Microstructures and Mechanical Properties of Commercial Hot-Extruded Copper Processed by Torsion Deformation

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• 作者：Ning Guo ; Xiaoxia Li ; Mei Xiao ; Renlong Xin ; Linjiang Chai ; Bo Song ; Hongbing Yu and Lu Li
• 刊名：Advanced Engineering Materials
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：18
• 期：10
• 页码：1738-1746
• 全文大小：4582K
• ISSN：1527-2648

文摘

Free-end torsion deformation is used for processing copper rod in this work. Both microstructures and mechanical properties of the torsional rods are quantitatively analyzed. The results show that gradient lamellar dislocation substructures (LDS) along the radial direction as the main defects are formed after torsion. The increment of the LDS density, the shrinking of spacing size, and the change of length/spacing (L/S) ratio of the LDS are all non-monotonic function of torsion revolution. High-density LDS with fine spacing can retain strain hardening capability, which results in good combination of high tensile strength and good ductility in the torsional deformed sample with large number of revolutions. The influence of torsion strain on primary twin boundaries (TBs) in the hot-extruded rod is also discussed.