Nb-Si-BASED HIGH-TEMPERATURE ALLOY

摘要

PROBLEM TO BE SOLVED: To provide a material which is excellent in high-temperature strength and room-temperature toughness, in which precision casting and directional solidification can be applied, and which is easily hot worked.;SOLUTION: The niobium-based high-temperature alloy includes 9.0 to 17.5 atom% Si and 1 atom% or more and a solid-solution limit or less of one or more elements selected from the group consisting of Au, Pd, Re, Os, Ir, and Pt, with the balance consisting of inevitable impurities and niobium, and has a Nb/Nb₅Si₃ eutectic structure in which spheroidized Nb₅Si₃ particles are dispersed in a Nb base material phase. In the niobium-based high-temperature alloy, the amount of displacement by a 1,200°C high-temperature three-point bending test is 1,500 μm or more. The niobium-based high-temperature alloy can be produced by a method including: a melting step of melting a raw material metal component; a solidification step of solidifying the molten material obtained by the melting step; and a heat treatment step of heat-treating the solidified material with a lamellar structure comprising Nb and Nb₅Si₃ obtained by the solidification step at 1,100 to 1,700°C in a solid state to spheroidize the Nb₅Si₃.;COPYRIGHT: (C)2013,JPO&INPIT