Oxide-dispersion-strengthened alloy

Abstract

The present invention provides an oxide dispersion strengthened alloy in which even with aluminum contained, the particle diameter and dispersion spacing of the oxide are decreased, and the strength at high temperature, the high temperature oxidation and the corrosion resistance can be improved. An oxide dispersion strengthened alloy being a nickel-base alloy containing aluminum, hafnium, and yttrium oxide, wherein a complex oxide of the yttrium oxide and hafnium oxide is dispersed in a matrix of the nickel-base alloy, with the aluminum contained.

1 . An oxide dispersion strengthened alloy being a nickel-base alloy comprising aluminum, hafnium, and yttrium oxide, wherein a complex oxide of the yttrium oxide and hafnium oxide is dispersed in a matrix of the nickel-base alloy, with the aluminum contained. 
     
     
         2 . The oxide dispersion strengthened alloy according to  claim 1 , wherein the complex oxide has an average particle diameter of 7 to 11 nm and an average dispersion spacing of 47 to 97 nm. 
     
     
         3 . The oxide dispersion strengthened alloy according to  claim 1 , comprising less than 2% of an aluminum element, 0.4 to 3.2% of a hafnium element, and 0.5 to 2.0% of yttrium oxide by weight. 
     
     
         4 . The oxide dispersion strengthened alloy according to  claim 1 , wherein a ratio of the number of molecules of yttrium oxide to the number of molecules of hafnium oxide is 1:0.5 to 1:4. 
     
     
         5 . The oxide dispersion strengthened alloy according to  claim 3 , comprising 0.5% of an aluminum element, 0.8% of a hafnium element, and 1% of yttrium oxide by weight. 
     
     
         6 . The oxide dispersion strengthened alloy according to  claim 4 , wherein the ratio of the number of molecules of yttrium oxide to the number of molecules of hafnium oxide is 1:1. 
     
     
         7 . The oxide dispersion strengthened alloy according to  claim 1 , further comprising 26% or less by weight of one or two or more elements selected from the group consisting of chromium, titanium, tantalum, tungsten, molybdenum, iron, zirconium, carbon, and boron.