Lamellar-structure titanium-aluminum based alloy having a beta-gamma phase

Abstract

A lamellar titanium-aluminium (TiAl) alloy having a beta-gamma phase according to the present invention contains aluminum (Al) of 40˜46 at %, niobium (Nb) of 3˜6 at %, a creep resistance enhancer of 0.2˜0.4 at %, a softening resistance enhancer of 2 at %, and the balance of titanium (Ti) and is manufactured by vacuum arc melting.

1 . A lamellar titanium-aluminum (TiAl) alloy having a beta-gamma phase that contains aluminum (Al) of 40˜46 at %, niobium (Nb) of 3˜6 at %, a creep resistance enhancer of 0.2˜0.4 at %, a softening resistance enhancer of 1˜3 at %, and the balance of titanium (Ti) and is manufactured by solid-casting to improve softening resistance and creep resistance. 
     
     
         2 . The lamellar titanium-aluminum (TiAl) alloy of  claim 1 , wherein the creep resistance enhancer includes one or more of carbon (C) and silicon (Si). 
     
     
         3 . The lamellar titanium-aluminum (TiAl) alloy of  claim 2 , wherein the softening resistance enhancer is any one selected from tungsten (W) and chromium (Cr). 
     
     
         4 . The lamellar titanium-aluminum (TiAl) alloy of  claim 3 , wherein average hardness is 335.6 Hv or more. 
     
     
         5 . The lamellar titanium-aluminum (TiAl) alloy of  claim 1 , wherein Young's modulus is 180˜220 GPa. 
     
     
         6 . The lamellar titanium-aluminum (TiAl) alloy of  claim 5 , wherein tensile strength is 453.8˜540 MPa. 
     
     
         7 . The lamellar titanium-aluminum (TiAl) alloy of  claim 2 , wherein Young's modulus is 180˜220 GPa. 
     
     
         8 . The lamellar titanium-aluminum (TiAl) alloy of  claim 3 , wherein Young's modulus is 180˜220 GPa. 
     
     
         9 . The lamellar titanium-aluminum (TiAl) alloy of  claim 4 , wherein Young's modulus is 180˜220 GPa.