Hardening of shear band in metallic glass

Abstract Strain hardening, originating from defects such as the dislocation, avails conventional metals of high engineering reliability in applications. However, the hardenability of metallic glass is a long-standing concern due to the lack of similar defects. In this work, we carefully examine the...

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Autores principales:	J. G. Wang, Y. C. Hu, P. F. Guan, K. K. Song, L. Wang, G. Wang, Y. Pan, B. Sarac, J. Eckert
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/13076330d8a341f1899d3d3d522fe089
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spelling	oai:doaj.org-article:13076330d8a341f1899d3d3d522fe0892021-12-02T12:32:51ZHardening of shear band in metallic glass10.1038/s41598-017-07669-92045-2322https://doaj.org/article/13076330d8a341f1899d3d3d522fe0892017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-07669-9https://doaj.org/toc/2045-2322Abstract Strain hardening, originating from defects such as the dislocation, avails conventional metals of high engineering reliability in applications. However, the hardenability of metallic glass is a long-standing concern due to the lack of similar defects. In this work, we carefully examine the stress-strain relationship in three bulk monolithic metallic glasses. The results show that hardening is surely available in metallic glasses if the effective load-bearing area is considered instantly. The hardening is proposed to result from the remelting and ensuing solidification of the shear-band material under a hydrostatic pressure imposed by the normal stress during the shear banding event. This applied-pressure quenching densifies the metallic glass by discharging the free volume. On the other hand, as validated by molecular dynamics simulations, the pressure promotes the icosahedral short-range order. The densification and icosahedral clusters both contribute to the increase of the shear strength and therefore the hardening in metallic glasses.J. G. WangY. C. HuP. F. GuanK. K. SongL. WangG. WangY. PanB. SaracJ. EckertNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q J. G. Wang Y. C. Hu P. F. Guan K. K. Song L. Wang G. Wang Y. Pan B. Sarac J. Eckert Hardening of shear band in metallic glass
description	Abstract Strain hardening, originating from defects such as the dislocation, avails conventional metals of high engineering reliability in applications. However, the hardenability of metallic glass is a long-standing concern due to the lack of similar defects. In this work, we carefully examine the stress-strain relationship in three bulk monolithic metallic glasses. The results show that hardening is surely available in metallic glasses if the effective load-bearing area is considered instantly. The hardening is proposed to result from the remelting and ensuing solidification of the shear-band material under a hydrostatic pressure imposed by the normal stress during the shear banding event. This applied-pressure quenching densifies the metallic glass by discharging the free volume. On the other hand, as validated by molecular dynamics simulations, the pressure promotes the icosahedral short-range order. The densification and icosahedral clusters both contribute to the increase of the shear strength and therefore the hardening in metallic glasses.
format	article
author	J. G. Wang Y. C. Hu P. F. Guan K. K. Song L. Wang G. Wang Y. Pan B. Sarac J. Eckert
author_facet	J. G. Wang Y. C. Hu P. F. Guan K. K. Song L. Wang G. Wang Y. Pan B. Sarac J. Eckert
author_sort	J. G. Wang
title	Hardening of shear band in metallic glass
title_short	Hardening of shear band in metallic glass
title_full	Hardening of shear band in metallic glass
title_fullStr	Hardening of shear band in metallic glass
title_full_unstemmed	Hardening of shear band in metallic glass
title_sort	hardening of shear band in metallic glass
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/13076330d8a341f1899d3d3d522fe089
work_keys_str_mv	AT jgwang hardeningofshearbandinmetallicglass AT ychu hardeningofshearbandinmetallicglass AT pfguan hardeningofshearbandinmetallicglass AT kksong hardeningofshearbandinmetallicglass AT lwang hardeningofshearbandinmetallicglass AT gwang hardeningofshearbandinmetallicglass AT ypan hardeningofshearbandinmetallicglass AT bsarac hardeningofshearbandinmetallicglass AT jeckert hardeningofshearbandinmetallicglass
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Hardening of shear band in metallic glass

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