Abstract
It is shown that, for various structural modifications of Ti-8Al-1.4Si-2.2Zr alloy, the elevation of temperature leads to the increase in the cyclic fracture toughness ΔK fc and the decrease in the fatigue threshold ΔK th. At 20°C, the cast material with coarse-grained lamellar structure exhibits better properties than the fine-grained modifications obtained by thermomechanical treatment under medium and high levels of loading. At 700°C, this is true only for medium amplitudes of the load. The procedure of quenching from the β-region of the alloy thermally deformed by 90% doubles the value of ΔK th at a temperature of 20°C as compared with the cast alloy. At the same time, the value of ΔK fc at 700°C becomes 1.6 times higher.
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