Precipitation of Titanium in Titanium Carbide Particles Dispersed in Titanium Matrix Composites Synthesized from Ti–C–N System Powder Mixtures Using Arc-Melting Method

Abstract

Titanium matrix composite materials with high strength and toughness are expected to be obtained from trimodal composites (metal matrix (titanium)/ceramic (TiC)/precipitated metal (titanium) in ceramic) by titanium precipitation in brittle ceramic particles. Titanium carbide (TiC) particles dispersed in titanium matrix composites are prepared by the arc-melting method, and the effect of nitrogen content on the microstructural changes in the TiC particles is revealed. Titanium precipitation in the TiC particles is observed when more than 2 at% nitrogen is added. The mechanism of titanium precipitation is discussed in terms of the crystallographic relationship between titanium and metastable Ti₂C.

Fig. 4 Representative high resolution TEM micrograph of the interface between TiC and precipitated Ti for the 5N5TiC (a) and SAD pattern (b) with its key diagram (c).