Evolution of dislocation boundaries during cold deformation of microcrystalline titanium |
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Authors: | S Yu Mironov M M Myshlyaev |
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Institution: | (1) Institute for Metals Superplasticity Problems, Russian Academy of Sciences, ul. Khalturina 39, Ufa, 450001, Bashkortostan, Russia;(2) Baĭkov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Leninskiĭ pr. 49, Moscow, 117991, Russia |
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Abstract: | The evolution of the misorientation spectrum of titanium during cold deformation via uniaxial tension was analyzed. The initial stage of plastic flow (true strain e ~ 0.1) is characterized by the intense formation of low-angle boundaries (LABs). The axes of rotation of most LABs are close to 〈001〉. This fact can be treated as a consequence of predominant prismatic slip during plastic deformation of titanium. An increase in strain to e ~ 0.5 and ~ 1.0 is accompanied by both a gradual increase in the mean misorientation angle of LABs and an increase in the fraction of high-angle boundaries (HABs). Twinning occurs over the entire deformation range under study: twinning on the {112}〈\(\overline 1 \overline 1 \)3〉 system is predominant at the initial stage, and twinning on the {102}〈\(\overline 2 \overline 1 \)3〉 system is predominant at the final stage. It is found that the misorientation spectrum of HABs forming during deformation is dominated by 15°, 30°, and 90° boundaries. |
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