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The microstructural features and high-temperature oxidation resistance ofhybrid (TiC+TiB) networks reinforced Ti-6Al-4V composites were investigatedafter fabricated with reaction hot pressing technique. The inhomogeneousdistribution of hybrid reinforcers resulted in a sort of stress-induced grainrefinement for {\alpha}-Ti matrix phase, which was further facilitated byheterogeneous nucleation upon additive interfaces. HRTEM analyses revealed thecrystallographic orientation relation between TiB and alpha-Ti phases as(201)TiB//(-1100)alpha-Ti plus [11-2]//[0001] alpha-Ti, while TiC and{\alpha}-Ti phases maintained the interrelation of (-200)TiC//(-2110){\alpha}-Ti and [001]TiC//[01-10] alpha-Ti. The hybridly reinforcedTi-6Al-4V/(TiC+TiB) composites displayed superior oxidation resistance to boththe sintered matrix alloy and the two composites reinforced solely with TiC orTiB addition during the cyclic oxidation at 873, 973 and 1073 K respectivelyfor 100 h. The hybrid reinforcers volume fraction was a more influential factorto improve oxidation resistance than the matrix alloy powder size. Astemperature rose from 873 to 1073 K, the oxidation kinetics transferred fromthe nearly parabolic type through qusilinear tendency into the finally linearmode. This corresponded to the morphological transition of oxide scales from acontinuous protective film to a partially damaged layer and ended up with thecomplete spallation of alternating alumina and rutile multilayers. Aphenomenological model was proposed to elucidate the growth process of oxidesscales. The release of thermal stress, the suppression of oxygen diffusion andthe fastening of oxide adherence were found as the three major mechanisms toenhance the oxidation resistance of hybrid reinforced composites.

journal of alloys and compounds

High-temperature cyclic oxidation kinetics and microstructural  transition mechanisms of Ti-6Al-4V composites reinforced with hybrid  (TiC+TiB) networks