Microstructure Characteristics Of Ti Research Articles

Microstructure characteristics of Ti 3Al/TiC ceramic layer deposited by laser cladding

Al + TiC laser cladding coatings were prepared on Ti–6Al–4V alloy by CO 2 laser cladding technique. The microstructure, micro-hardness and phase constitutes of the laser cladding layer were investigated by means of scanning electron microscope (SEM), X-ray diffraction (XRD) and microsclermeter. The results indicated that the laser cladding layer solidified into the fine microstructure rapidly, and TiC hard phase was dispersived in the cladding layer. When the mass percent of TiC was 40%, the micro-hardness (1100HV 0.2–1250HV 0.2) of Al + TiC cladding layer was 3 times more than that of the Ti–6Al–4V alloy substrate (350–370HV 0.2). The cladding layer mainly consisted of α-Ti (Al), β-Al (Ti), Ti 3Al, TiAl, Al 3Ti and TiC phase. There phases were beneficial to improve the hardness and wear resistance of the cladding layer.

MODIFICATION OF MICROSTRUCTURE AND PROPERTIES OF ION PLATED TITANIUM NITRIDE FILM BY ADDING YTTRIUM

The microstructure and properties of ion plated titanium nitride film can be improved by adding rare earth element yttrium. Y-modified titanium nitride (Ti(Y)N) film exhibits an excellent corrosion resistance and binding strength to the substrate of A3 steel. The microstructure characteristics of Ti(Y)N/A3 system have been investigated by X-ray diffraction, ion probe mass analysis and cross section transmission electron microscopy. The results show that yttrium is enriched at the interface of Ti(Y)N/A3 system and the modification of Y at the interface leads to a very good metallurgical transition band from the substrate to the film and the preferential orientation along close-packed TiN(lll) crystal plane, which may be the major reasons for the improvement of the properties of the Ti(Y)N film.