Abstract Structural features and aging behavior of Al Li, Al-Li-Cu and Al-Li-Mg alloys under different equivalent strains (e ) were investigated. Following solid-solution treatment, high-pressure torsion (HPT), asymmetric rolling (ASR) and cold rolling (CR) were adopted to introduce high, middle and low amount of strains to Al-Li-(Cu, Mg) alloys. After deformation, for the HPT processed alloys under high equivalent strains, the highest as-deformed hardness was obtained. Transmission electron microscopy (TEM) revealed that the grain size was refined to 210 nm, 120 nm and 150 nm, respectively. Under severe plastic deformation condition (e > 30), the Al Li alloy lost age-hardenability, however, the aging of the asymmetric rolled Al Li alloys increased the hardness further and the highest hardness was obtained in this alloy. For the Al-Li-Cu and Al-Li-Mg alloys, a further increase in hardness was achieved by aging the as-deformed alloys, regardless of the equivalent strains. Meanwhile, the peak hardness increases with increasing the equivalent strains. During aging treatment, the behavior of the precipitates was discussed in the present work.

中文翻译：

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不同变形方法加工的Al-Li-(cu, mg)合金时效行为

摘要 研究了Al Li、Al-Li-Cu和Al-Li-Mg合金在不同等效应变(e)下的结构特征和时效行为。固溶处理后，采用高压扭转（HPT）、非对称轧制（ASR）和冷轧（CR）对Al-Li-(Cu, Mg)合金引入高、中、低应变。变形后，HPT 加工合金在高等效应变下，获得最高的变形硬度。透射电子显微镜 (TEM) 显示晶粒尺寸分别细化至 210 nm、120 nm 和 150 nm。在严重的塑性变形条件下（e > 30），铝锂合金失去了时效硬化性，然而，非对称轧制铝锂合金的时效进一步增加了硬度，该合金获得了最高的硬度。对于 Al-Li-Cu 和 Al-Li-Mg 合金，无论等效应变如何，通过时效变形合金都可以进一步提高硬度。同时，峰值硬度随着等效应变的增加而增加。在时效处理过程中，析出物的行为在目前的工作中进行了讨论。