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Partial structure factors reveal atomic dynamics in metallic alloy melts

Nowak, Benedikt and Holland-Moritz, Dirk and Yang, Fan and Voigtmann, Thomas and Kordel, Tobias and Hansen, T.C. and Meyer, Andreas (2017) Partial structure factors reveal atomic dynamics in metallic alloy melts. Physical Review Materials, 1 (2), 025603. American Physical Society. DOI: 10.1103/PhysRevMaterials.1.025603 ISSN 2475-9953

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Official URL: https://doi.org/10.1103/PhysRevMaterials.1.025603

Abstract

We investigate the dynamical decoupling of the diffusion coefficients of the different components in a metallic alloy melt, using a combination of neutron diffraction, isotopic substitution, and electrostatic levitation in Zr-Ni melts. We show that excess Ni atoms can diffuse more freely in a background of saturated chemical interaction, causing their dynamics to become much faster and thus decoupled than anticipated from the interparticle interactions. Based on the mode-coupling theory of the glass transition, the averaged structure as given by the partial static structure factors is able to explain the observed dynamical behavior.

Item URL in elib:https://elib.dlr.de/113917/
Document Type:Article
Title:Partial structure factors reveal atomic dynamics in metallic alloy melts
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Nowak, BenediktBenedikt.Nowak (at) dlr.deUNSPECIFIED
Holland-Moritz, DirkDirk.Holland-Moritz (at) dlr.deUNSPECIFIED
Yang, Fanfan.yang (at) dlr.deUNSPECIFIED
Voigtmann, Thomasthomas.voigtmann (at) dlr.deUNSPECIFIED
Kordel, Tobiastobias.kordel (at) dlr.deUNSPECIFIED
Hansen, T.C.institut laue-langevin, grenoble, frankreichUNSPECIFIED
Meyer, Andreasandreas.meyer (at) dlr.deUNSPECIFIED
Date:24 July 2017
Journal or Publication Title:Physical Review Materials
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:1
DOI :10.1103/PhysRevMaterials.1.025603
Page Range:025603
Publisher:American Physical Society
ISSN:2475-9953
Status:Published
Keywords:glass-forming metallic melts, diffusion, structural properties, neutron diffraction, mode-coupling theory
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Vorhaben Materialdesign und neue Materialien
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Nowak, Benedikt
Deposited On:18 Sep 2017 12:58
Last Modified:06 Sep 2019 14:49

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