Alloy of martensitic class of system Ti-Al-Mo-V-Cr-Fe microalloyed by yttrium (alloy 1) and zirconium (alloy 2) after quenching of two-phase a + b- region for b-solid solution and subsequent aging was investigated. It is shown that in the alloys 1 and 2 in the aging temperature range 450-550°C decomposition of the metastable b-solid solution is dispersed to form a secondary a-particles. The increase of aging time delay contributes to more complete of decomposition, the lattice reduction period b-phase and predominantly by hardening of alloys. It is found that the alloy 1 with yttrium achievable level of performance in aging hardness higher than in alloy 2 with zirconium, resulting in a greater volume fraction in the alloy 1 of the metastable b-solid solution, which undergoes decomposition.