Počet záznamů: 1
Analysis of local microstructure after shear creep deformation
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SYSNO ASEP 0354833 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Analysis of local microstructure after shear creep deformation Tvůrce(i) Peter, D. (DE)
Viswanathan, G.B. (US)
Dlouhý, Antonín (UFM-A) RID, ORCID
Eggeler, G. (DE)Celkový počet autorů 4 Zdroj.dok. Acta Materialia. - : Elsevier - ISSN 1359-6454
Roč. 58, č. 19 (2010), s. 6431-6443Poč.str. 13 s. Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova Titanium aluminides ; Shear creep deformation ; Transmission electron microscopy ; Dislocations ; Twinning Vědní obor RIV JG - Hutnictví, kovové materiály CEP GA106/07/0762 GA ČR - Grantová agentura ČR CEZ AV0Z20410507 - UFM-A (2005-2011) UT WOS 000283807900023 DOI 10.1016/j.actamat.2010.08.005 Anotace The present work characterizes the microstructure of a hot-extruded Ti–45Al–5Nb–0.2B–0.2C (at.%) alloy with a fine-grained duplex microstructure after shear creep deformation (temperature 1023 K; shear stress 175 MPa; shear deformation 20%). Diffraction contrast transmission electron microscopy (TEM) was performed to identify ordinary dislocations, superdislocations and twins. The microstructure observed in TEM is interpreted taking into account the contribution of the applied stress and coherency stresses to the overall local stress state. Lamellar c grains can be in soft and hard orientations with respect to the resolved shear stress provided by the external load. The presence of twins can be rationalized by the superposition of the applied stress and local coherency stresses. The presence of superdislocations in hard c grains represents indirect evidence for additional contributions to the local stress state associated with stress redistribution during creep. Pracoviště Ústav fyziky materiálu Kontakt Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Rok sběru 2011
Počet záznamů: 1