Atomic transfer through interfacial free volumes in Sn 65.4Bi34.6 eutectic systems

K. Sato, H. Murakami, K. Fujimoto, M. Nakata, T. Oka, Y. Kobayashi

研究成果: Article査読

5 被引用数 (Scopus)


Atomic transfer through the interfaces upon Bi precipitation is specifically investigated with respect to vacancy-sized free volumes for a Sn65.4Bi34.6 eutectic alloy of a highly heterogeneous system by making full use of backscattering electron imaging, small-angle x-ray scattering, x-ray diffraction, and positron annihilation spectroscopy. Bi-rich particles of ∼100nm with segregated nanocrystallites of ∼30nm are observed for the alloy cooled at a cooling rate of 10-1Ks -1. Bi particles and nanocrystallites intergrow with each other up to ∼1νm and ∼55nm, respectively, by an extremely slow cooling of 10-5Ks-1. Regardless of the cooling rate, high concentrations of vacancy-sized free volumes are found to be located at interfaces among short-range ordered phases. For the alloy cooled at 10 -1Ks-1, the free volumes are dominantly surrounded by Bi atoms. Decreasing the cooling rate down to 10-5Ks-1 changes the free volumes with Bi-rich chemical surroundings to an Sn-rich environment, which directly indicates atomic transfer through the interfaces upon Bi precipitation. The present results demonstrate that the kinetics of vacancy-sized free volumes in the interfaces plays an important role in understanding the precipitation mechanism in nanostructured heterogeneous materials.

ジャーナルJournal of Physics Condensed Matter
出版ステータスPublished - 2008 10月 1

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学


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