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

Yudai Ogata, Yusuke Iguchi, Makoto Tokuda, Kamila Januszko, Jahirul Islam Khandaker, Masao Ono, Tsutomu Mashimo

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number125902
JournalJournal of Applied Physics
Volume117
Issue number12
DOIs
Publication statusPublished - 2015 Mar 28
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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