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Effect of addition of Mo and C on microstructure and properties of TiAl alloys with high Nb content
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SYSNO ASEP 0449845 Document Type A - Abstract R&D Document Type Není vybrán druh dokumentu Title Effect of addition of Mo and C on microstructure and properties of TiAl alloys with high Nb content Author(s) Chlupová, Alice (UFM-A) RID, ORCID
Kruml, Tomáš (UFM-A) RID, ORCID
Heczko, Milan (UFM-A) ORCID
Beran, Přemysl (UJF-V) RID, ORCID, SAI
Polák, Jaroslav (UFM-A) RID, ORCIDNumber of authors 5 Source Title Book of Abstracts. 17th International Conference on the Strength of Materials (ICSMA-17). - Brno : Ústav fyziky materiálů AV ČR, v. v. i., 2015 / Dlouhý A. ; Kunz L. - ISBN 978-80-87434-07-9
S. 49-49Number of pages 1 s. Publication form Print - P Action ICSMA-17 International Conference on the Strength of Materials /17./ Event date 09.08.2015-14.08.2015 VEvent location Brno Country CZ - Czech Republic Event type WRD Language eng - English Country CZ - Czech Republic Keywords titanium aluminides ; microstructure ; mechanical properties ; electron microscopy ; fatigue Subject RIV JL - Materials Fatigue, Friction Mechanics Subject RIV - cooperation Nuclear Physics Institute - Solid Matter Physics ; Magnetism R&D Projects GAP107/11/0704 GA ČR - Czech Science Foundation (CSF) ED1.1.00/02.0068 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UFM-A - RVO:68081723 ; UJF-V - RVO:61389005 Annotation Six grades of TiAl alloy with 7% of Nb and doped with C and/or Mo were prepared. The effect of element addition on microstructure and phase composition was characterized using electron microscopy and neutron diffraction. The alloys had substantially different microstructure. Common feature of all materials were domains with alternating lamellae of γ and α2 phases. Presence of ordered β0 phase in the form of islands was observed in Mo containing alloys. The biggest amount of β0 phase evaluated using neutron diffraction was about 15% for material doped with 2% of Mo. Both SEM and TEM studies confirmed that in alloys containing carbon no β0 phase was observed. Microstructure of alloys with both Mo and C contained large islands of γ phase and small islands of β0 phase often connected to lamellae of γ and α2 phase. Monotonic properties were measured at ambient and elevated temperature. Tensile elongation of all alloys was rather limited at both temperatures however some materials exhibited reasonably good plasticity in compression at 750°C. The highest tensile strength was measured in the case of alloy doped with 0.5% C both at 750°C and RT. Results concerning ductility suggested that material with highest amount of β0 phase exhibited the highest values of plastic deformation at fracture. The differences in microstructure resulted also in differences in yield stress at 750°C, which varied from 443 to 628 MPa. Low cycle fatigue behavior was studied and cyclic stress-strain curve was assessed using short-cut procedure. Loading with low levels of applied strain amplitude resulted in a stable behavior or small cyclic hardening. Materials cycled with high strain amplitudes at 750°C exhibited initial cyclic softening. The highest cyclic stress-strain curve at RT had material doped with 0.5% C. The cyclic deformation characteristics of alloys doped with C and Mo at 750°C were similar, nevertheless, the highest cyclic stresses were measured for carbon containing material. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2016
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