Influence of the phase composition of TiC-NiTi composite materials on the character of failure and mechanical properties

Stress-induced martensitic transformations in NiTi and NiTi–TiC composites investigated by neutron diffraction

“…In agreement with [3,18,19], no reaction was observed by optical microscopy between the NiTi matrix and the TiC particles, which were almost perfectly stoichiometric with a composition of 49.890.1 at.% C (as determined by combustion analysis with infrared detection). Given the inert nature of the TiC and the identical initial materials and processing routes for all samples, the matrix chemical composition can be assumed constant in all samples, suggesting that the differences in mechanical behavior observed in Fig.…”

Fatigue crack-growth in shape-memory NiTi and NiTi–TiC composites

“…2. The TiC particles were almost stoichiometric with a composition of 49.890.1 at.% C. No third phases have been reported in the NiTi-TiC system over a large range of compositions [13,14]. The unreacted interfaces observed with the aid of optical microscopy in the samples confirm that the TiC particles behaved as chemically inert reinforcements.…”

Combustion synthesis and mechanical properties of dense NiTi-TiC intermetallic-ceramic composites

“…[12,13] The Vickers microhardness changed at a 30 to 40 wt pct nickel content, which is indicative of the matrix phase change from TiC to nickel in dense TiC-Ni composites produced using high-pressure combustion synthesis reactions. [14] Dense TiC-30 wt pct Ni composites produced using a combustion synthesis technique were observed to have an average compressive strength of 2.9 GPa and a microhardness of 13.1 Ϯ 1.6 GPa.…”