Abstract In this work, an extrusion die for inserting the continuous wire rope into the aluminum alloy bar is designed and manufactured, then the extrusion experiments are carried out at 500 °C. The interface microstructure evolution and mechanical properties of the composite bar are studied by different material characterization methods. As the size of micro-voids decreases, the bridging behavior is found. The interface grain boundaries gradually form and migrate, where the evolution of micro-voids from 10 μm to 1 μm is observed. Meanwhile, new grains across the welding interface are formed. Moreover, it is found that the enrichment of Zn and Si and the existence of micro-voids retard the diffusion of Fe and Al on the Fe/Al interface, and the thickness of diffusion layer ranges from 1 μm to 5 μm. Compared with the extruded bar without wire rope, there is a stress drop of 17.6 MPa on the stress-strain curve of the composite bar, but its mechanical properties are not obviously improved due to the worse Fe/Al bonding interface and the brittle Fe Al solid solution. Finally, the intergranular fracture mode is illustrated, which is mainly caused by the coarse recrystallized grains with high angle grain boundaries.

中文翻译：

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挤压纤维增强铝基复合材料棒材的界面微观结构演变及力学性能

摘要 本文设计并制造了一种用于将连续钢丝绳插入铝合金棒材的挤压模具，并在500 ℃下进行挤压实验。通过不同的材料表征方法研究了复合材料杆的界面微观结构演变和力学性能。随着微孔洞尺寸的减小，发现了桥接行为。界面晶界逐渐形成并迁移，其中观察到从 10 μm 到 1 μm 的微孔洞演变。同时，在焊接界面上形成新的晶粒。此外，发现Zn和Si的富集和微孔洞的存在阻碍了Fe和Al在Fe/Al界面上的扩散，扩散层的厚度范围为1 μm至5 μm。与没有钢丝绳的挤压棒相比，复合棒材的应力-应变曲线上有17.6 MPa的应力降，但由于Fe/Al结合界面较差，Fe Al固溶体较脆，其力学性能没有明显改善。最后，说明了晶间断裂模式，这主要是由具有大角度晶界的粗大再结晶晶粒引起的。