Abstract
The effect of yttrium and germanium microalloying on the structure and properties of the near-β-titanium alloy VT35 sheets in the state after the vacuum annealing, quenching, and subsequent continuous heating has been studied using optical and transmission electron microscopy, X-ray and thermal analysis, and miсrohardness. It has been found that yttrium microalloying leads to the formation of Y2O3 oxide particles in the alloy. It is shown that the yttrium oxide particles play a dual role in the alloy. Firstly, these particles being at the grain boundaries impede its movement during heating to a single-phase β-region, i.e., they inhibit a grain growth. Secondly, they affect the stability of the β-solid solution to the processes of decomposition during the subsequent heating by linking the oxygen in the alloy. It is found that the germanium microalloying unlike yttrium microalloying does not lead to the chemical compound formation. During heat treatment germanium being in a solid solution affects the grain structure and phase composition of the alloy less than yttrium.
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