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利用光学显微镜(OM)和扫描电镜悬挂的EBSD背散射衍射实验观察并研究了ZK60镁合金铸轧条带在热压(350℃/0.1 s-1)及退火处理(退火温度分别为250,300,350和400℃,退火时间分别为100,1000,5000,10000和50000 s)条件下的微观结构组织与织构演变。利用动态再结晶理论分析了ZK60镁合金铸轧条带、条带经小应变变形和大应变变形条件下的微观结构演变机理,利用静态再结晶理论分析了试样在不同热处理条件下的组织变化。结果表明,铸扎条带在热压变形后基面织构由弱变强,滑移和孪生导致动态再结晶发生,随应变增加,出现剪切带,晶粒明显细化。退火后基面织构逐渐弱化,基面沿轧制方向发生倾转,材料发生了明显静态再结晶。
The effects of hot pressing (350 ℃ / 0.1 s-1) and annealing treatment (annealing temperature 250, 300, 350 and 400 respectively) were observed and studied by using EBSD backscattering diffraction (OM) and scanning electron microscopy ℃, annealing time were 100,1000,5000,10000 and 50,000 s) under the conditions of microstructure and texture evolution. The dynamic recrystallization theory was used to analyze the microstructure evolution mechanism of ZK60 magnesium alloy strip under the condition of small strain deformation and large strain deformation. The static recrystallization theory was used to analyze the microstructure evolution of the sample under different heat treatment conditions . The results show that the texture of the cast strip changes from weak to strong after hot pressing deformation, and the dynamic recrystallization occurs due to slip and twinning. With the increase of strain, the shear band appears and the grains are obviously refined. After annealing, the texture of the base surface gradually weakened, the base surface tilted along the rolling direction, and the material was obviously static recrystallized.