Size distribution of precipitated Ni clusters on the surface of an alkaline-treated LaNi5-based alloy

H. W. Li, K. Ikeda, Y. Nakamori, S. Orimo, K. Yakushiji, K. Takanashi, H. Ohyama, K. Nakatsuji, Y. Dansui

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The size distributions of precipitated Ni clusters on the surface of a LaNi5-based alloy immersed in alkaline solution (alkaline treatment) at 383 K for 0-110 min were precisely determined by combining superparamagnetic analysis and transmission electron microscopy (TEM) observations. The superparamagnetic analysis indicated that the diameters of the Ni clusters were smaller than ∼25 nm in all samples, while their average values increased approximately from 5 to 9 nm with increasing alkaline treatment time. The spatial distribution of the Ni clusters was successively observed by TEM, which agreed fairly well with the estimated size distribution by superparamagnetic analysis. Therefore, estimation of the actual size distribution of Ni clusters by superparamagnetic analysis was proved to be feasible. Based on the above results, a precipitation process for Ni clusters by alkaline treatment is proposed.

Original languageEnglish
Pages (from-to)481-485
Number of pages5
JournalActa Materialia
Issue number2
Publication statusPublished - Jan 1 2007
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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