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

摘要

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.