Effect of Rolling Temperature on the Plasticity and Microstructure of Beryllium AITranslate

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Chinese Library Classification Number:TG146.24[金属学及工艺—金属材料]

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The low plasticity and cold brittleness of pure beryllium rolled at room temperature limit the ultra-thin thickness and large-size area of its sheet.Using metallographic microscope, uniaxial tension and rolling tests, the effects of deformation temperature on fracture elongation, maximum pass processing rate and microstructure of pure beryllium sheets were investigated.The results show that with the increase of deformation temperature, the plasticity increases at first and then decreases with a fluctuating trend, and two optimal plastic zones appear at 325~350 ℃ and 600~700 ℃.When the pure beryllium sheet is rolled and deformed in the second optimal plastic zone, the grains are elongated along the rolling direction and undergo a certain degree of dynamic recrystallization, so that the grains are refined and the microstructure is improved to a certain extent.And the higher the rolling temperature, the greater the degree of microstructure improvement.The recrystallization degree of pure beryllium sheets during annealing in the second optimal plastic zone gradually tends to be complete with the increase of temperature.In order to significantly improve the microstructure of pure beryllium sheets and make the recrystallization degree tend to be complete, the hot rolling temperature and annealing temperature should be selected in the range of 600~700 ℃.