Recrystallization behavior of rolled TiZrNbSn alloy
Firstly,the cold-rolled Ti-49Zr-21Nb-1.0Sn(TZNS1.0)alloy was subjected to recrystallization annealing at 600,650,700,750,800 and 850 ℃ for 10,20,30,60,90 and 120 min,respectively.Subsequently,the microstructure evolution of the alloy after heat treatment was analyzed using optical microscope(OM)and electron backscatter diffraction(EBSD)technique.The recrystallization activation energy of the alloy was calculated,and its recrystallization kinetics model was established.The results show that with the increase of annealing temperature,the recrystallization nucleation incubation time of the TZNS1.0 alloy is shortened,and the β grain undergoes recovery,recrystallization nucleation,and growth stages.As the annealing time increases,the grain size of the alloy increases,but the growth rate gradually decreases.After recrystallization annealing at 750 ℃,only a few areas of the TZNS1.0 alloy undergo recrystallization,while the majority of the areas are still deformed microstructure with many small-angle grain boundaries,high-density dislocations and rolling textures.After annealing at 800 ℃,the recrystallization area exhibits large-angle grain boundaries,and the rolling texture and high-density dislocations are eliminated.When the annealing temperature further increases to 850 ℃,the recrystallization process is complete and the alloy grains grow significantly.The recrystallization activation energy of the TZNS1.0 alloy is 67.45 kJ/mol.When annealed at 850 ℃,the recrystallization kinetics equation of the alloy is x=1-e-0 05t0.9.
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