6111-T6铝合金板材高速机器人搅拌摩擦加工的局部成形性改善

IF 2 Q3 ENGINEERING, MANUFACTURING

Manufacturing Letters Pub Date : 2025-05-10 DOI:10.1016/j.mfglet.2025.03.006

Shivakant Shukla , Hrishikesh Das , Katherine E. Rader , Mayur Pole , Zehao Li , Mert Efe , Piyush Upadhyay

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引用次数: 0

摘要

本研究考察了搅拌摩擦处理（FSP）对6111-T6铝合金板材局部成形性的影响，利用亚尺度拉伸和VDA弯曲试验，以及电子显微镜进行微观结构分析。结果表明，FSP显著提高了均匀伸长率和总伸长率，分别提高了100%和50%，但降低了屈服强度和极限拉伸强度。电子背散射衍射显示剪切带内有明显的变形和不同的断裂路径：由于晶界密度增加，FSP呈晶间断裂，T6呈混合断裂。FSP的晶粒细化促进了裂纹尖端的塑性变形，导致钝化和断裂韧性增强，从而改善了弯曲性能。

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Local formability improvement of 6111-T6 aluminum alloy sheet through high-speed robotic friction stir processing

This study examines the impact of friction stir processing (FSP) on the local formability of 6111-T6 aluminum alloy sheets, utilizing sub-scale tensile and VDA bend tests, along with electron microscopy for microstructural analysis. Results show that FSP notably increased uniform and total elongation by 100% and 50%, respectively, though it reduced yield and ultimate tensile strength. Electron backscatter diffraction revealed significant deformation within shear bands and varied fracture paths: intergranular for FSP due to increased grain boundary density and a mix for T6. FSP’s grain refinement facilitated plastic deformation at crack tip leading to blunting and enhanced fracture toughness thus improved bend properties.

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