Abstract
The Stellite SF12-TiC-Mo-Sn laser melt deposited (LMD) composite coating was produced on a TA1 titanium alloy. Such composite coating was researched by means of a scanning electron microscope (SEM) and a high resolution transmission electron microscope (HRTEM). It was confirmed that Ti₃Sn nanocrystals appeared at an intersplat region, which was very compatible to the d-space of the Ti₃Sn at an orientation of (101). The Ti3Sn particles were surrounded by the amorphous phases. Under the action of such composite coating, the micro-hardness distribution of the substrate surface is in a range of 1350–1500 HV_0.2, and the wear volume loss is 1/13 of a TA1 alloy.

Key words
titanium, sliding wear, lasers, composites

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