초록 |
Cu tubes are used in a wide range of applications, such as in high-power and high-current-engineering devices and superconductors. Cu tubes have also been used as a sheath material as conductive Mg-B/Nb/Cu and MgB2/Ti/Cu clad and Al/Cu clad as busbar with lower density than Cu materials. A typical Cu tube manufacturing process consists of three major steps: casting, extrusion, and cold tube production. The cold tube production can be a drawing, caliber-rolling, or cold-extruding process depending on the type of material, i.e. wires or rods. The hydrostatic extrusion (HE) method is optimal for fabricating products with a high extrusion ratio and complex shapes because the process conditions can enable the application of uniform pressure on the product. In addition,there is low friction between the product and the container. This is the first study to investigate the effect of extrusion ratios on the microstructural evolution, textural evolution, and CSL boundary distribution during hydrostatic extrusion of Cu tubes by increasing the extrusion ratio at the ambient temperature. This study also determines the relationship between them based on electron backscatter diffraction (EBSD) data. |