Abstract

A novel repetitive corrugation and straightening (RCS) die geometry was evaluated in terms of its mechanical properties and microstructural modifications. An annealed 3003 aluminum alloy sheet was processed up to 6 RCS passes at room temperature, showing a significant improvement in yield strength and hardness. Changes in surface profile values were obtained along different stages of the repetitive process; this showed a clear correlation between the higher strained region and the maxima of hardness values. Moreover, differences in roughness were associated with real contact area between material and corrugating die sections. Local strain distribution generated during the process was determined by kernel average misorientation (KAM) and was consistent with microhardness mapping results. Orientation image mapping showed that grains, with the normals parallel to 〈111〉, activate dislocation arrangement and grain fragmentation process prior to other main directions. In spite of mechanical properties improvement, initial texture components were maintained.

中文翻译：

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重复波纹矫直对3003铝合金组织和力学性能的影响

摘要

一种新颖的重复波纹和矫直 (RCS) 模具几何形状在其机械性能和微观结构修改方面进行了评估。退火的 3003 铝合金板在室温下加工到 6 个 RCS 道次，显示屈服强度和硬度有显着提高。沿重复过程的不同阶段获得表面轮廓值的变化；这表明较高应变区域与硬度值的最大值之间存在明显的相关性。此外，粗糙度的差异与材料和瓦楞模具部分之间的实际接触面积有关。过程中产生的局部应变分布由内核平均取向误差 (KAM) 确定，与显微硬度映射结果一致。方向图像映射表明，谷物、法线平行于〈111〉，在其他主要方向之前激活位错排列和晶粒破碎过程。尽管机械性能有所改善，但仍保持了初始纹理成分。