Abstract
A new method of forming boss on a Magnesium alloy sheet has been developed by utilizing a friction stir technology. This new technology enables the press-forming of Mg alloys at room temperature without external heating devices. Rolled and extruded sheets of AZ31 Mg alloys the thicknesses of which are from 0.8 to 2mm were used as work-pieces. Forming a boss the size of which shall be from φ 3×4 to φ 7×5mm on the Mg sheet has been made by pressing a tool rotating on the sheet. We believe that this new forming technology for Mg alloys must be used in many fields of applications.
