Evidence of Highly Collective Co Diffusion in the Whole Stability Range of Co-Zr Glasses

Heesemann, A.; Zöllmer, Volker; Rätzke, Klaus; Faupel, Franz

doi:10.1103/physrevlett.84.1467

Cited by 36 publications

(15 citation statements)

References 41 publications

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“…Overall, a prototypical diffusive event in GBs is a collective displacement of an atomic chain (string) in which the head atom fills a relatively open space (free volume) while the trailing atom leaves a similar open space behind [550,601]. There is an intriguing similarity between diffusion mechanisms in GBs and diffusion in supercooled liquids [602] and metallic glasses [603].…”

Section: Grain Boundary Diffusionmentioning

confidence: 99%

Atomistic modeling of interfaces and their impact on microstructure and properties

2010

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Atomic-level modeling of materials provides fundamental insights into phase stability, structure and properties of crystalline defects, and to physical mechanisms of many processes ranging from atomic diffusion to interface migration. This knowledge often serves as a guide for the development of mesoscopic and macroscopic continuum models, with input parameters provided by atomistic models. This paper gives an overview of the most recent developments in the area of atomistic modeling with emphasis on interfaces and their impact on microstructure and properties of materials. Modern computer simulation methodologies are discussed and illustrated by several applications related to thermodynamic, kinetic and mechanical properties of materials. Existing challenges and future research directions in this field are outlined.

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Section: Grain Boundary Diffusionmentioning

confidence: 99%

Atomistic modeling of interfaces and their impact on microstructure and properties

2010

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“…14 Isotope effect measurements in conventional metallic glasses have yielded almost vanishing E values, indicative of highly collecting hopping processes typically involving more then ten atoms. 15 Based on molecular-dynamics simulations, chainlike displacements of atoms, which seem to be closely related to the well-known low-frequency excitations in glasses, were suggested. 3,16 Isotope effect measurements are also available for the supercooled liquid state in one of the bulk metallic glasses.…”

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Evidence of diffusion via collective hopping in metallic supercooled liquids and glasses

et al. 2002

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We report on measurements of the mass dependence ͑isotope effect E͒ of Co diffusion in both the glassy as well as the supercooled liquid states in a Pd 40 Cu 30 Ni 10 P 20 glass. The isotope effect, which is a fingerprint of the diffusion mechanism, is very small ͑Ͻ0.1͒ in both states, suggesting diffusion via highly collective hopping. In particular, E does not change upon isothermal relaxation from the glassy into the supercooled liquid state. Our results lend strong support to the view that even after macroscopic softening of a glass the underlying atomic transport mechanism is still solidlike thermally activated hopping in a considerable temperature range above the caloric glass transition temperature.

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“…In contrast, diffusion in the glassy state is solidlike; i.e., it takes place by thermally activated local hopping events over frozen-in barriers. Isotope effect measurements [4,5] and molecular dynamic simulations [6,7] suggest diffusion in metallic glasses to occur by highly collective jumps involving many atoms. The transition from the liquid to the glassy state has often been described as a thermodynamic phenomenon [8].…”

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Diffusion in a Metallic Melt at the Critical Temperature of Mode Coupling Theory

et al. 2003

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According to mode coupling theory, liquidlike motion becomes frozen at a critical temperature T(c) well above the caloric glass transition temperature T(g). Here, for the first time, we report on radiotracer diffusion in a supercooled Pd43Cu27Ni10P20 alloy from T(g) to the equilibrium melt. Liquidlike motion is seen to set in exactly above T(c) as evidenced by a gradual drop of the effective activation energy. This strongly supports the mode coupling scenario. Isotope effect measurements, which have never been carried out near T(c) in any material, show atomic transport up to the equilibrium melt to be far away from the hydrodynamic regime of uncorrelated binary collisions.

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Evidence of Highly Collective Co Diffusion in the Whole Stability Range of Co-Zr Glasses

Abstract: Using a radiotracer technique, we have measured the isotope effect E = dln(D)/dln(m(1/2)) of Co diffusion in CoxZr1-x glasses for 0. 31

Cited by 36 publications

References 41 publications

Atomistic modeling of interfaces and their impact on microstructure and properties

Atomistic modeling of interfaces and their impact on microstructure and properties

Evidence of diffusion via collective hopping in metallic supercooled liquids and glasses

Diffusion in a Metallic Melt at the Critical Temperature of Mode Coupling Theory

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