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Microstructural evolution and mechanical properties of friction-stir-welded Al-Mg-Si joint

机译：搅拌摩擦焊接Al-Mg-Si接头的组织演变和力学性能

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摘要

This study was conducted to investigate joint and mechanical properties and fatigue strength of a friction-stir-welded aluminum alloy (FSW material), using a platy extruded shape of JIS A6N01S-T5 alloy as a substrate. Furthermore, changes in mechanical properties of FSW material in a corrosive environment were examined. The substrate possessed a typical cubic crystallographic texture in a platy extruded shape of aluminum alloy. Approaching the stir zone from the substrate side, the texture greatly changed and a pair of symmetrical preferred orientations was formed. In the stir zone, the texture gradually changed along the outside of the probe of a rotating tool. FSW refined the microstructure in the stir zone through dynamic recrystallization. In the heat-affected zone (HAZ), reduction in hardness was marked because no refinement of the microstructure occurred and also heat input by FSW weakened precipitation hardening. As a result, tensile fracture of the FSW material occurred along the HAZ; however, tensile strength was maintained at 81% of the substrate. Even after immersion for a long term in salt water kept at a relatively high temperature, no harmful influence of FSW on mechanical properties was found, and rather tensile strength recovered to the level of the substrate by re-aging during immersion. Moreover, although fatigue cracks were initiated from the root of burrs formed by FSW, fatigue strength was maintained at 88% of the substrate.
机译：以JIS A6N01S-T5合金的板状挤压形状为基材，研究了搅拌摩擦焊接铝合金（FSW材料）的接头和力学性能以及疲劳强度。此外，研究了在腐蚀性环境中FSW材料的机械性能变化。基材具有典型的立方​​晶体学纹理，呈铝合金的板状挤压形状。从基材侧接近搅拌区，质地大大变化，并形成一对对称的优选取向。在搅拌区域中，纹理沿旋转工具的探针外部逐渐变化。 FSW通过动态重结晶改善了搅拌区的微观结构。在热影响区（HAZ），由于未发生微观结构的细化，并且FSW的热量输入减弱了沉淀硬化，因此硬度明显降低。结果，FSH材料沿热影响区发生了拉伸断裂。但是，拉伸强度保持在基材的81％。即使在保持在较高温度的盐水中长期浸泡后，也没有发现FSW对机械性能的有害影响，而是通过在浸泡过程中重新老化，拉伸强度恢复到了基材的水平。而且，尽管疲劳裂纹是从由FSW形成的毛刺的根部开始的，但是疲劳强度保持在基板的88％。

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