Abstract
The special features of the ultrafine-grained structure forming in a Ti-6Al-4V alloy with the use of a method combining severe plastic deformation and reversible hydrogen treatment are studied by electron microscopy and X-ray diffraction analysis. Martensite and the α ↔ β phase transformations due to hydrogen presence are found to promote structure refining during severe plastic deformation of the alloy. This makes it possible to decrease the degree of deformation required for obtaining the ultrafine-grained structure with the size of elements of 0.1–0.5 μm. Formation of the ultrafine-grained structure in a Ti-6Al-4V alloy is shown to lead to growth of its strength properties by approximately a factor of 1.5, an increase in the hydrogen embrittlement resistance, and a decrease in the temperature transition to the superplastic state by 200–300 K.
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Original Russian Text © G.P. Grabovetskaya, E.N. Stepanova, I.V. Ratochka, E.V. Naidenkin, O.N. Lykova, 2012, published in Perspektivnye Materialy, 2012, No. 5, pp. 21–27.
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Grabovetskaya, G.P., Stepanova, E.N., Ratochka, I.V. et al. Structure and mechanical properties of ultrafine-grained Ti-6Al-4V alloy made by applying reversible hydrogen alloying. Inorg. Mater. Appl. Res. 4, 92–97 (2013). https://doi.org/10.1134/S2075113313020056
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DOI: https://doi.org/10.1134/S2075113313020056