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Mechanical properties of severely plastic deformed aluminum sheets joined by friction stir welding

机译：搅拌摩擦焊接产生的严重塑性变形铝板的力学性能

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The severely plastic deformed aluminum sheets were joined by friction stir welding (FSW). The technique used for imposing the severe strain to the sheets was constrained groove pressing (CGP) process. The specimens with three different imposed strains by CGP, which lead to different initial microstructures, were joined at various rotation (ω) and traveling (V) speeds. The microhardness measurements and microstructure investigations were carried out. It was revealed that after FSW process of the specimens strained by CGP process, grain growth and correspondingly hardness reduction were observed at the stir zone. Also, transverse tensile test was performed at all conditions. For the CGPed samples, it has been observed that with increasing the rotation speed, the strength of weld was decreased while the effect of traveling speed on the strength was different at various strains. Furthermore, the results achieved from FSW of severely deformed samples were compared with the results achieved from FSW of annealed ones.
机译：严重塑性变形的铝板通过搅拌摩擦焊（FSW）连接在一起。用于施加严重应变的技术是约束凹槽压制（CGP）工艺。通过CGP施加了三种不同应变的样本导致了不同的初始微观结构，并以不同的旋转（ω）和行进（V）速度进行了接合。进行了显微硬度测量和显微组织研究。结果表明，采用CGP工艺对试样进行FSW加工后，在搅拌区观察到晶粒长大和相应的硬度降低。另外，在所有条件下都进行了横向拉伸试验。对于CGPed样品，已经观察到，随着转速的增加，焊接强度降低，而在各种应变下行进速度对强度的影响也不同。此外，将严重变形样品的FSW结果与退火样品的FSW结果进行了比较。

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