Selective dissolution of nanolamellar Ti-41 at.% Al alloy single crystals

Yuichiro Koizumi, Atsushi Sugihara, Hiroaki Tsuchiya, Yoritoshi Minamino, Shinji Fujimoto, Hideyuki Yasuda, Masato Yoshiya

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

The selective dissolution behavior of Ti-41 at.% Al single crystals having a α2/γ-lamellar structure with a lamellar thickness in the range 20 nm to 1 μm have been investigated in 0.5 M NaCl aqueous solution focusing on the effect of lamellar thickness on the dissolution of γ-lamellae. In the case where γ-lamellae were thicker than ∼100 nm on average, γ-lamellae were selectively dissolved and, as a result, crevasses whose widths were close to the γ-lamellae thicknesses were formed. However, not all γ-lamellae were dissolved and the distribution of crevasses was much less uniform compared with that of the γ-lamellae. On the other hand, when the average γ-lamellae thickness was <100 nm relatively thick γ-lamellae were preferentially dissolved, but the distribution of the crevasses was relatively uniform compared with that obtained from the coarse lamellar structure. The reasons for this difference are discussed from the viewpoint of the absence of misfit dislocations in nanoscaled lamellae and the difference in ion transport through crevasses of different width formed by dissolution of γ-lamellae.

Original languageEnglish
Pages (from-to)2876-2886
Number of pages11
JournalActa Materialia
Volume58
Issue number8
DOIs
Publication statusPublished - 2010 May

Keywords

  • Corrosion
  • Electrochemistry
  • Multilayers
  • Nanostructure
  • Titanium aluminides

ASJC Scopus subject areas

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

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