Characteristics of Work Hardening and Anneal Softening of Titanium Base Ti-Al Alloy Wires

Abstract

Titanium base Ti-Al alloy is one of the most basic titanium alloys with the same crystal structure as pure titanium. We have researched into the microstructures and work hardening characteristics of cold-drawn pure titanium and of titanium base Ti-Al alloys containing 1 to 4%Al, and have obtained the results that, such a many twins can not be seen in the structure of the cold-drawn Ti-Al alloys like pure titanium and that the work hardening of Ti-Al alloys is much less than that of pure titanium. Next, we have observed the characteritics of softening by annealing and the recrystalization temperatures of these wires cold drawn at various degrees. For instance, in the case of 56% reduction, the beginning temperatures of recrystalization of pure Ti, Ti-1%Al alloy, Ti-2%Al alloy and Ti-4%Al alloy are at about 500°, 575°, 600° to 650° and 650° to 700°, respectively, when these wires are annealed for 1 hour.