Study on Annealing Process of Perforated Extruded Pure Niobium Tube Target
A large-size niobium tube target was made by perforating and extruding of niobium ingot with a diameter of 300 mm,and then annealed at different temperatures.The recovery and recrystallization tem-perature of the niobium tube during annealing were determined by differential scanning calorimetry(DSC),and the texture evolution of niobium tube after extrusion and annealing was analyzed by electron backscattered diffraction(EBSD)technique.The results show that different annealing heating rates have little effect on the initial recrystallization temperature of niobium tube.The deformed microstructure of the extruded niobium tube is mainly<100>and<111>silk texture,and<110>predominant recrystallization tex-ture is obtained after annealing.This study is helpful to improve the annealing process for the microstruc-ture homogenization of extruded niobium tubes.
pure niobium tube targetextrusionannealingrecrystallizationtexturedeformation storage energy
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