The effect of hot deformation on microstructure and quenching-induced precipitation behavior of an Al-Zn-Mg-Cu alloy 7055 was investigated by electron backscattered diffraction (EBSD), transmission electron microscope (TEM), high resolution transmission electron microscope (HRTEM) and scanning transmission electron microscope (STEM). In the solution heat treated and slowly-quenched alloy without hot deformation, there are equiaxed grains with low dislocation density, and there is major quenching-induced η (MgZn₂) phase located at grain boundaries and on some Al₃Zr dispersoids in the interior of grains and minor T(Al₂Zn₃Mg₃) phase on Al₃Zr dispersoids inside grains. While in the solution heat treated and slowly-quenched alloy after hot rolling, there are recrystallized grains and subgrains with higher dislocation density, and there is a larger amount of quenching-induced η and T phase on incoherent Al₃Zr dispersoids inside recrystallized grains and at (sub) grain boundaries; moreover, quenching-induced S (Al₂CuMg) phase and Zn-Cu rich Y phase are observed in the interior of subgrains. The precipitation behavior of these quenching-induced phases has been discussed primarily based on their chemical compositions, nucleation sites and different microstructure features in the solution heat treated alloy with and without hot deformation.

通过电子背散射衍射（EBSD），透射电子显微镜（TEM），高分辨率透射电子显微镜（HRTEM）和热电子显微镜研究了热变形对Al-Zn-Mg-Cu合金7055的组织和淬火诱导析出行为的影响。扫描透射电子显微镜（STEM）。在没有热变形的固溶热处理和缓慢淬火的合金中，存在等轴晶晶粒，其位错密度低，并且在内部晶界和一些Al ₃ Zr弥散体上存在主要的淬火诱导η（MgZn ₂）相。晶和次要T（Al ₂ Zn ₃ Mg ₃）相对Al _3的影响Zr分散颗粒在晶粒内。在热轧后的固溶热处理且缓慢淬火的合金中，有重结晶的晶粒和亚晶粒具有较高的位错密度，并且在重结晶的晶粒和晶粒内部的不相干的Al ₃ Zr弥散质上存在大量的淬火诱发的η相和T相。在（子）晶界处；此外，在亚晶粒内部观察到淬火诱导的S（Al ₂ CuMg）相和富Zn-Cu的Y相。这些淬火诱导相的析出行为主要是根据其化学成分，成核位点和固溶热处理合金（有无热变形）的不同微观结构特征进行讨论的。