TY - JOUR

T1 - Unveiling the Local Atomic Arrangements in the Shear Band Regions of Metallic Glass

AU - Mu, Xiaoke

AU - Chellali, Mohammed Reda

AU - Boltynjuk, Evgeniy

AU - Gunderov, Dmitry

AU - Valiev, Ruslan Z.

AU - Hahn, Horst

AU - Kübel, Christian

AU - Ivanisenko, Yulia

AU - Velasco, Leonardo

N1 - Funding Information: X.M. and M.R.C. contributed equally to this work. The authors are grateful to the Karlsruhe Nano Micro Facility (KNMF) for support and access to APT, FIB, and TEM facilities. H.H., L.V., and X.M. acknowledge the financial support received from DFG grants HA 1344/38‐1 and MU 4276/1‐1. E.B., D.G., and R.Z.V. have performed these studies partially at Saint Petersburg State University in the framework of Call 3 project (id 26130576) and partially in the framework of the Russian Foundation for Basic Research (project No. 20‐03‐00614). The authors thank Quantum Detector Ltd for providing their medipix3 pixelated detector for this research. Publisher Copyright: © 2021 The Authors. Advanced Materials published by Wiley-VCH GmbH Copyright: Copyright 2021 Elsevier B.V., All rights reserved.

PY - 2021/3

Y1 - 2021/3

N2 - The prospective applications of metallic glasses are limited by their lack of ductility, attributed to shear banding inducing catastrophic failure. A concise depiction of the local atomic arrangement (local atomic packing and chemical short-range order), induced by shear banding, is quintessential to understand the deformation mechanism, however still not clear. An explicit view of the complex interplay of local atomic structure and chemical environment is presented by mapping the atomic arrangements in shear bands (SBs) and in their vicinity in a deformed Vitreloy 105 metallic glass, using the scanning electron diffraction pair distribution function and atom probe tomography. The results experimentally prove that plastic deformation causes a reduction of geometrically favored polyhedral motifs. Localized motifs variations and antisymmetric (bond and chemical) segregation extend for several hundred nanometers from the SB, forming the shear band affected zones. Moreover, the variations within the SB are found both perpendicular and parallel to the SB plane, also observable in the oxidation activity. The knowledge of the structural–chemical changes provides a deeper understanding of the plastic deformation of metallic glasses especially for their functional applications and future improvements.

AB - The prospective applications of metallic glasses are limited by their lack of ductility, attributed to shear banding inducing catastrophic failure. A concise depiction of the local atomic arrangement (local atomic packing and chemical short-range order), induced by shear banding, is quintessential to understand the deformation mechanism, however still not clear. An explicit view of the complex interplay of local atomic structure and chemical environment is presented by mapping the atomic arrangements in shear bands (SBs) and in their vicinity in a deformed Vitreloy 105 metallic glass, using the scanning electron diffraction pair distribution function and atom probe tomography. The results experimentally prove that plastic deformation causes a reduction of geometrically favored polyhedral motifs. Localized motifs variations and antisymmetric (bond and chemical) segregation extend for several hundred nanometers from the SB, forming the shear band affected zones. Moreover, the variations within the SB are found both perpendicular and parallel to the SB plane, also observable in the oxidation activity. The knowledge of the structural–chemical changes provides a deeper understanding of the plastic deformation of metallic glasses especially for their functional applications and future improvements.

KW - atom probe tomography

KW - bulk metallic glasses

KW - pair distribution function

KW - shear bands and affected zones

KW - STEM pair distribution function (STEM-PDF)

KW - atom probe tomography

KW - bulk metallic glasses

KW - pair distribution function

KW - shear bands and affected zones

KW - STEM pair distribution function (STEM-PDF)

KW - STEM pair distribution function (STEM&#8208

KW - PDF)

UR - http://www.scopus.com/inward/record.url?scp=85101020994&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/5c6a66c0-37a7-3acb-897a-4b8078506cab/

U2 - 10.1002/adma.202007267

DO - 10.1002/adma.202007267

M3 - Article

AN - SCOPUS:85101020994

VL - 33

SP - 1

EP - 10

JO - Advanced Materials

JF - Advanced Materials

SN - 0935-9648

IS - 12

M1 - 2007267

ER -