TiAl ALLOY, TiAl ALLOY POWDER, TiAl ALLOY COMPONENT, AND PRODUCTION METHOD OF THE SAME

Abstract

A TiAl alloy is provided with 47 at % or more and 50 at % or less of Al, 1 at % or more and 2 at % or less of Nb, 2 at % or more and 5 at % or less of Zr, 0.05 at % or more and 0.3 at % or less of B, and the balance being Ti and inevitable impurities.

What is claimed is: 
     
         1 . A TiAl alloy comprising:
 47 at % or more and 50 at % or less of Al;   1 at % or more and 2 at % or less of Nb;   2 at % or more and 5 at % or less of Zr;   0.05 at % or more and 0.3 at % or less of B; and   the balance being Ti and inevitable impurities.   
     
     
         2 . The TiAl alloy as recited in  claim 1 , wherein the content of Al is 47 at % or more and 49 at % or less. 
     
     
         3 . The TiAl alloy as recited in  claim 1 , wherein
 the content of Nb is 1 at %,   the content of Al is 47 at % or more and 48 at % or less, and   the content of Zr is 2 at % or more and 4 at % or less.   
     
     
         4 . The TiAl alloy as recited in  claim 1 , wherein
 the content of Nb is 1 at %,   the content of Al is 47 at % or more and 49 at % or less, and   the content of Zr is 2 at % or more and 3 at % or less.   
     
     
         5 . The TiAl alloy as recited in  claim 1 , wherein
 the content of Nb is 2 at %,   the content of Al is 47 at % or more and 49 at % or less, and   the content of Zr is 2 at % or more and 3 at % or less.   
     
     
         6 . The TiAl alloy as recited in  claim 1 , wherein
 the content of Nb is 2 at %,   the content of Al is 47 at % or more and 48 at % or less, and   the content of Zr is 2 at % or more and 4 at % or less.   
     
     
         7 . The TiAl alloy as recited in  claim 1 , wherein
 the content of Al is 47 at % or more and 48 at % or less, and   the content of Zr is 2 at % or more and 4 at % or less.   
     
     
         8 . The TiAl alloy as recited in  claim 1 , wherein
 the content of Al is 47 at % or more and 48 at % or less, and   the content of Zr is 2 at % or more and 3 at % or less.   
     
     
         9 . The TiAl alloy as recited in  claim 1 , wherein a room temperature ultimate tensile strength is 600 MPa or more, and a room temperature tensile fracture strain is 1.2% or more. 
     
     
         10 . A TiAl alloy powder formed of the TiAl alloy as recited in  claim 1 . 
     
     
         11 . A TiAl alloy component formed of the TiAl alloy as recited in  claim 1 . 
     
     
         12 . A production method of a TiAl alloy component, comprising:
 a sealing step of filling a metal sheath with a TiAl alloy powder formed of the TiAl alloy as recited in  claim 1 ; and   a hot isostatic pressure step of treating the TiAl alloy powder sealed in the metal sheath with a hot isostatic pressure treatment under 1.200 degrees C. or higher and 1300 degrees C. or lower and 150 MPa.