Investigations on Self- and Interdiffusion in Liquid Metals

Frohberg, G.; Kraatz, Kurt Helmut; Wever, H.

doi:10.4028/www.scientific.net/msf.15-18.529

Cited by 27 publications

(19 citation statements)

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“…The low E-values in the equilibrium melt, however, show that the present Pd-Cu-Ni-P melt is still far away from the hydrodynamic regime of uncorrelated binary collisions. This is in strong contrast to simple melts such as liquid Sn, which shows a rather large isotope effect [34]. Molecular dynamics simulations indicate a strong correlation of isotope effect and density of the liquid.…”

Section: Cobalt Diffusion and Isotope Effectmentioning

confidence: 83%

Diffusion in bulk-metallic glass-forming Pd–Cu–Ni–P alloys: From the glass to the equilibrium melt

Rätzke¹,

Zöllmer²,

Bartsch³

et al. 2007

Journal of Non-Crystalline Solids

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Section: Cobalt Diffusion and Isotope Effectmentioning

confidence: 83%

Diffusion in bulk-metallic glass-forming Pd–Cu–Ni–P alloys: From the glass to the equilibrium melt

Rätzke¹,

Zöllmer²,

Bartsch³

et al. 2007

Journal of Non-Crystalline Solids

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“…A µg experiment on liquid Sn revealed that well above the melting point convection even dominates the mass transport [40]. The µg data in liquid Sn obey D ∝ T 2 for temperatures between T m and 2 × T m .…”

Section: Diffusionmentioning

confidence: 95%

“…A vanishing isotope effect indicates a collective transport mechanism involving a large number of atoms. In liquid Sn an isotope effect of about 0.4 has been reported, that is increasing with increasing temperature [40]. MD simulations on a binary Lennard-Jones liquid demonstrate that changes in the density in the order of 20 % only result in a continuous increase in E from 0 to ≃ 0.3 [47].…”

Section: E Atomic Transport Mechanismmentioning

confidence: 99%

Atomic transport in dense multicomponent metallic liquids

Meyer

2002

Phys. Rev. B

119

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Pd43Ni10Cu27P20 has been investigated in its equilibrium liquid state with incoherent, inelastic neutron scattering. As compared to simple liquids, liquid PdNiCuP is characterized by a dense packing with a packing fraction above 0.5. The intermediate scattering function exhibits a fast relaxation process that precedes structural relaxation. Structural relaxation obeys a time-temperature superposition that extends over a temperature range of 540 K. The mode-coupling theory of the liquid to glass transition (MCT) gives a consistent description of the dynamics which governs the mass transport in liquid PdNiCuP alloys. MCT scaling laws extrapolate to a critical temperature Tc at about 20 % below the liquidus temperature. Diffusivities derived from the mean relaxation times compare well with Co diffusivities from recent tracer diffusion measurements and diffsuivities calculated from viscosity via the Stokes-Einstein relation. In contrast to simple metallic liquids, the atomic transport in dense, liquid Pd43Ni10Cu27P20 is characterized by a drastical slowing down of dynamics on cooling, a q −2 dependence of the mean relaxation times at intermediate q and a vanishing isotope effect as a result of a highly collective transport mechanism. At temperatures as high as 2×Tc diffusion in liquid Pd43Ni10Cu27P20 is as fast as in simple liquids at the melting point. However, the difference in the underlying atomic transport mechanism indicates that the diffusion mechanism in liquids is not controlled by the value of the diffusivity but rather by that of the packing fraction.

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“…As has been shown by comparison of LC diffusion experiments on ground with experiments under microgravity conditions in space on liquid Sn [5,11], or with QNS measurements on liquid Cu [12], resulting LC values on ground are systematically larger by several 10% to 100%. The concentration profiles obtained on the Al-Cu systems measured here in situ do not show obvious influences of convective flow.…”

mentioning

confidence: 87%

Diffusion in Al-Cu Melts Studied by Time-Resolved X-Ray Radiography

2010

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We use time-resolved x-ray radiography in order to monitor interdiffusion processes in situ in liquid alloys. We measure temperature and composition dependent interdiffusion coefficients (D{AlCu}) in Al-rich Al-Cu melts. At constant temperature, D{AlCu} only exhibits a weak dependence of the alloy composition. As compared to self-diffusion, interdiffusion is enhanced by a factor of about 3. Our results demonstrate that it is not possible to express interdiffusion in terms of self-diffusion and thermodynamic driving forces.

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Investigations on Self- and Interdiffusion in Liquid Metals

Cited by 27 publications

References 0 publications

Diffusion in bulk-metallic glass-forming Pd–Cu–Ni–P alloys: From the glass to the equilibrium melt

Diffusion in bulk-metallic glass-forming Pd–Cu–Ni–P alloys: From the glass to the equilibrium melt

Atomic transport in dense multicomponent metallic liquids

Diffusion in Al-Cu Melts Studied by Time-Resolved X-Ray Radiography

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