Pressure-enforced plasticity in MAX phases: from single grain to polycrystal investigation

Ti 4 AlN 3 , Ti 3 AlC 2 and Ti 3 Al 0.8 Sn 0.2 C 2 MAX phases were plastically deformed at room temperature (RT) under gaseous confining pressure. Microstructures of as-grown and deformed samples are carefully analysed using scanning electron microscopy (SEM), atomic force microscopy (AFM) and trans...

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Bibliographic Details
Published in:Philosophical magazine (Abingdon, England) England), 2013-05, Vol.93 (15), p.1784-1801
Main Authors: Bei, Guo-Ping, Guitton, Antoine, Joulain, Anne, Brunet, Véronique, Dubois, Sylvain, Thilly, Ludovic, Tromas, Christophe
Format: Article
Language:English
Subjects:
Chemical Sciences
Condensed matter: structure, mechanical and thermal properties
Confining
Cross-disciplinary physics: materials science
rheology
Defects and impurities in crystals
microstructure
Deformation
Deformation, plasticity, and creep
Dislocations
Engineering Sciences
Exact sciences and technology
Grains
Linear defects: dislocations, disclinations
Material chemistry
Materials science
MAX phases
microstructure
Phases
Physics
Plastic deformation
plasticity
powder metallurgy
Scanning electron microscopy
Structure of solids and liquids
crystallography
Transmission electron microscopy
Treatment of materials and its effects on microstructure and properties
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Summary:Ti 4 AlN 3 , Ti 3 AlC 2 and Ti 3 Al 0.8 Sn 0.2 C 2 MAX phases were plastically deformed at room temperature (RT) under gaseous confining pressure. Microstructures of as-grown and deformed samples are carefully analysed using scanning electron microscopy (SEM), atomic force microscopy (AFM) and transmission electron microscopy (TEM). It is demonstrated that high level of plastic deformation can be reached under confining gas pressure; the later suppresses the brittle failure at RT to the profit of plasticity. Multiscale characterization techniques are shown to provide a unique insight into all the scales of the plastic deformation; in particular, the effect of the mesoscale. Indeed, grain shape and orientation relative to the compression axis are shown to play a key role in the deformation process, intergranular stresses leading to a complex stress field in the polycrystalline samples. The TEM results show that dislocation activity highly depends on the grain orientation. The observation of dislocation entanglements unambiguously demonstrates that dislocations may be organized in such a configuration so that their glide in the basal plane can be hindered when deep plastic regime is reached.
ISSN:1478-6435
1478-6443
1478-6433
DOI:10.1080/14786435.2012.755272