Abstract: In this paper diffusion wear in milling of titanium alloys has been investigated. At high speed milling, the tool wear is mainly caused by diffusion. The wear pattern is characterized by the combine action of the extension of the face crater edge and glacier wear on the flank. The evidence of the diffusion of cobalt and carbon in boundary layer between the milling cutter and the workpiece has been obtained. Furthermore it was first revealed that the carbon rich layer was formed in the boundary layer and carbon poor layer was found in the sub-layer under the tool flank as the diffusion wear took place. Because of the reason mentioned above, wear on the brittleness and weakening in the surface layer can be fully explained.

Key words: 刀具磨损, 扩散磨损, 钛合金, 铣削加工