high strength alpha - beta alloy comprising essentially al : 4 . 5 - 5 . 5 %, v : 3 . 0 - 5 . 0 %, mo : 0 . 3 - 1 . 8 %, fe : 0 . 2 - 1 . 2 %, oxygen 0 . 12 - 0 . 25 % ti : balance . all other incidental elements should be less than 0 . 1 % for each element and less than 0 . 5 % in total . the alloy possesses improved machinability and ballistic performance compared to ti - 6al - 4v .