Počet záznamů: 1
Investigation of titanium alloys using neutron diffraction
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SYSNO ASEP 0557372 Druh ASEP D - Dizertace Zařazení RIV Záznam nebyl označen do RIV Název Investigation of titanium alloys using neutron diffraction Tvůrce(i) Németh, Gergely (UJF-V) SAI, ORCID Celkový počet autorů 1 Vyd. údaje Praha: Univerzita Karlova, Matematicko-fyzikální fakulta, 2021 Poč.str. 109 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. CZ - Česká republika Klíč. slova Titanium ; severe plastic deformation (SPD) ; residual stresses ; neutron diffraction ; deformation twinning Obor OECD Condensed matter physics (including formerly solid state physics, supercond.) Institucionální podpora UJF-V - RVO:61389005 DOI 20.500.11956/128397 Anotace Titanium grade 2 was treated by multiple passes of the continuous equalchannel angular pressing technique (CONFORM ECAP) and, after each pass, additionally by rotary swaging. The residual strain field in samples processed by only CONFORM ECAP was studied by neutron diffraction strain scanning. In order to elucidate the microscopic background and calculate the related residual stress field, the local microstructure was thoroughly investigated by various experimental techniques. The microstructure and the deformation behavior of the rotary swaged samples was studied by transmission electron microscopy and by in-situ neutron diffraction during compression. The results of the analyses indicated that microstructural gradients were present in the material as the result of the inhomogeneous deformation during the CONFORM ECAP treatment. These gradients were identified as the main reason of the presence of residual stress fields. The distributions of stress fields calculated based on microstructural parameters were in correlation with simulation results. The additional rotary swaging treatment resulted in a nanocrystalline grain structure with increasing homogeneity as the number of previous CONFORM ECAP passes increased. Deformation twinning was identified as a major deformation mechanism whose role was gradually reduced by the decreasing overall grain size. Pracoviště Ústav jaderné fyziky Kontakt Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Rok sběru 2023
Počet záznamů: 1