Počet záznamů: 1
Lattice defects in severely deformed biomedical Ti-6Al-7Nb alloy and thermal stability of its ultra-fine grained microstructure
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SYSNO ASEP 0502368 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Lattice defects in severely deformed biomedical Ti-6Al-7Nb alloy and thermal stability of its ultra-fine grained microstructure Tvůrce(i) Bartha, K. (CZ)
Zháňal, P. (CZ)
Stráský, J. (CZ)
Čížek, J. (CZ)
Dopita, M. (CZ)
Lukáč, František (UFP-V) ORCID
Harcuba, P. (CZ)
Hájek, M. (CZ)
Polyakova, V. (RU)
Semenova, I. (RU)
Janeček, M. (CZ)Celkový počet autorů 11 Zdroj.dok. Journal of Alloys and Compounds. - : Elsevier - ISSN 0925-8388
Roč. 588, 5. 6. 2019 (2019), s. 881-890Poč.str. 10 s. Jazyk dok. eng - angličtina Země vyd. NL - Nizozemsko Klíč. slova Electrical resistance ; Equal channel angular pressing ; Microstructure ; Positron annihilation spectroscopy ; Titanium alloys Vědní obor RIV JG - Hutnictví, kovové materiály Obor OECD Materials engineering CEP GA17-17016S GA ČR - Grantová agentura ČR Institucionální podpora UFP-V - RVO:61389021 UT WOS 000462767000101 EID SCOPUS 85062212035 DOI 10.1016/j.jallcom.2019.02.173 Anotace Biomedical Ti-6Al-7Nb alloy was prepared by a dedicated thermal treatment followed by equal-channel angular pressing (ECAP) and extrusion. Ultra-fine grained duplex microstructure consisting of deformed primary α-grains and fragmented α + β region was achieved. Microstructural changes during heating with the rate of 5 °C/min were studied by in-situ electrical resistance. Microstructure after deformation and also after subsequent heating was thoroughly characterized by scanning electron microscopy, X-ray diffraction, and positron annihilation spectroscopy (PAS). X-ray diffraction and positron annihilation spectroscopy proved a very high dislocation density and the presence of high concentration of vacancy clusters in deformed material. The ultra-fine grained microstructure of Ti-6Al-7Nb alloy is stable up to 440 °C, while upon heating to 550 °C and to 660 °C, the dislocation density decreases and vacancy clusters disappear. Enhanced microhardness can be achieved by ECAP followed by aging at 500 °C. Upon heating to 660 °C, the microhardness decreases due to ongoing recovery and recrystallization. Coincidence Doppler broadening (CDB), a special method of PAS, proved that dislocation cores are preferentially occupied by Al atoms that are known to cause substitutional solid solution strengthening. Pracoviště Ústav fyziky plazmatu Kontakt Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Rok sběru 2019 Elektronická adresa https://www.sciencedirect.com/science/article/pii/S0925838819306255?via%3Dihub
Počet záznamů: 1