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采用热力模拟平面压缩实验和电子背散射衍射(EBSD)组织分析测试方法,研究了新型Al-Zn-Mg-Cu高强铝合金热压缩变形以及退火微观组织和织构。结果表明,在变形温度为350℃,应变速率为0.1 s~(-1)的条件下,合金微观组织演变机理为动态回复和大应变几何动态再结晶,出现旋转立方织构{001}<110>和黄铜织构{111}<110>,分别沿着α-取向线和β-取向线分布;退火后旋转立方织构减少,黄铜织构增多,旋转立方织构沿着α-取向线向黄铜织构转变。在变形温度为420℃,应变速率为0.1 s~(-1)的条件下,合金变形组织较均匀,再结晶晶粒分布在变形剧烈的晶界或三角晶界处,出现的织构种类主要有旋转立方织构{110}<110>、黄铜型{011}<211>织构;退火过程中发生亚动态再结晶,旋转立方织构强度增强,黄铜型{011}<211>织构有向高斯织构方向移动的趋势。
The hot compressive deformation and annealing microstructure and texture of the new type Al-Zn-Mg-Cu high-strength aluminum alloy were studied by using the thermal simulation plane compression test and the electron backscatter diffraction (EBSD) microstructure analysis method. The results show that the microstructure evolution mechanism of the alloy is dynamic recovery and large strain geometric dynamic recrystallization under the condition of deformation temperature of 350 ℃ and strain rate of 0.1 s ~ (-1), and the rotation cubic texture {001} <110 > And brass texture {111} <110>, respectively, along the α-orientation line and β-orientation line distribution; annealing cubic texture reduced after annealing, brass texture increased, rotating cubic texture along the α-orientation Line to brass texture change. Under deformation temperature of 420 ℃ and strain rate of 0.1 s ~ (-1), the deformation of the alloy is more uniform and the recrystallized grains are distributed in the grain boundaries or triangular grain boundaries with severe deformation. The main types of textures appear {110} <110>, brass {011} <211> textures. Sub-dynamic recrystallization occurs during the annealing, and the strength of the rotating cubic texture is enhanced. The texture of the brazed {011} <211> There is a tendency to move in the direction of Gaussian texture.