Low density titanium alloy, golf club head, and process for prouducing low density titanium alloy part

Abstract

The present invention relates to a low density titanium alloy, containing: 7.1 to 10.0 mass % of Al; 0.1 to 3.0 mass % of Fe; 0.01 to 0.3 mass % of O; 0.5 mass % or less of N; 0.5 mass % or less of C; and a remainder being Ti and inevitable impurities; a golf club head using the alloy; and a production method for a low density titanium alloy part using the alloy. The alloy of the invention may further contain 0.01 to 2.0 mass % of V. The alloy of the invention has higher specific strength as compared to the Ti-6Al-4V alloy, is excellent in hot workability, and is reduced in cost.

1 . A low density titanium alloy, comprising:
 7.1 to 10.0 mass % of Al;   0.1 to 3.0 mass % of Fe;   0.01 to 0.3 mass % of O;   0.5 mass % or less of N;   0.5 mass % or less of C; and   a remainder being Ti and inevitable impurities.   
   
   
       2 . The low density titanium alloy according to  claim 1 , further comprising:
 0.01 to 2.0 mass % of V.   
   
   
       3 . The low density titanium alloy according to  claim 1 , further comprising;
 2.0 mass % or less of at least one element selected from the group consisting of Cr, Ni, and Mo.   
   
   
       4 . The low density titanium alloy according to  claim 2 , further comprising:
 2.0 mass % or less of at least one element selected from the group consisting of Cr, Ni, and Mo.   
   
   
       5 . The low density titanium alloy according to  claim 1 , further comprising:
 at least one of   0.01 to 0.3 mass % of B, and   0.01 to 0.3 mass % of Si.   
   
   
       6 . The low density titanium alloy according to  claim 2 , further comprising:
 at least one of 0.01 to 0.3 mass % of B, and 0.01 to 0.3 mass % of Si.   
   
   
       7 . The low density titanium alloy according to  claim 3 , further comprising:
 at least one of   0.01 to 0.3 mass % of B, and   0.01 to 0.3 mass % of Si.   
   
   
       8 . The low density titanium alloy according to  claim 4 , further comprising:
 at least one of   0.01 to 0.3 mass % of B, and   0.01 to 0.3 mass % of Si.   
   
   
       9 . The low density titanium alloy according to  claim 1 , which has a specific strength of 205 or more. 
   
   
       10 . The low density titanium alloy according to  claim 2 , which has a specific strength of 205 or more. 
   
   
       11 . The low density titanium alloy according to  claim 3 , which has a specific strength of 205 or more. 
   
   
       12 . The low density titanium alloy according to  claim 4 , which has a specific strength of 205 or more. 
   
   
       13 . The low density titanium alloy according to  claim 5 , which has a specific strength of 205 or more. 
   
   
       14 . The low density titanium alloy according to  claim 6 , which has a specific strength of 205 or more. 
   
   
       15 . The low density titanium alloy according to  claim 7 , which has a specific strength of 205 or more. 
   
   
       16 . The low density titanium alloy according to  claim 8 , which has a specific strength of 205 or more. 
   
   
       17 . The low density titanium alloy according to  claim 1 , which has a reduction of area at 1000° C. of 40% or more and a flow stress at 1000° C. of 200 MPa or less. 
   
   
       18 . The low density titanium alloy according to  claim 2 , which has a reduction of area at 1000° C. of 40% or more and a flow stress at 1000° C. of 200 MPa or less. 
   
   
       19 . The low density titanium alloy according to  claim 3 , which has a reduction of area at 1000° C. of 40% or more and a flow stress at 1000° C. of 200 MPa or less. 
   
   
       20 . The low density titanium alloy according to  claim 4 , which has a reduction of area at 1000° C. of 40% or more and a flow stress at 1000° C. of 200 MPa or less. 
   
   
       21 . The low density titanium alloy according to  claim 5 , which has a reduction of area at 1000° C. of 40% or more and a flow stress at 1000° C. of 200 MPa or less. 
   
   
       22 . The low density titanium alloy according to  claim 6 , which has a reduction of area at 1000° C. of 40% or more and a flow stress at 1000° C. of 200 MPa or less. 
   
   
       23 . The low density titanium alloy according to  claim 7 , which has a reduction of area at 1000° C. of 40% or more and a flow stress at 1000° C. of 200 MPa or less. 
   
   
       24 . The low density titanium alloy according to  claim 8 , which has a reduction of area at 1000° C. of 40% or more and a flow stress at 1000° C. of 200 MPa or less. 
   
   
       25 . The low density titanium alloy according to  claim 9 , which has a reduction of area at 1000° C. of 40% or more and a flow stress at 1000° C. of 200 MPa or less. 
   
   
       26 . The low density titanium alloy according to  claim 10 , which has a reduction of area at 1000° C. of 40% or more and a flow stress at 1000° C. of 200 MPa or less. 
   
   
       27 . The low density titanium alloy according to  claim 11 , which has a reduction of area at 1000° C. of 40% or more and a flow stress at 1000° C. of 200 MPa or less. 
   
   
       28 . The low density titanium alloy according to  claim 12 , which has a reduction of area at 1000° C. of 40% or more and a flow stress at 1000° C. of 200 MPa or less. 
   
   
       29 . The low density titanium alloy according to  claim 13 , which has a reduction of area at 1000° C. of 40% or more and a flow stress at 1000° C. of 200 MPa or less. 
   
   
       30 . The low density titanium alloy according to  claim 14 , which has a reduction of area at 1000° C. of 40% or more and a flow stress at 1000° C. of 200 MPa or less. 
   
   
       31 . The low density titanium alloy according to  claim 15 , which has a reduction of area at 1000° C. of 40% or more and a flow stress at 1000° C. of 200 MPa or less. 
   
   
       32 . The low density titanium alloy according to  claim 16 , which has a reduction of area at 1000° C. of 40% or more and a flow stress at 1000° C. of 200 MPa or less.