Ti-Al金属間化合物の高温硫化挙動に及ぼすAl濃度と硫黄分圧の影響

抄録

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.