Titanium alloy composition having a major phase of alpha"

Abstract

Quenching a work piece made of a titanium alloy having a temperature higher than 800° C. to a temperature lower than 500° C. at a cooling rate greater than 10° C./second between 800° C. and 500° C. is used to render the cooled work piece containing α” phase as a major phase. The titanium alloy composition contains at least one isomorphous beta stabilizing element selected from Mo, Nb, Ta and W; and the balance Ti, wherein said composition has a Mo equivalent value from about 6 to about 9. The work piece is preferably a medical device.

1 . A titanium alloy composition comprising at least one isomorphous beta stabilizing element selected from the group consisting of Mo, Nb, Ta and W; and the balance Ti, wherein said composition has a Mo equivalent value from about 6 to about 9, and has an α” phase as a major phase.  
     
     
         2 . The titanium alloy composition according to  claim 1 , which is substantially free from an eutectoid beta stabilizing element selected from the group consisting of Fe, Mn, Cr, Co, and Ni.  
     
     
         3 . The titanium alloy composition according to  claim 1 , which is substantially free from Al.  
     
     
         4 . The titanium alloy composition according to  claim 1 , which is substantially free from V.  
     
     
         5 . The titanium alloy composition according to  claim 1 , which consists essentially of at least one isomorphous beta stabilizing element selected from the group consisting of Mo, Nb, Ta and W; and the balance Ti.  
     
     
         6 . The titanium alloy composition according to  claim 5 , which comprises one or more incidental impurities selected from the group consisting of carbon, oxygen and nitrogen, wherein a total amount of said one or more incidental impurities is less than 1 wt %  
     
     
         7 . The titanium alloy composition according to  claim 1 , which is a medical device.