Hydrogen Effect on the Evolution of the Structural-Phase State and Superplastic Properties of Ultrafine-Grained Ti-Al-V-Mo Alloy

G. P. Grabovetskaya; I. P. Mishin; E. N. StepanovaO. V. Zabudchenko

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Hydrogen Effect on the Evolution of the Structural-Phase State and Superplastic Properties of Ultrafine-Grained Ti-Al-V-Mo Alloy

机译：Hydrogen Effect on the Evolution of the Structural-Phase State and Superplastic Properties of Ultrafine-Grained Ti-Al-V-Mo Alloy

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Abstract The formation of ultrafine-grained structures is a well-known method of decreasing the temperature and/or increasing the strain rate to provide superplasticity in titanium alloys. Under certain conditions, dissolved hydrogen can produce a plasticizing effect on titanium alloys, showing up as a decrease in their stress and/or an increase in their ultimate strain. Here we study the effect of 0.3 wt % of dissolved hydrogen on the structure, phase state, and superplastic properties of an ultrafine-grained (α + β) Ti-Al-V-Mo system (VT16 alloy) at a temperature of 823–923 K. The ultrafine-grained structure of Ti-Al-V-Mo (VT16 alloy) and Ti-Al-V-Mo-0.3 wt % H (VT16-H alloy) results from severe plastic deformation via uniaxial compression with a change in the strain axis and in the temperature from 1023 to 823 K. In the temperature range used, the presence of hydrogen in the solid solution of VT16 alloy decreases its superplastic properties. During deformation, hydrogen is redistributed in the bulk of the material by elastic stress fields and is accumulated in the most stressed regions, leading to plastic strain localization and to a decrease in the strain to fracture. The release of hydrogen from VT16-H alloy during deformation activates its β → α transformation and associated diffusion redistribution of its alloying elements, contributing to the accommodation of grain boundary sliding and to the increase in the strain to fracture.

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《Physical mesomechanics》 |2022年第5期|413-423|共11页
作者
G. P. Grabovetskaya; I. P. Mishin; E. N. StepanovaO. V. Zabudchenko;
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Institute of Strength Physics and Materials Science, Siberian Branch, Russian Academy of Sciences;

National Research Tomsk Polytechnic University;

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正文语种英语
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titanium alloy; hydrogen; ultrafine-grained structure; deformation; plastic strain localization; phase transformation;

Hydrogen Effect on the Evolution of the Structural-Phase State and Superplastic Properties of Ultrafine-Grained Ti-Al-V-Mo Alloy

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