Continuous texture evolution of the Al‐Cu‐Mg alloy during the staged solid solution and corresponding influence on fatigue property has been studied by means of X‐ray diffraction, electron back scattered diffraction and scanning electron microscopy. The characteristic texture transition rate X_CGB and orientation streamline approach was introduced to further investigate the behind mechanisms. The results show that the two‐step solid solution could significantly enhance the X_CGB, thereby contributes to reduce the fatigue crack growth rate of Al‐Cu‐Mg T3 sheet during stage Π. The near Cube texture with high Schmid factor (SF) and low Taylor factor (TF) tends to induce significant crack deflection, crack closure and strengthened planar slip. The potential 60°<1, −1, 1> twin relation and mutual transformation existed between Goss and P texture would further reduce the fine random orientation grain and inter‐granular fatigue crack extension. Such above effects would be responsible for the excellent correspondence between X_CGB and fatigue resistance.

中文翻译：

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Al-Cu-Mg分阶段固溶过程中连续织构演变及其对疲劳强度的影响

通过X射线衍射，电子背散射衍射和扫描电子显微镜研究了分阶段固溶过程中Al-Cu-Mg合金的连续织构演变及其对疲劳性能的影响。引入特征纹理转变速率X _CGB和方向流线化方法来进一步研究其背后的机制。结果表明，两步固溶可以显着提高X _CGB，从而有助于降低Π阶段Al-Cu-Mg T3板的疲劳裂纹扩展率。具有高施密特因子（SF）和低泰勒因子（TF）的近立方织构趋于引起明显的裂纹挠度，裂纹闭合和增强的平面滑移。高斯和P质构之间存在60°<1，-1，1>的潜在孪生关系和相互转化将进一步减少细小的随机取向晶粒和晶间疲劳裂纹扩展。上述效果将导致X _CGB与抗疲劳性之间的出色对应。