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On the relationship between short-range structure and atomic dynamics in melts of glass-forming metallic alloys

Holland-Moritz, Dirk and Nowak, Benedikt and Yang, Fan and Voigtmann, Thomas and Hansen, Thomas and Evenson, Zachary and Meyer, Andreas (2019) On the relationship between short-range structure and atomic dynamics in melts of glass-forming metallic alloys. 17th International Conference on Liquid and Amorphous Metals (LAM-17), 26.-30. Aug. 2019, Lyon, Frankreich.

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Abstract

Despite considerable research effort, the mechanisms of glass-formation are not well understood on the atomic length and time scale. In this work results of studies on the short-range order and on the atomic dynamics in different stable and undercooled glass-forming metallic melts are presented. In order to undercool the melts deeply below the melting temperature and to avoid chemical reactions of the melts with crucible materials, the samples are containerlessly processed using the electromagnetic or the electrostatic levitation technique. For different glass-forming melts of Zr-Ni and Hf-Ni alloys full sets of partial structure factors were determined by neutron diffraction combined with an isotopic substitution technique [1,2], while Ni and Hf self-diffusion coefficients were measured as a function of temperature by quasielastic neutron scattering [2,3]. Similar as recently reported for Zr36Ni64 [4], a decoupling of the diffusion coefficients of the alloy components is observed for Hf35Ni65, showing that Ni diffuses faster than Hf. The relationship between short-range structure and atomic dynamics is discussed within the mode coupling theory. For ternary Hf10Zr25Ni65 melts pronounced deviations of the temperature dependence of the atomic dynamics from an Arrhenius behavior are observed, while the atomic dynamics can be accurately described by the scaling law of mode-coupling theory (MCT) with almost equal parameters for the self-diffusion and the viscosity [5]. Although the measured overall packing fraction remains almost unchanged, the dynamics in Hf10Zr25Ni65 are slower compared to Zr36Ni64. This corresponds also to a higher critical temperature Tc and might be induced by different chemical interactions in the melts. References: [1] B. Nowak, D. Holland-Moritz, F. Yang, Th. Voigtmann, et al., Physical Review Materials 1, 025603 (2017). [2] B. Nowak, D. Holland-Moritz, F. Yang, Th. Voigtmann, et al., Phys. Rev. B 96, 054201 (2017). [3] D. Holland-Moritz, S. Stüber, H. Hartmann, T. Unruh, and A. Meyer, J. Phys. Conf. Ser. 144, 012119 (2009). [4] S. W. Basuki, F. Yang, E. Gill, K. Rätzke, A. Meyer, and F. Faupel, Phys. Rev. B 95, 024301 (2017). [5] B. Nowak, D. Holland-Moritz, F. Yang, Z. Evenson, and A. Meyer, Phys. Rev. B 97, 094202 (2018).

Item URL in elib:https://elib.dlr.de/186135/
Document Type:Conference or Workshop Item (Speech)
Title:On the relationship between short-range structure and atomic dynamics in melts of glass-forming metallic alloys
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Holland-Moritz, DirkDirk.Holland-Moritz (at) dlr.deUNSPECIFIED
Nowak, BenediktBenedikt.Nowak (at) dlr.deUNSPECIFIED
Yang, FanFan.Yang (at) dlr.deUNSPECIFIED
Voigtmann, ThomasThomas.Voigtmann (at) dlr.deUNSPECIFIED
Hansen, Thomashansen (at) ill.euUNSPECIFIED
Evenson, ZacharyZachary.Evenson (at) dlr.deUNSPECIFIED
Meyer, AndreasAndreas.Meyer (at) dlr.deUNSPECIFIED
Date:August 2019
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Nahordnung in Schmelzen, Atomare Dynamik von Schmelzen, Glasbildende Schmelzen
Event Title:17th International Conference on Liquid and Amorphous Metals (LAM-17)
Event Location:Lyon, Frankreich
Event Type:international Conference
Event Dates:26.-30. Aug. 2019
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 - Research under Space Conditions
DLR - Research theme (Project):R - Materials Research and Microgravity (MuM)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Holland-Moritz, Dr.rer.nat. Dirk
Deposited On:19 Apr 2022 08:45
Last Modified:19 Apr 2022 08:45

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