β-Titanium alloys
β-Titanium alloys include Ti-5Al-5Mo-5V-3Cr-0.5Fe Titanium alloy, Ti-5Ta-1.8Nb Titanium alloy, Ti-3Al-8V-6Cr-4Mo-4Zr Titanium alloy, Ti-4.5Sn-6Zr-11.5Mo Titanium alloy, Ti-8Mo-8V-2Fe-3Al Titanium alloy, Ti-30Nb-1Mo-4Sn Titanium alloy, Ti-15Mo Titanium alloy, TiNbTaZr Titanium alloy and Ti-13V-11Cr-3Al Titanium alloy etc.
TRUER Ti-5Al-5V-5Mo-3Cr Powder:
TRUER TiNb Powder:
Morphology of Truer β-Titanium alloy Powder:
β-Titanium alloys has excellent biocompatibility and mechanical properties, so it plays an irreplaceable role in the fields of aerospace and medical devices.
But how can we make β-Titanium alloys to maintain high strength while also maintaining good deformation behavior and good plasticity?
Deformation heat treatment technology is the key technology to solve this problem.
Deformation heat treatment is far more than a simple combination of plastic deformation and heat treatment. It’s a precisely controlled process designed to make the two strengthening mechanisms “react” with each other, producing a synergistic effect. The core logic unfolds in three key stages:
a. Solution treatment in the β-phase region:
The β titanium alloy is first heat-treated at a specific high temperature. By controlling the cooling rate, researchers can tailor the volume fraction, size, and distribution of the primary α phase.
b. Plastic deformation:
Processes like cold rolling are applied to break up the primary α phase and refine the β grains, while introducing a high density of dislocations and subgrain boundaries.
c. Final aging treatment:
The dislocations and other lattice defects created earlier serve as preferential sites for secondary α-phase nucleation. This leads to a fine, dispersed α phase, significantly boosting alloy strength.
However, a finer α phase increases hardness but often reduces ductility. Thus, fine-tuning the heat treatment parameters to balance the size, volume fraction, and distribution of precipitates becomes the key to achieving an optimal strength–ductility ratio.
After deformation, the grains are refined and dislocations increase, providing sufficient nucleation points for the α phase, and both the yield strength and fracture strength increase sharply.
During aging processes, grain boundaries, phase boundaries, and dislocations within materials act as “energy highlands,” providing two critical conditions for precipitation phase formation.
