Abstract
We study the influence of the modes of thermal treatment on the structure, phase composition, and cyclic crack resistance of preliminarily forged Ti–10.3Al–3.0Zr–1.2Si alloy at room and high (700°С) temperatures in air. It is shown that the procedure of hardening guarantees the best values of fatigue threshold ΔKth and cyclic fracture toughness ΔKfc at 20° and 700°С, which is caused by the formation of a martensitic structure, decrease in the silicon content of the titanium matrix, increase in the size of primary silicides Ti5Si3, and the appearance of secondary silicides. It is shown that the increase in the aluminum content of Ti–Al–Zr–Si alloys from 8 to 10.3 % results in a noticeable decrease in the cyclic crack resistance due to the influence of atmospheric oxygen and the precipitation of Ti3Al aluminides (of the α2-phase).
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