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Densification and microstructure of TiCx/Ti nanocomposites prepared by selective laser melting

: Li, C.; Gu, D.-D.; Shen, Y.-F.; Meng, G.-B.

Zhongguo-youse-jinshu-xuehui-huikan 21 (2011), No.7, pp.1554-1561
ISSN: 1004-0609
Journal Article
Fraunhofer ILT ()

The TiCx reinforced Ti matrix nanocomposites parts were prepared by selective laser melting (SLM). The effects of applied linear laser energy density (the ratio of laser power to scan speed) on evolutions of the densification behavior, phases, and microstructures of SLM-processed parts were studied using X-ray diffractometer (XRD), field emission scanning electron microscope (FE-SEM). The formation mechanism of TiC0.625 reinforcing phase with a lamellar nanostructure during the laser-induced rapid melting/solidification process was discussed. The results show that a high densification level of 95.6% is obtained for SLM-processed parts at a laser linear energy density of 1100 J/m. The TiCx reinforcing phase disperses uniformly in the Ti matrix, having an ultrafine lamellar nanostructure with an average thickness of 54 nm. The reinforcing phase is present in the form of substoichiometric TiC0.625 with a cubic crystal structure.