Titanium-aluminum-based alloy

Abstract

The present invention relates to A titanium-aluminum-based alloy comprising: 40 to 46 at % of aluminum (Al); 3 to 6 at % of niobium (Nb); 0.3 to 0.5 at % of creep-property enhancer; at least any one of 1 to 3 at % of tungsten (W) and 1 to 3 at % of chrome (Cr); and the balance of titanium (Ti), wherein the creep-property enhancer comprises silicon (Si) and boron (B), wherein the boron is added at 0.05 to 0.2 at %.

What is claimed is: 
     
         1 . A titanium-aluminum-based alloy comprising:
 40 to 46 at % of aluminum (Al);   3 to 6 at % of niobium (Nb);   0.3 to 0.5 at % of creep-property enhancer;   at least any one of 1 to 3 at % of tungsten (W) and 1 to 3 at % of chrome (Cr); and   the balance of titanium (Ti),   wherein the creep-property enhancer comprises silicon (Si) and boron (B), wherein the boron is added at 0.05 to 0.2 at %.   
     
     
         2 . The titanium-aluminum-based alloy of  claim 1 , wherein the creep-property enhancer further comprises carbon (C), in which case the sum of contents of the boron and the carbon is in a range of 0.05 to 0.2 at %. 
     
     
         3 . The titanium-aluminum-based alloy of  claim 1 , having a lamellar structure in which a α2 phase and a γ phase are regularly and sequentially arranged, wherein a width ratio of the α2 phase and the γ phase is in a range of 2.17 to 2.22.