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In-Situ Synchrotron X-Ray Diffraction of Ti-6Al-4V During Thermomechanical Treatment in the Beta Field
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SYSNO ASEP 0508928 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title In-Situ Synchrotron X-Ray Diffraction of Ti-6Al-4V During Thermomechanical Treatment in the Beta Field Author(s) Warchomicka, F. (AT)
Canelo-Yubero, David (UJF-V) ORCID, SAI
Zehetner, E. (AT)
Requena, G. (DE)
Stark, A. (DE)
Poletti, C. (AT)Number of authors 6 Article number 862 Source Title Metals. - : MDPI
Roč. 9, č. 8 (2019)Number of pages 14 s. Publication form Print - P Language eng - English Country CH - Switzerland Keywords Ti-6Al-4V ; hot deformation ; heat treatment ; in-situ high energy X-ray diffraction ; microstructure ; recrystallization Subject RIV BM - Solid Matter Physics ; Magnetism OECD category Condensed matter physics (including formerly solid state physics, supercond.) Method of publishing Open access Institutional support UJF-V - RVO:61389005 UT WOS 000484510000052 EID SCOPUS 85071030559 DOI 10.3390/met9080862 Annotation This work aims to identify the mechanisms of restoration occurring in Ti-6Al-4V during hot plastic deformation and subsequent heat treatment. The allotropic phase transformation that occurs during cooling distorts the interpretation of the restoration mechanisms taking place at high temperatures. Therefore, analysis of deformed samples by conventional microscopy have led to controversies in the interpretation of the main dynamic restoration mechanism. Additionally, static restoration of the microstructure can occur during slow cooling, modifying the microstructure. These facts were mainly the reasons why discontinuous dynamic recrystallization and/or dynamic recovery has been reported as the main dynamic restoration mechanism for Ti-6Al-4V. In this work, we use in-situ synchrotron X-ray diffraction combined with conventional microscopy to determine the dynamic and static mechanisms of restoration during and after deformation at different strain rates. The results show dynamic recovery as main mechanism of restoration during deformation in the beta field, denoted by sub-grain formation and a misorientation dependency of the strain rate. After deformation, static recrystallization, grain growth, and coarsening of the beta grains can be observed, especially at strain rates higher than 0.1 s(-1). It is also demonstrated that the nucleation of new grains can occur within the very first seconds of the isothermal heat treatment. Workplace Nuclear Physics Institute Contact Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Year of Publishing 2020 Electronic address https://doi.org/10.3390/met9080862
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