Beta-type titanium alloy having low elastic modulus and high strength

Abstract

Provided is a beta-type titanium alloy having a low elastic modulus and a high strength. The titanium alloy includes 6 to 13 wt % of Mo, 0.1 to 3.9 wt % of Fe, a remaining amount of Ti, and inevitable impurity, and selectively includes 0.1 to 3.9 wt % of Al. The titanium alloy according to the present invention has a high tensile strength of greater than or equal to 1,300 MPa and a low elastic modulus of less than or equal to 95 GPa at low cost.

1 . A beta-type titanium alloy having a low elastic modulus and a high strength, comprising 6 to 13 wt % of Mo, 0.1 to 3.9 wt % of Fe, a remaining amount of Ti, and inevitable impurity,
 the titanium alloy having a tensile strength of greater than or equal to 1,300 MPa and an elastic modulus of less than or equal to 95 GPa.   
     
     
         2 . The titanium alloy of  claim 1 , further comprising 0.1 to 3.9 wt % of Al. 
     
     
         3 . The titanium alloy of  claim 1 , wherein a microstructure of the beta-type titanium alloy has a dispersed shape of an omega phase having an average particle size of 100 nm or less. 
     
     
         4 . The titanium alloy of  claim 1 , wherein an Mo equivalent defined by following [Equation 1] is 7.0 to 20.0,
   Mo equivalent=[Mo]+1/5[Ta]+1/3.6[Nb]+1/2.5[W]+1/1.5[V]+1.25[Cr]+1.25[Ni]+1.7[Mn]+1.7[Co]+2.5[Fe].  [Equation 1]
   
     
     
         5 . The titanium alloy of  claim 1 , wherein an elongation percentage of the titanium alloy is greater than or equal to 6%. 
     
     
         6 . The titanium alloy of  claim 1 , wherein the tensile strength of the titanium alloy is greater than or equal to 1,400 MPa. 
     
     
         7 . A rod material manufactured by using the titanium alloy described in  claim 1 . 
     
     
         8 . A plate material manufactured by using the titanium alloy described in  claim 1 . 
     
     
         9 . A rectangular lumber material manufactured by using the titanium alloy described in  claim 1 . 
     
     
         10 . A spring material manufactured by using the titanium alloy described in  claim 1 .