Abstract
A novel hierarchical nano-porous structure with laminated and tubular pores was fabricated by two step method in which selective dissolution of lamellar Ti-40 at.% Al alloy was followed by anodization. In the first step, grating structure consisting of α2-Ti3Al lamellae and crevasses was produced by selective dissolution of γ lamellae from the lamellar alloy. The spacing of gratings was controlled close to visible light wavelength. In the second step, the gratings were anodized and hierarchical porous structure consisting of nano-laminated crevasse and nano pores was formed. The XPS result indicates that the porous structure consists of oxide and hydroxide containing Ti and Al with a molar proportion of 1.5:1. The self-organized pores were homogeneous with a diameter of approximately 20 nm, the depth of pores is 100~200 nm. The dimensions of gratings and pores can be tuned with the combination of alloy composition and conditions of heat treatment, selective dissolution, and anodization.
| Original language | English |
|---|---|
| Pages (from-to) | 15-18 |
| Number of pages | 4 |
| Journal | Materials Letters |
| Volume | 145 |
| DOIs | |
| Publication status | Published - 2015 Apr 15 |
Keywords
- Anodization
- Hierarchical structure
- Laminated pore
- Nanoarchitecture
- Selective dissolution
- Titanium aluminides
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering