Počet záznamů: 1
On the nature of γ′ phase cutting and its effect on high temperature and low stress creep anisotropy of Ni-base single crystal superalloys
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SYSNO ASEP 0435446 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název On the nature of γ′ phase cutting and its effect on high temperature and low stress creep anisotropy of Ni-base single crystal superalloys Tvůrce(i) Jácome, L. A. (DE)
Nörtershäuser, P. (DE)
Somsen, C. (DE)
Dlouhý, Antonín (UFM-A) RID, ORCID
Eggeler, G. (DE)Celkový počet autorů 5 Zdroj.dok. Acta Materialia. - : Elsevier - ISSN 1359-6454
Roč. 69, MAY (2014), s. 246-264Poč.str. 19 s. Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova Ni-base single crystal superalloys ; Creep ; Anisotropy ; Dislocation ; Rafting Vědní obor RIV JG - Hutnictví, kovové materiály Institucionální podpora UFM-A - RVO:68081723 UT WOS 000335110000024 EID SCOPUS 84896704779 DOI 10.1016/j.actamat.2014.01.021 Anotace The creep anisotropy of the single crystal superalloy LEK 94 deformed in tension along [001] and [110] directions at 1293 K and 160 MPa was investigated. Elementary microstructural processes which are responsible for a higher increase in creep rates with strain during [110] as compared to [001] tensile loading were identified. [110] tensile creep is associated with a higher number of gamma' phase cutting events, where two dislocations with equal Burgers vectors of type (110) jointly shear the gamma' phase. The resulting (220)-type superdislocation can move by glide. In contrast, during [001] tensile loading, two dislocations with different (110)-type Burgers vectors must combine for gamma' phase cutting. The resulting (200)-type superdislocations can only move by a combination of glide and climb. The evolution of dislocation networks during creep determines the nature of the gamma' phase cutting events. The higher [110] creep rates at strains exceeding 2% result from a combination of a higher number of cutting events (density of mobile dislocations in gamma') and a higher superdislocation mobility ((220) glide) in the gamma' phase. Pracoviště Ústav fyziky materiálu Kontakt Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Rok sběru 2015
Počet záznamů: 1