Abstract
1. Spontaneous brittle fracture during isothermal aging at 250–500°C is a natural phenomenon in precipitation-hardening metastable two-phase titanium alloys. 2. The increase in strength and sharp reduction of the ductility at 250–500° are accompanied by a reduction in volume (increase of density) and the appearance of relief on the surface due to structural transformations in the β solid solution in the early stages of decomposition long before the formation of α phase. 3. The processes occurring before precipitation of α phase are associated with extremely high structural stresses capable not only of inducing microdiscontinuities but also macrocracks and even complete fracture of the piece. 4. To prevent brittle fracture during heat treatment of this alloy it must be heated from 250 to 500° at a high rate and the aging temperature should be at least 500° to ensure high strength.
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