Abstract
We study two alloys of the Ti–6.6Al system with zirconium contents of 2.4 and 4.2% and silicon contents of 1.3 and 1.05% at temperatures of 20–700°С. The alloys were smelted by using an electron- beam installation under the conditions of electromagnetic mixing of the melt in a crucible. Then the alloys were deformed (in the α + β-domain) by rotary forging within a single run and rolling with the help of flat rolls with origin in the β -domain and procedures of intermediate heating. It is shown that, in alloys of the Ti–Al–Zr–Si system, the solid-solution hardening is supplemented by dispersion hardening with silicides. Zirconium hardens the solid solution and exerts the influence on the type and morphology of the hardening phase as a result of which it becomes possible to get a plasticity of the cast alloy of up to 2% at room temperature. The Ti–6.6Al–4.2Zr–1.05Si alloy after rolling has better structure and mechanical properties under static tension at 700°C.
Published Version
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