Effect of natural aging on the tensile properties and the toughness of friction stir welds of 2024-T3 aluminum alloy

IF 3.8 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Advanced Joining Processes Pub Date : 2023-07-21 DOI:10.1016/j.jajp.2023.100153

Abderrahmane Djili , Boudjema Bezzazi , Nadjet Zioui , Mohamed Haboussi

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Abstract

During friction stir welding of metallic alloys, four different microstructure zones are formed in the weld, resulting in heterogeneous mechanical properties in this latter. In the case of aluminum alloys, these properties are bound to change with aging, whether natural or artificial. In this study, changes in the toughness and tensile behavior of friction stir welds in Al 2024-T3 alloy over time are investigated. Only specimens found to be defect free, by X-ray imaging, are tested. Characterized by the area under the stress-strain curve of the material, the toughness is found to be 19% lower after 24 months of natural aging. This decrease in toughness is mainly due to a loss of ductility as the elongation of the material drops by 27% while the ultimate tensile strength increases by 9%. The fracture zone and pattern remain the same for both natural aged and freshly welded specimens. These results can be used to estimate the service life of structures using such a material, as in aeronautics.

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自然时效对2024-T3铝合金搅拌摩擦焊缝拉伸性能和韧性的影响

金属合金搅拌摩擦焊接过程中，焊缝中形成4个不同的组织区，导致搅拌摩擦焊接后的力学性能不均匀。就铝合金而言，这些性能必然会随着老化而改变，无论是自然的还是人工的。在这项研究中，研究了Al 2024-T3合金搅拌摩擦焊缝的韧性和拉伸性能随时间的变化。只有通过x射线成像发现无缺陷的标本才能进行测试。从材料应力应变曲线下的面积来看，自然时效24个月后，材料的韧性降低了19%。这种韧性的下降主要是由于材料的延伸率下降了27%，而极限抗拉强度增加了9%，从而导致了延展性的丧失。自然时效和新焊试样的断口区域和断口形态基本相同。这些结果可以用来估计使用这种材料的结构的使用寿命，如在航空领域。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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