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Analysis of local microstructure after shear creep deformation
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SYSNO ASEP 0354833 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Analysis of local microstructure after shear creep deformation Author(s) Peter, D. (DE)
Viswanathan, G.B. (US)
Dlouhý, Antonín (UFM-A) RID, ORCID
Eggeler, G. (DE)Number of authors 4 Source Title Acta Materialia. - : Elsevier - ISSN 1359-6454
Roč. 58, č. 19 (2010), s. 6431-6443Number of pages 13 s. Language eng - English Country GB - United Kingdom Keywords Titanium aluminides ; Shear creep deformation ; Transmission electron microscopy ; Dislocations ; Twinning Subject RIV JG - Metallurgy R&D Projects GA106/07/0762 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z20410507 - UFM-A (2005-2011) UT WOS 000283807900023 DOI 10.1016/j.actamat.2010.08.005 Annotation 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. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2011
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