Abstract: The high-speed milling of titanium material has been widely used in aerospace industry for its high-efficiency and high-quality advantages. In order to provide experimental basis for optimizing the parameters of high-speed milling titanium materials and study on surface integrity, the surface morphology and microstructure of the high-speed milling of titanium with different parameters are analyzed by scanning electron microscope (SEM). The results are as follows: the milling surface quality becomes better with increasing spindle speed; axial cutting depth has little effect on the surface microstructure of samples; the quality of the surface machined by a milling cutter along a straight path for one cutting gets worse from the centre to the edge; at the experiment condition, the deformed microstructure does not appear at almost all milling surface, but only at some very small part of the milling surface and the place cut by the tip of the cutter.

Key words: titanium alloy, high-speed milling, surface morphology, surface microstructure, surface integrity