Preparation of Ultra High Purity Magnesium Sheet by Vacuum Distillation, Extrusion and Forging

Magnesium is light weight and has excellent bioabsorbability. Therefore, it is expected to be used as a biomaterial in the medical field. However, commercially available pure magnesium contains impurities such as iron, which promotes corrosion in the body. Ultra high purity magnesium is required to keep magnesium in the body for a long time. In addition, it is difficult to put it into practical use in a wide range because the strength is insufficient only with ultra high purity magnesium. Therefore, it was thought that forging would improve the strength and mechanical properties. Therefore, in this study, we investigated the production of ultra high purity magnesium sheet material by vacuum distillation, extrusion and forging. The purity of the prepared magnesium sheet was 99.999% or more, the tensile strength of the forged material was larger than that of the extruded material, and the elongation was smaller than that of the extruded material. It was also confirmed by EBSD (Electron Back Scatter Diffraction Patterns) observation that the extruded material had a texture and that the crystal grains of the forged material were refined.