in mechanical strength of silicon/gold nanocomposites during irradiation
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/11c0a6f284d542c09302fca0b664d055
work_keys_str_mv	AT eltonychen originsofthechangeinmechanicalstrengthofsilicongoldnanocompositesduringirradiation AT cameronphopper originsofthechangeinmechanicalstrengthofsilicongoldnanocompositesduringirradiation AT raghuramrsanthapuram originsofthechangeinmechanicalstrengthofsilicongoldnanocompositesduringirradiation AT remidingreville originsofthechangeinmechanicalstrengthofsilicongoldnanocompositesduringirradiation AT arunknair originsofthechangeinmechanicalstrengthofsilicongoldnanocompositesduringirradiation
_version_	1718379866359857152

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

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