Počet záznamů: 1
On Local Phase Equilibria and the Appearance of Nanoparticles in the Microstructure of Single-Crystal Ni-Base Superalloys
- 1.
SYSNO ASEP 0464788 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název On Local Phase Equilibria and the Appearance of Nanoparticles in the Microstructure of Single-Crystal Ni-Base Superalloys Tvůrce(i) Yardley, V. (DE)
Povstugar, I. (DE)
Choi, P.-P. (DE)
Raabe, D. (DE)
Parsa, A. B. (DE)
Kostka, A. (DE)
Somsen, Ch. (DE)
Dlouhý, Antonín (UFM-A) RID, ORCID
Neuking, K. (DE)
George, E. P. (DE)
Eggeler, G. (DE)Celkový počet autorů 11 Zdroj.dok. Advanced Engineering Materials. - : Wiley - ISSN 1438-1656
Roč. 18, č. 9 (2016), s. 1556-1567Poč.str. 12 s. Jazyk dok. eng - angličtina Země vyd. DE - Německo Klíč. slova atom-probe tomography ; gamma/gamma-interfaces ; creep ; stress ; alloy Vědní obor RIV JG - Hutnictví, kovové materiály CEP GA14-22834S GA ČR - Grantová agentura ČR Institucionální podpora UFM-A - RVO:68081723 UT WOS 000382986100005 EID SCOPUS 84978880196 DOI 10.1002/adem.201600237 Anotace High-resolution characterization techniques are combined with thermodynamic calculations (CALPHAD) to rationalize microstructural features of single crystal Ni-base superalloys. Considering the chemical compositions of dendritic and interdendritic regions one can explain differences in γ′-volume fractions. Using thermodynamic calculations one can explain, why γ-nanoparticles are observed in the central regions of large cuboidal γ′-particles and why tertiary γ′-nanoparticles form in the γ-channels. The chemical compositions of the γ-channels and of the newly formed γ-particles differ because of the Gibbs–Thomson pressure which acts on the small particles. With increasing size of secondary γ′-particles, their shape changes from spherical to cuboidal. Some general thermodynamic aspects including the temperature dependencies of the Gibbs free energy G, the enthalpy H, and the entropy S and site occupancies in the ordered L12 (γ′) phase are considered. The importance of cooling rate after homogenization is discussed. Pracoviště Ústav fyziky materiálu Kontakt Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Rok sběru 2017
Počet záznamů: 1