Abstract
Three kinds of Ni-based single crystals with the compositions of 63.8Ni-7.5Cr-5.1Co-4.8Al-1.9Mo- 0.9Ti-3Re-11.8Ta-1.2W, 61.4Ni-7.4Cr-5Co-4.8Al-1.8Mo-0.9Ti-3.1Re-11.6Ta-4W, and 60.9Ni-7.5Cr-5Co-4.8Al- 2Mo-1Ti-2.9Re-10.9Ta-1.2W-3.8Ru, in wt%, were cast in a Bridgman furnace. In the cast alloys, Cr, Co, Re, Mo, W, and Ru became microsegregated in dendrites consisting of γ-Ni, while Ni, Ta, and Al microsegregated in interdendrites..... More

Abstract
Cast Ti–44Al–6Nb–2Cr–0.3Si–0.1C alloy having good air-oxidation resistance was corroded under 1 atm of flowing 0.2%SO₂/Ar gas at 900-1100 ^oC for 50-300 h in order to examine its corrosion behavior in a SO₂-containing environment, because SO₂ is an industrially important by-product in the field of combustion and processing of fossil fuels...... More