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首页> 外文期刊>Journal of Materials Engineering and Performance >Microstructural Investigation of Friction-Stir-Welded 7005 Aluminum Alloy
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Microstructural Investigation of Friction-Stir-Welded 7005 Aluminum Alloy

机译：搅拌摩擦焊接7005铝合金的显微组织研究

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摘要

This paper is aimed to investigate the microstructure of 7005 aluminum sheets joined by friction-stir welding as well as their mechanical properties. Specimens with ten different sets of welding parameters were studied. Tensile test and fracture analysis determined that the joint of the best quality was obtained at the rotation speed of 1000 rpm matching with the travel speed of 200 mm/min, and the travel speed has more impact on the ultimate tensile strength. Optical microscope observation was applied to this high-quality specimen and gave evidence to explaining the formation of the onion ring structure. Electron back-scattered diffraction (EBSD) technique was employed to characterize the textures and revealed the evolution of microstructures during friction stir processing. The EBSD results showed that the grains maintain their original orientations at relatively low deformation while the orientations rotate under increasing strain. Accumulated rotation will turn the textures into mixed shear components, which finally results in grain refinement and contributes to the high quality of the joint.
机译：本文旨在研究通过搅拌摩擦焊连接的7005铝板的显微组织及其力学性能。研究了具有十组不同焊接参数的标本。拉伸试验和断裂分析表明，在1000 rpm的转速与200 mm / min的行进速度相匹配的情况下，可获得质量最好的接头，并且行进速度对极限抗拉强度的影响更大。将光学显微镜观察应用于该高质量样品，并为解释洋葱环结构的形成提供证据。电子背散射衍射（EBSD）技术被用来表征织构，并揭示了摩擦搅拌过程中微观结构的演变。 EBSD结果表明，晶粒在相对较低的变形下保持其原始取向，而取向在增加的应变下旋转。累积的旋转会将纹理转变成混合的剪切分量，最终导致晶粒细化并有助于接头的高质量。

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