Analysis of the effective and internal cyclic stress components in cast gama–TiAl based alloy

0435368 - ÚFM 2015 RIV US eng C - Conference Paper (international conference)
Petrenec, Martin - Polák, Jaroslav - Kruml, Tomáš - Buček, Petr
Analysis of the effective and internal cyclic stress components in cast gama–TiAl based alloy.
3rd International Conference on Heterogeneous Material Mechanics (ICHMM 2011). Lancaster: Destech Publications, 2011 - (Fan, J.; Zhang, J.; Chen, H.; Jin, Z.), s. 921-924. Advances in Heterogeneous Materials Mechanics, 921-924. ISBN 978-1-60595-054-9.
[ICHMM 2011 International Conference on Heterogeneous Material Mechanics /3./. Shanghai (CN), 22.05.2011-26.05.2011]
R&D Projects: GA ČR(CZ) GAP107/11/0704
Institutional research plan: CEZ:AV0Z20410507
Keywords : Low cycle fatigue * TiAl alloy * hysteresis loop * dislocation structure
Subject RIV: JL - Materials Fatigue, Friction Mechanics

Cyclic strain controlled multiple step tests in air have been performed on cylindrical specimens of cast gama-based alloy Ti–48Al–2Nb–2Cr–0.82B at. % with nearly lamellar microstructure of gamaandalpha2 phases at 23 and 750 °C. The objective was to analyze the internal and effective cyclic stress components which were derived from the hysteresis loops analyzed according to the statistical theory of hysteresis loop. Dislocation structures in cyclically strained specimens at room temperature were observed using TEM. Cyclic response at both temperatures was compared and discussed in relation to changes of internal and effective stress components and dislocation modes in gamaphase observed and referred in the literature.
Permanent Link: http://hdl.handle.net/11104/0239448