Effect of Annealing and Cold Work on Mechanical Properties of Beta III Titanium Alloy

Experiments have been carried out to study the effect of annealing and cold work on mechanical properties of beta III titanium alloy. Material was annealed at different temperatures above the beta transformation temperature, and then cold drawn to about 53% reduction. Tensile test was performed on samples after each drawing step to study the evolution of mechanical properties. Recoverable strain was measured after unloading from 4% tensile strain. Results show that the effect of annealing and cold work is closely related to the stress induced martensite phase transformation (SIM).  Lower annealing temperature results in higher strength and recoverable strain, which is further increased by cold work. A total recoverable strain of ~3.2% was obtained from the annealed and cold worked sample.