Local mechanical properties of the (β0+ω0) composite in multiphase titanium aluminides studied with nanoindentation at room and high temperatures

High temperature nanoindentation was conducted on a Ti‐44.5Al‐6.25Nb‐0.8Mo‐0.1B (in at.%) alloy from room temperature up to 600°C to determine the temperature dependence of the local mechanical properties of the individual phases in a multiphase titanium aluminide alloy. The hardness of the (β0+ω0)...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2016-05, Vol.665, p.135-140
Main Authors: Kolb, M., Wheeler, J.M., Mathur, H.N., Neumeier, S., Korte-Kerzel, S., Pyczak, F., Michler, J., Göken, M.
Format: Article
Language:English
Subjects:
Aluminides
Dislocations
Electron microscopy
Intermetallics
Mechanical properties
Multiphase
Nanoindentation
Phases
Titanium base alloys
Titanium compounds
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Summary:High temperature nanoindentation was conducted on a Ti‐44.5Al‐6.25Nb‐0.8Mo‐0.1B (in at.%) alloy from room temperature up to 600°C to determine the temperature dependence of the local mechanical properties of the individual phases in a multiphase titanium aluminide alloy. The hardness of the (β0+ω0) composite is the highest among all phases and remains constant with increasing temperature, thus the (β0+ω0) composite does not decrease the strength of the alloy even at near service temperatures. A Burgers vector analysis in TEM of the deformed volume under the residual imprints after indentation at room temperature and 600°C showed that the plastic deformation occurs mainly by -type dislocations in the β0 phase. The high hardness of the (β0+ω0) composite can be attributed to a hardening effect of ω0 precipitates.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2016.04.026