Deformation behavior of Al-rich metallic glasses under nanoindentation

To clarify the deformation behavior of Al-rich metallic glasses（MGs）, two kinds of Al-rich MGs（i.e. bulk and ribbon samples） with different frozen-in excess volume have been analyzed under nanoindentation.It was found that, with the decrease of frozen-in excess volume, the serration behavior becomes...

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Bibliographic Details
Published inJournal of materials science & technology Vol. 33; no. 11; pp. 1272 - 1277
Main Authors Guo, Hui, Jiang, Chuanbin, Yang, Baijun, Wang, Jianqiang
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.11.2017
Subjects
Free volume
Inhomogeneous deformation
Metallic glasses
Nanoindentation
Free volume
Metallic glasses
Inhomogeneous deformation
Nanoindentation
Online AccessGet full text
ISSN1005-0302
1941-1162
DOI10.1016/j.jmst.2016.10.014

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Summary:To clarify the deformation behavior of Al-rich metallic glasses（MGs）, two kinds of Al-rich MGs（i.e. bulk and ribbon samples） with different frozen-in excess volume have been analyzed under nanoindentation.It was found that, with the decrease of frozen-in excess volume, the serration behavior becomes inconspicuous together with the increase of hardness. Further, shear transformation zones（STZs）, related to the occurrence of shear banding, have been evaluated by different methods： the cooperative shearing model（CSM）, the rate-jump method（RJM） and the dynamic-mechanical response（DMR）. In contrast,the STZ volumes, calculated by the RJM, increase from 2.77 nm^3 in the bulk to 3.59 nm^3 in the ribbon,which are in good agreement with 2.60 nm^3 obtained from the icosahedral supercluster medium-range order structure model in Al-rich MGs. This result reflects that an intrinsic correlation exists between the formation of STZs and the medium-range orders（MROs）. Moreover, the variation trend of the STZ volume was analyzed in terms of the frozen-in excess volume content.
Bibliography:21-1315/TG
Metallic glasses Inhomogeneous deformation Free volume Nanoindentation
To clarify the deformation behavior of Al-rich metallic glasses（MGs）, two kinds of Al-rich MGs（i.e. bulk and ribbon samples） with different frozen-in excess volume have been analyzed under nanoindentation.It was found that, with the decrease of frozen-in excess volume, the serration behavior becomes inconspicuous together with the increase of hardness. Further, shear transformation zones（STZs）, related to the occurrence of shear banding, have been evaluated by different methods： the cooperative shearing model（CSM）, the rate-jump method（RJM） and the dynamic-mechanical response（DMR）. In contrast,the STZ volumes, calculated by the RJM, increase from 2.77 nm^3 in the bulk to 3.59 nm^3 in the ribbon,which are in good agreement with 2.60 nm^3 obtained from the icosahedral supercluster medium-range order structure model in Al-rich MGs. This result reflects that an intrinsic correlation exists between the formation of STZs and the medium-range orders（MROs）. Moreover, the variation trend of the STZ volume was analyzed in terms of the frozen-in excess volume content.
ISSN:1005-0302
1941-1162
DOI:10.1016/j.jmst.2016.10.014