Abstract: A gas turbine includes a combustor, an air lead-out member, an outer peripheral cover portion, an inner peripheral cover portion, and a fuel supply unit. A lead-out port of the air lead-out member is located radially outward of one end portion of the combustor. The combustor has a guide wall portion which is formed so as to connect mutually-adjacent combustion cylinders and guides air from an air flow path to an inner space via a communication path. Through holes are formed in the outer peripheral surface of each of the combustion cylinders and open to the inner space to allow air in the inner space to flow into the downstream side of a combustion chamber.

Abstract: An Al alloy cast product includes 3.2% to 7.2% by weight of Mg and 0.28% to 0.6% by weight of Sc, and has an Fe content and an Si content, each of 0.1% by weight or less. The cast product contains, in the metal texture, 3% by volume or less of Al3Sc particle having a particle diameter of 100 nm or less. In production thereof, an Al alloy melt containing 3.2% to 7.2% by weight of Mg and 0.28% to 0.6% by weight of Sc and having an Fe content and an Si content, each of 0.1% by weight or less, is prepared. Next, a casting formed from the melt is subjected to an aging treatment without a solution heat treatment (or a quenching treatment). Then, 3% by volume or less of Al3Sc particle having a particle diameter of 100 nm or less is precipitated in the metal texture.

Abstract: An Al alloy cast product includes 3.2% to 7.2% by weight of Mg and 0.28% to 0.6% by weight of Sc, and has an Fe content and an Si content, each of 0.1% by weight or less. The cast product contains, in the metal texture, 3% by volume or less of Al3Sc particle having a particle diameter of 100 nm or less. In production thereof, an Al alloy melt containing 3.2% to 7.2% by weight of Mg and 0.28% to 0.6% by weight of Sc and having an Fe content and an Si content, each of 0.1% by weight or less, is prepared. Next, a casting formed from the melt is subjected to an aging treatment without a solution heat treatment (or a quenching treatment). Then, 3% by volume or less of Al3Sc particle having a particle diameter of 100 nm or less is precipitated in the metal texture.

Abstract: A Co-based alloy containing not less than 0.001 mass % and less than 0.100 mass % of C, not less than 9.0 mass % and less than 20.0 mass % of Cr, not less than 2.0 mass % and less than 5.0 mass % of Al, not less than 13.0 mass % and less than 20.0 mass % of W, and not less than 39.0 mass % and less than 55.0 mass % of Ni, with the remainder being made up by Co and unavoidable impurities, wherein the contents of Mo, Nb, Ti and Ta which are included in the unavoidable impurities are as follows: Mo<0.010 mass %, Nb<0.010 mass %, Ti<0.010 mass %, and Ta<0.010 mass %.