In the present work, for the first time, the effect of asymmetric rolling at room temperature on the microstructural evolution, texture, hardness, tensile properties, and fracture surface of AA7075 alloy was investigated. It was found that the width of grains significantly decreased to 2.6 μm by 60 % asymmetric rolling. Also, shear bands in the RD-ND (rolling direction – normal direction) plane of AA7075 after 40 % and 60 % asymmetric rolling were evident. In addition, the size of iron-rich intermetallic particles was reduced with increasing thickness reduction. Microstructure and texture revealed that new grains through continuous dynamic recrystallization (CDRX) are created after 40 % and 60 % strain. On the one hand, after applying only 10 % thickness reduction, average hardness demonstrated 75 % enhancement. On the other hand, maximum yield (611 MPa) and ultimate tensile (644 MPa) strengths achieved in the 60 % deformed sample, demonstrating 287 % and 73 % improvement compared to the initial sample. These results were due to strain hardening, dynamic/static precipitation, and Fe-rich particle fragmentation. The Portevin-Le Chatelier (PLC) effect is reduced with increasing the strain. Interestingly, the 40 % deformed sample revealed the serrated flow. For this reason, the 40 % rolled sample has a lower total elongation (4.4 %) than the 60 % deformed sample (11.1 %). The tensile strength of the 40 % deformed sample (575 MPa) was lower than the 10 % and 20 % rolled samples (581 and 594 MPa, respectively). This result was owing to the occurrence of softening mechanisms, strengthening the Goss {110}⟨001⟩ component, and weakening the Copper {112}⟨111⟩ orientation after 40 % asymmetric rolling. By increasing the thickness reduction up to 40 %, the number of dimples decreased. However, the fracture surface of the 60 % deformed sample showed a noticeable amount of small dimples.

在目前的工作中，首次研究了室温不对称轧制对 AA7075 合金的显微组织演变、织构、硬度、拉伸性能和断裂表面的影响。发现通过 60% 的非对称轧制，晶粒的宽度显着减小至 2.6 μm。此外，AA7075 的 RD-ND（轧制方向 - 法线方向）平面在 40% 和 60% 非对称轧制后的剪切带很明显。此外，富铁金属间化合物颗粒的尺寸随着厚度减小的增加而减小。显微组织和织构显示，在 40% 和 60% 应变后通过连续动态再结晶 (CDRX) 产生新晶粒。一方面，厚度仅减少 10% 后，平均硬度增加了 75%。另一方面，在 60% 变形样品中实现的最大屈服强度 (611 MPa) 和极限抗拉强度 (644 MPa)，与初始样品相比提高了 287% 和 73%。这些结果是由于应变硬化、动态/静态沉淀和富铁颗粒破碎造成的。Portevin-Le Chatelier (PLC) 效应随着应变的增加而降低。有趣的是，40% 变形的样品显示出锯齿状流动。因此，40% 轧制样品的总伸长率 (4.4%) 低于 60% 变形样品 (11.1%)。40% 变形样品 (575 MPa) 的拉伸强度低于 10% 和 20% 轧制样品（分别为 581 和 594 MPa）。这一结果是由于软化机制的发生，加强了 Goss {110}⟨001⟩ 分量，并在 40% 非对称轧制后削弱铜的 {112}⟨111⟩ 取向。通过将厚度减少量增加到 40%，凹坑的数量减少了。然而，60% 变形样品的断裂表面显示出明显数量的小凹坑。