Abstract
Sulfidation experiments of Ti-Al intermetallic compounds (Ti3Al, TiAl, and TiAl3) and pure titanium were carried out at 1073K and 1173K, and influence of aluminum content and sulfur partial pressure on the sulfidation amount was investigated. It was found that sulfidation amount decreases with increasing aluminum content. This is thought to be due to formation of Al2S3 in the scale and/or formation of the layer enriched with aluminum at the scale/alloy interface. It was shown that sulfidation amount decreases with decreasing of sulfur partial pressure. And then surface morphology changes from the fiber-like structure into the faceted structure with decreasing sulfur partial pressure. In the relatively low sulfur pressure and high aluminum content region, surface morphology shows fine granular or acicular structure.
