High-melting superalloy and method of producing the same

Abstract

A high-melting superalloy made of iridium or rhodium or both thereof as a base and containing at least nickel together with at least one a metal selected from the metal group consisting of titanium, zirconium, hafnium, vanadium, niobium, and tantalum, wherein at least both phases of an fcc phase and an LI 2 phase are formed in the texture, and an amount of the LI 2 phase from 20 to 80% by volume.

1 - 8 . (Cancelled).  
     
     
         9 . A high-melting superalloy 
 comprising (A) from 5 to 65 atomic % of nickel and (B) from 5 to 20 atomic % of at least one metal selected from the group consisting of titanium, zirconium, hafnium, vanadium, niobium, and tantalum, with (C) from 30 to 75 atomic % of iridium or rhodium, or a mixture thereof, and    having a two-phase structure in which a L1 2  phase is precipitated in a matrix of a fcc phase, and an amount of the L1 2  phase is from 20 to 80% by volume.    
     
     
         10 . A high-melting superalloy 
 comprising (A) from 5 to 65 atomic % of nickel, (B) from 3 to 15 atomic % of at least one metal selected from the group consisting of titanium, zirconium, hafnium, vanadium, niobium, and tantalum, and (C) from 20 to 75 atomic % of iridium or rhodium, or a mixture thereof, with (D) from 4 to 13 atomic % of aluminium, and    having a two-phase structure in which a L1 2  phase is precipitated in a matrix of a fcc phase, and an amount of the L1 2  phase is from 20 to 80% by volume.    
     
     
         11 . A method of producing a high-melting superalloy as set forth in  claim 9 , which comprises compounding at least one of an iridium-base superalloy made of iridium as a base added with at least one metal selected from the metal group consisting of titanium, zirconium, hafnium, vanadium, niobium, and tantalum and a rhodium-base superalloy made of rhodium as a base added with at least one metal selected from the above-described metal group, with nickel, followed by ingoting to produce a high-melting superalloy.  
     
     
         12 . A method of producing a high-melting superalloy as set forth in  claim 9 , which comprises compounding at least one of an iridium-base superalloy made of iridium as a base added with at least one metal selected from the metal group consisting of titanium, zirconium, hafnium, vanadium, niobium, and tantalum and a rhodium-base superalloy made of rhodium as a base added with at least one metal selected from the above-described metal group, with a nickel-base alloy made of nickel as a base added with at least one metal selected from the above-described metal group, or aluminum, followed by ingoting to produce a high-melting superalloy.  
     
     
         13 . A method of producing a high-melting superalloy as set forth in  claim 10 , which comprises compounding at least one of an iridium-base superalloy made of iridium as a base added with at least one metal selected from the metal group consisting of titanium, zirconium, hafnium, vanadium, niobium, and tantalum and a rhodium-base superalloy made of rhodium as a base added with at least one metal selected from the above-described metal group, with nickel, followed by ingoting to produce a high-melting superalloy.  
     
     
         14 . A method of producing a high-melting superalloy as set forth in  claim 10 , which comprises compounding at least one of an iridium-base superalloy made of iridium as a base added with at least one metal selected from the metal group consisting of titanium, zirconium, hafnium, vanadium, niobium, and tantalum and a rhodium-base superalloy made of rhodium as a base added with at least one metal selected from the above-described metal group, with a nickel-base alloy made of nickel as a base added with at least one metal selected from the above-described metal group, or aluminum, followed by ingoting to produce a high-melting superalloy.