Annealing Temperature Influence Titanium Zirconium Molybdenum Alloy Properties

Titanium zirconium molybdenum (TZM) alloy after deformation strengthening typically generate residue stress. In order to eliminate residue stress, while changing the properties of the alloy, are generally required to anneal.

After studies found that TZM alloy process vacuum annealing after extrusion after, in which the annealing temperature increased from 950℃ to 1050℃, the strength and the elongation of TZM alloy changed little, but when the annealing temperature increased from 1050℃ to 1600℃, TZM alloy significantly improved elongation, and tensile strength decreased.

In addition, as the annealing temperature increase, the hardness of the TZM alloy is lowered, especially when in 1400~1500 ℃. So we can see, with the annealing temperature increase the hardness of the alloy is lowered very obvious. Therefore, it is considered that grains group up with annealing temperature increases, but can quickly eliminate dislocation, lattice distortion and other defects, so that the ductility of the alloy increases, stretching decreased.

Annealing temperature also make titanium zirconium molybdenum alloy dislocation density changes, TZM alloy annealed at 1450 ℃ for 15 minutes, the dislocation density decreased from the original 3 × 1010cm-2 to 7 × 109cm-2, and the higher the annealing temperature, the shorter the time to reduce the dislocation density.