Submicron lamellar porous structure formed by selective dissolution of Ti-Al alloy

• Selective anodic dissolution of Ti-Al alloy with various lamellar structures has been investigated.
• The geometries of lamellar structures were variously changed by hot forging followed by ageing.
• As a result, high-aspect-ratio sub-micron-sized lamellar pores/gratings with various geometries were fabricated.

We created high-aspect-ratio sub-micron-sized lamellar porous structure by simple anodic selective dissolution of lamellar Ti-Al alloy in NaCl aqueous solution. The geometries of lamellar structures, which determined those of lamellar porous structure, were controlled by hot forging and subsequent ageing treatment before dissolution process. Although the changes in microstructure affected the selective dissolution behaviors, γ-TiAl phase could be dissolved selectively. As a result, the average sizes of unidirectional units of lamellar pores could be controlled in the range from to 25 μm to 500 μm. The pitches of the lamellar pores were controlled in the wide range from below 100 nm to over 1 μm.

Figure optionsDownload as PowerPoint slide