Abstract: In order to improve the wear resistance of titanium alloy Ti6Al4 V and high temper-ature oxidation resistance of intermetallic compound TiAl, the Double Glow PlasmaSurface Alloying Technique (DG technique) was applied to modify the surface proper-ties ofthese materials. Mo, Nb, Cr, Ni were diffused into the substrate materials toform alloyed layers with different properties. This paper shows the microstructures,microhardnesses, distributions of the alloy elements of the alloyed layers. Wear andhigh temperature oxidation tests were carried out. The test results indicate that thewear resistance of Ti6Al4 V and the high temperature oxidation resistance of TiAl wereimproved significantly.

Key words: DG technique, Ti6Al4 V, TiAl