2020 Volume 7 Issue 1 Pages 07004-1-07004-7
Magnesium is light weight, so has excellent mechanical properties, and application to various field is expected. However, commercial pure magnesium corrodes because included iron, nickel and copper. We need ultra high purity magnesium to use it at long time. In this study, preparation of ultra high purity magnesium sheet by vacuum distillation and extrusion was investigated. Vacuum distillation was performed by 600℃ of raw material temperature and 360℃ of condenser temperature using purity of 99.9 % commercial magnesium ingot. It extrude in 375℃ of temperature and 49 of extrusion ratio using the magnesium deposit obtained vacuum distillation. Magnesium sheet were more than 99.9999 % of purity. As a result of the Electron Back Scatter Diffraction Patterns (EBSD) observation of the extruded material, the orientation of the crystal grains is aligned, it was confirmed that it is a texture structure. The corrosion rate of the magnesium sheet was less than 1mm/y. According to results of tensile test in different direction, 0 °, 45 °and 90 ° to the extrusion direction, as a result of tensile test at three angles, the ultimate tensile strength was no changed, the elongation became smaller as the angle increased.
