The intense applied thermal gradients during the welding process leads to the variation in the properties of the weld zone and its surrounding areas. In this regard, determining the local mechanical properties and evolved microstructures of the weld and its surrounding zones are essential in the evaluation of welded structures. In this study, the local mechanical properties of Al2024 friction-stir-welded joints were precisely examined. Digital image correlation (DIC) technique using uniform stress (USM) and virtual field methods (VFM) were utilized to evaluate the local mechanical properties. The local stress-strain curves were plotted for different weld regions using local strain from the DIC technique. It was observed that the advancing side of the thermo-mechanically affected zone (TMAZ) had the lowest values of Young’s modulus and yield strength (YS), approximately 9% and 31% of the base metal, respectively. Effects of welding parameters, such as tool rotational and traverse speeds, were also taken into account. The plotted local stress-strain curve for the fractured region of welded specimens at lower rotational speed illustrated a higher strength and elongation. Furthermore, lower rotational and also higher traverse speeds resulted in the reduction of the grain size.

在焊接过程中施加的强烈的热梯度会导致焊接区及其周围区域的特性发生变化。在这方面，确定焊缝及其周围区域的局部机械性能和演变的微观结构对于评估焊接结构至关重要。在这项研究中，精确地检查了Al2024搅拌摩擦焊接接头的局部力学性能。利用均匀应力（USM）和虚拟场方法（VFM）的数字图像相关（DIC）技术用于评估局部机械性能。使用DIC技术的局部应变绘制了不同焊接区域的局部应力-应变曲线。观察到，热机械影响区（TMAZ）的前进侧的杨氏模量和屈服强度（YS）最低，分别约为母材的9％和31％。还考虑了焊接参数的影响，例如工具的旋转速度和移动速度。较低转速下焊接试样断裂区域的局部应力-应变曲线表明强度和伸长率较高。此外，较低的旋转速度以及较高的移动速度也导致晶粒尺寸减小。较低转速下焊接试样断裂区域的局部应力-应变曲线表明强度和伸长率较高。此外，较低的旋转速度以及较高的移动速度也导致晶粒尺寸减小。较低转速下焊接试样断裂区域的局部应力-应变曲线表明强度和伸长率较高。此外，较低的旋转速度以及较高的移动速度也导致晶粒尺寸减小。