Initial microstructure influence on Ti–Al–Mo–V alloy's superplastic deformation behavior and deformation mechanisms

Superplastic forming is an effective way to manufacture complex-shaped parts of titanium-based alloys. This paper studies the influence of the initial microstructure and its strain-induced evolution on superplastic deformation behavior and the formability of a titanium-based alloy. Two types of Ti–A...

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Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2021-01, Vol.802, p.140626-10/140626, Article 140626
Main Authors: Mosleh, A.O., Kotov, A.D., Vidal, V., Mochugovskiy, A.G., Velay, V., Mikhaylovskaya, A.V.
Format: Article
Language:English
Subjects:
Alloys
Banded structure
Deformation effects
Deformation mechanisms
Dynamic recrystallization
Edge dislocations
Engineering Sciences
Evolution
Grain growth
Grain structure
Hardening rate
Heat treating
Microstructural evolution
Microstructure
Molybdenum
Slip bands
Strain hardening
Strain rate sensitivity
Superplastic deformation
Superplastic forming
Superplasticity
Titanium alloys
Titanium base alloys
Vanadium
Yield strength
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Summary:Superplastic forming is an effective way to manufacture complex-shaped parts of titanium-based alloys. This paper studies the influence of the initial microstructure and its strain-induced evolution on superplastic deformation behavior and the formability of a titanium-based alloy. Two types of Ti–Al–V–Mo alloy samples having a different fraction of recrystallized grains before the start of the superplastic deformation were studied. The deformation behavior, including strain hardening and strain rate sensitivity of the flow stress, was analyzed in a temperature range of 775 °C–900 °C and a strain rate range of 10−5 to 10−2 s−1. Strain-induced changes of the microstructure within the bulk of the samples and on the surface of the pre-polished samples were studied during superplastic deformation with a constant strain rate. The dynamic recrystallization and dynamic grain growth in the volume of the samples and the multiple slip bands on the samples' surface were revealed after superplastic deformation. The grain structure evolution and slip bands localization depended on the samples’ initial microstructure. The results showed that the samples with an increased fraction of recrystallized grains exhibited better superplasticity and higher quality of the formed parts with a more uniform thickness distribution across the section than the samples with a lower initial recrystallized fraction.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2020.140626