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Evolution of microstructures during creep in TiAl-base intermetallics with a different Nb content
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SYSNO ASEP 0440417 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Evolution of microstructures during creep in TiAl-base intermetallics with a different Nb content Author(s) Dlouhý, Antonín (UFM-A) RID, ORCID
Orlová, Alena (UFM-A)
Kuchařová, Květa (UFM-A) RID, ORCIDNumber of authors 3 Source Title 15th International Conference on the Strength of Materials (ICSMA-15). - Bristol : IOP Publishing, 2010 / Skrotzki W. ; Oertel CG. ; Biermann H. ; Heilmaier M. - ISSN 1742-6588 Pages art. no. 012091 Number of pages 6 s. Publication form Online - E Action ICSMA 15 - International Conference on the Strength of Materials /15./ Event date 16.08.2009-21.08.2009 VEvent location Dresden Country DE - Germany Event type WRD Language eng - English Country GB - United Kingdom Keywords intermetallics ; creep ; TiAl Subject RIV JG - Metallurgy R&D Projects GA106/07/0762 GA ČR - Czech Science Foundation (CSF) 1QS200410502 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z20410507 - UFM-A (2005-2011) UT WOS 000286515800091 EID SCOPUS 78651062618 DOI 10.1088/1742-6596/240/1/012091 Annotation An evolution of microstructure has been investigated with increasing compression creep strain in intermetallic alloys Ti-48Al-2Cr-2Nb-1B (alloy Nb2) and Ti-46Al-7Nb-0.6Cr-0.2Ni-0.1Si (alloy Nb7) loaded to 350 MPa at 973 K. Scanning electron microscopy and transmission electron microscopy analysis focused on individual deformation modes and on the phase stability of the alloys. Dislocation densities and deformation twinning characteristics were systematically evaluated for strains up to 0.38. Results of these quantitative studies showed that the evolution of total and non-zero c -component dislocation densities with strain was similar for all the investigated materials in spite of relevant differences in the initial gamma/alpha 2 microstructures. However, the spacing between deformation twins seemed to scale with the creep strength of the two alloys. These results are discussed in terms of the fundamental deformation modes and their contributions to the strain accumulation kinetics during high temperature creep in TiAl-base intermetallics with a different Nb content. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2015
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