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Title: Diffusion phenomenon at the interface of Cu-brass under a strong gravitational field

To investigate diffusion phenomenon at the interface between Cu and brass under a strong gravitational field generated by ultracentrifuge apparatus, we performed gravity experiments on samples prepared by electroplating with interfaces normal and parallel to the direction of gravity. For the parallel-mode sample, for which sedimentation cannot occur thorough the interface, the concentration change was significant within the lower gravity region; many pores were observed in this region. Many vacancies arising from crystal strain due to the strong gravitational field moved into the lower gravity region, and enhanced the atoms mobilities. For the two normal-mode samples, which have interface normal to the direction of gravity, the composition gradient of the brass-on-Cu sample was steeper than that for Cu-on-brass. This showed that the atoms of denser Cu diffuse in the direction of gravity, whereas Zn atoms diffuse in the opposite direction by sedimentation. The interdiffusion coefficients became higher in the Cu-on-brass sample, and became lower in the brass-on-Cu sample. This rise may be related to the behavior of the vacancies.
Authors:
; ; ; ;  [1] ;  [2] ;  [3]
  1. Institute of Pulsed Power Science, Kumamoto University, Kumamoto 860-8555 (Japan)
  2. Department of Solid State Physics, Debrecen University, 4032 Debrecen (Hungary)
  3. Advanced Science Research Center, Japan Atomic Energy Agency (JAEA), Ibaraki 319-1195 (Japan)
Publication Date:
OSTI Identifier:
22399367
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 12; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ATOMS; BRASS; CONCENTRATION RATIO; CRYSTALS; DIFFUSION; ELECTROPLATING; GRAVITATIONAL FIELDS; INTERFACES; MOBILITY; SEDIMENTATION; STRAINS; ULTRACENTRIFUGES; VACANCIES; ZINC