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Nonequilibrium plastic roughening of metallic glasses yields self-affine topographies with strain-rate and temperature-dependent scaling exponents

Nöhring, Wolfram G.; Hinkle, Adam R. 1; Pastewka, Lars 1
1 Karlsruher Institut für Technologie (KIT)

Abstract:

We study nonequilibrium roughening during compressive plastic flow of initially flat Cu$_{50}$ Zr$_{50}$ metallic glass using large-scale molecular dynamics simulations. Roughness emerges at atomically flat interfaces beyond the yield point of the glass. A self-affine rough topography is imprinted at yield and is reinforced during subsequent deformation. The imprinted topographies have Hurst exponents that decrease with increasing strain rate and temperature. After yield, the root-mean-square roughness amplitude grows as the square root of the applied strain with a prefactor that also drops with increasing strain rate and temperature. Our calculations reveal the emergence of spatial power-law correlations from homogeneous samples during plastic flow with exponents that depend on the rate of deformation and the temperature. The results have implications for interpreting and engineering roughness profiles.


Verlagsausgabe §
DOI: 10.5445/IR/1000150299
Veröffentlicht am 01.09.2022
Originalveröffentlichung
DOI: 10.1103/PhysRevMaterials.6.075603
Scopus
Zitationen: 2
Web of Science
Zitationen: 2
Dimensions
Zitationen: 2
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Computational Materials Science (IAM-CMS)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 07.2022
Sprache Englisch
Identifikator ISSN: 2475-9953
KITopen-ID: 1000150299
Erschienen in Physical Review Materials
Verlag American Physical Society (APS)
Band 6
Heft 7
Seiten Art.-Nr.: 075603
Vorab online veröffentlicht am 21.07.2022
Nachgewiesen in Dimensions
Web of Science
Scopus
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