Počet záznamů: 1
On the stress and temperature dependence of low temperature and high stress shear creep in Ni-base single crystal superalloys
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SYSNO ASEP 0534084 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název On the stress and temperature dependence of low temperature and high stress shear creep in Ni-base single crystal superalloys Tvůrce(i) Bürger, D. (DE)
Dlouhý, Antonín (UFM-A) RID, ORCID
Yoshimi, K. (JP)
Eggeler, G. (DE)Celkový počet autorů 4 Číslo článku 139961 Zdroj.dok. Materials Science and Engineering A Structural Materials Properties Microstructure and Processing. - : Elsevier - ISSN 0921-5093
Roč. 795, SEP (2020)Poč.str. 10 s. Jazyk dok. eng - angličtina Země vyd. CH - Švýcarsko Klíč. slova steady-state creep ; electron-microscopy ; power-law ; microstructure ; deformation ; anisotropy ; reduction ; metals ; faults ; Ni-base superalloy single crystals ; Shear creep deformation ; Low-temperature high-stress creep ; Stress exponent ; Activation energy ; Dislocation mechanisms Vědní obor RIV JG - Hutnictví, kovové materiály Obor OECD Materials engineering CEP EF16_025/0007304 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy Způsob publikování Open access Institucionální podpora UFM-A - RVO:68081723 UT WOS 000573282500001 EID SCOPUS 85088875133 DOI 10.1016/j.msea.2020.139961 Anotace In the present work, we investigate the stress and temperature dependence of low-temperature (750 + 20 degrees C) and high-stress (300 + 20 MPa) shear creep of a Ni-base single crystal superalloy. From continuous isothermal experiments and stress and temperature change tests the stress exponent n and the apparent activation energy Q(app) of the phenomenological Sherby-Dorn equation were determined for the two macroscopic crystallographic shear systems (MCSS) [01 (1) over bar](111) and [11 (2) over bar] (111). The activation parameters of creep, the stress exponents and the apparent activation energies were identified as 16 and 620 kJ/mol (MCSS: [01 (1) over bar](111)) and 14 and 460 kJ/mol (MCSS: [11 (2) over bar] (111)). We show that during shear creep testing these phenomenological parameters do not change between the early (0.5-1% strain) and later stages of creep (4.5-5% strain), in contrast to what was observed for uniaxial tensile testing. The results are discussed in the light of what is known about stress and temperature dependencies of deformation rates in the creep literature and in view of the recent work by Burger et al., 2020, who combined shear creep testing with analytical transmission electron microscopy to identify the elementary deformation mechanism, which governs low temperature and high stress creep. Pracoviště Ústav fyziky materiálu Kontakt Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Rok sběru 2021 Elektronická adresa https://www.sciencedirect.com/science/article/pii/S0921509320310339?via%3Dihub
Počet záznamů: 1