This study investigated the influence of multiple laser shock peening on microstructure, crystallographic texture, and pitting corrosion behavior of Aluminum-Lithium alloy 2060-T8 (in 3.5% NaCl) using EBSD, SEM and XPS techniques. Results show that microstructure and crystallographic texture were noticeably influenced by the peening passes. At single peening, plastic strain accommodation was homogenous, resulting in higher fraction of low Σ CSL boundaries, and significant crystallographic texture transformation from fibre (unpeened) into Cube {001}〈100〉 component (corresponding to dynamic recovery as plastic deformation mode) was induced. In contrast, repetitive peening (3 & 5 passes) induced heterogeneous plastic strain accommodation, developed random and low angle grain boundaries, and texture transformation from fibre to Goss {011}〈100〉, implying recrystallization as corresponding plastic deformation mode. As a result of dense atomic structured microstructures/textures, pitting corrosion after single peening was significantly lowered than that of multiple peening. Major reason for the improved corrosion behavior at single peening pass was the formation of dense and uniform α-Al₂O₃ type oxide film, which significantly lowered the materials dissolution. Whereas, multiple peening led to the formation of porous γ-Al₂O₃, θ-Al₂O₃ oxides and Cu-rich regions, which activated the deeper and wider pitting. Besides, the effect of precipitates (Al₂CuLi, θ′ (Al₂Cu) and β′ (Al₃Zr)) on pitting corrosion is quantitatively examined.

本研究使用 EBSD、SEM 和 XPS 技术研究了多次激光冲击强化对铝锂合金 2060-T8（在 3.5% NaCl 中）的微观结构、晶体织构和点蚀行为的影响。结果表明，微观结构和晶体织构受喷丸次数的显着影响。在单次喷丸时，塑性应变调节是均匀的，导致低 Σ CSL 边界的比例更高，并且从纤维（未喷丸）到立方体 {001}<100> 组件（对应于动态恢复作为塑性变形模式）的显着晶体织构转变为诱发。相比之下，重复喷丸（3 次和 5 次）诱导异质塑性应变调节，形成随机和小角度晶界，以及从纤维到高斯 {011}<100> 的织构转变，意味着再结晶作为相应的塑性变形模式。由于密集的原子结构微观结构/纹理，单次喷丸后的点蚀明显低于多次喷丸。单次喷丸后腐蚀行为改善的主要原因是形成了致密且均匀的 α-Al₂ O ₃型氧化膜，显着降低了材料的溶解。而多次喷丸导致形成多孔的γ-Al ₂ O ₃、θ-Al ₂ O ₃氧化物和富铜区域，从而激活更深更宽的点蚀。此外，定量研究了析出物（Al ₂ CuLi、θ'（Al ₂ Cu）和β'（Al ₃ Zr））对点蚀的影响。