Effect of β stabilizers on the mechanical properties of titanium alloys with an α structure

Conclusions

• 1. The addition of β stabilizers to α titanium alloys with an original fine-grained structure increases the strength and the overall ductility, since the structure is refined and β phase is precipitated, with a bcc lattice, which has a larger number of possible slip planes than the α phase, with a fcc lattice.

• 2. Increasing the amount of β stabilizer in alloys with a coarse-grained lamellar structure, which is formed during slow cooling from the β region, reduces the overall ductility in direct proportion to the concentration of β stabilizer. This is due to the increase in the degree of irregularity of plastic deformation in the alloy with a coarse-grained structure with increasing amounts of β stabilizer in the alloy.

• 3. At concentrations of β stabilizer near the critical, an increase of the aluminum content to 6–8% sharply reduces the ductility regardless of the structural characteristics.

This is evidently due to the supersaturation of α phase with aluminum and the occurrence ofα ₂ phase in separate sections.