Crack nucleation and elastic / plastic deformation of TiAl alloys investigated by in-situ loaded atomic force microscopy

The crack propagation mechanisms of γ-titanium aluminides with fully lamellar microstructure have been studied using in-situ deformation in the Atomic Force Microscope (AFM). AFM demonstrated the unique capability to detect elastic as well as plastic deformation during in-situ tests from topography...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2017-03, Vol.689, p.11-16
Main Authors: Iqbal, F., Pyczak, F., Neumeier, S., Göken, M.
Format: Article
Language:English
Subjects:
AFM
Atomic force microscopes
Atomic force microscopy
Crack initiation
Crack nucleation
Crack propagation
Deformation mechanisms
Elastic deformation
Elastic/plastic deformation
Fracture mechanics
In-situ observation
Intermetallic compounds
Microstructure
Nucleation
Plastic deformation
TiAl
Titanium aluminides
Titanium aluminum alloys
Titanium base alloys
Titanium compounds
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Summary:The crack propagation mechanisms of γ-titanium aluminides with fully lamellar microstructure have been studied using in-situ deformation in the Atomic Force Microscope (AFM). AFM demonstrated the unique capability to detect elastic as well as plastic deformation during in-situ tests from topography changes on the surface. It was found that the crack nucleation, which can occur at γ/γ and α2/γ interfaces as well as inside the γ-phase, is always preceded by strong local elastic deformation. No cracking inside the α2-phase was observed. The elastic and plastic deformation was confined inside the γ-phase and especially pronounced near interfaces which can be explained by the differences of the elastic and plastic deformation behavior of the γ- and α2- phase.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2017.02.017