TiC/Ti Composite Layers Fabricated by Laser Surface Alloying



Laser surface alloying is an attractive processing to improve surface hardness, wear and corrosion resistance. In this paper, a continuous wave CO2 laser was used to irradiate commercially pure titanium surface with pre-placed active carbon powders in argon atmosphere. A compact, well-adherent, and crack-free TiC/Ti composite layer was obtained. The microstructure and phase constitution of the alloyed layers were determined and analyzed, and the micro-hardness was measured. The result of X ray diffraction (XRD) analysis shows that the alloyed layers contain TiC and Ti (martensite). The scanning electron microscopy (SEM) observation shows TiC growth morphologies have a well-developed dendrite, cellular dendrite, globular microstructure and cross-petal microstructure. The mechanism of the formation of titanium carbides is discussed. Micro-hardness of the laser surface alloyed layer was improved to 420 Hv as compared to 200 Hv of the as-received commercially pure titanium.




Wei Pan and Jianghong Gong




J. B. Zhang et al., "TiC/Ti Composite Layers Fabricated by Laser Surface Alloying", Key Engineering Materials, Vols. 336-338, pp. 1148-1150, 2007


April 2007




[1] G.L. Goswami, D. Kumar, A.K. Grover, et al.: Surface Engineering Vo15 (1996), p.65.

[2] L. Fouilland-Paille, S. Ettaqi, S. Benayoun, et al.: Surf. Coat. Technol. Vol. 88 (1996), p.204.

[3] L. Covelli, F. Pierdominici, I. Smurov and S. Tosto: Surf. Coat. Technol. Vol. 78 (1996), p.196.

[4] Y. Chen, H.M. Wang: Scripta Mater. Vol. 50 (2004), p.507.

[5] J.B. Zhang, D. Fan, S.R. Yu and J.Y. Wang: J. Mater. Sci. Vol. 38 (2003), p.3455.

[6] J.H. Lee and N.N. Thadhani: Scripta Mater. Vol. 37 (1997).