Deformation Behavior and Structure of i-Al-Cu-Fe Quasicrystalline Alloy in Vicinity of Nanoindenter Indentation

The nanoindentation tests have been carried out for the quasicrystalline polygrain Al 62.4 Cu 25.3 Fe 12.3 alloy with the icosahedral structure i ; the load P -displacement h diagrams have been used to estimate the contributions of plastic deformation (monotonic and intermittent), and the structures...

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Bibliographic Details
Published in:Physics of the solid state 2018-02, Vol.60 (2), p.312-319
Main Authors: Shalaeva, E. V., Selyanin, I. O., Smirnova, E. O., Smirnov, S. V., Novachek, D. D.
Format: Article
Language:English
Subjects:
ALLOYS
ALUMINIUM COMPOUNDS
Aluminum base alloys
Beta phase
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Copper base alloys
COPPER COMPOUNDS
CRACKS
DEFORMATION
Deformation effects
DISLOCATIONS
ELECTRON MICROSCOPY
Ferrous alloys
Icosahedral phase
Indentation
IRON COMPOUNDS
Mechanical Properties
Nanoindentation
Nanoindenters
NANOSTRUCTURES
PHASE TRANSFORMATIONS
Phase transitions
Physics
Physics and Astronomy
Physics of Strength
Plastic deformation
PLASTICITY
Solid State Physics
Specialty metals industry
SYMMETRY
TERNARY ALLOY SYSTEMS
THIN FILMS
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Summary:The nanoindentation tests have been carried out for the quasicrystalline polygrain Al 62.4 Cu 25.3 Fe 12.3 alloy with the icosahedral structure i ; the load P -displacement h diagrams have been used to estimate the contributions of plastic deformation (monotonic and intermittent), and the structures of the transverse microscopic sections have been studied in the vicinity of indentations by electron microscopy. It is shown that several systems of deformation bands are formed in the elasto-plastic zone in the vicinity of the indentations along the close-packed planes of the i lattice with the five-fold and two-fold symmetry axes; the bands often begin from cracks and manifest the signs of the dislocation structure. The traces of the phase transformation with the formation of the β-phase areas are observed only in a thin layer under an indenter. The effects of intermittent deformation are up to 50% of the total inelastic deformation and are related to the plastic behavior of the quasicrystal-activation and passage of deformation bands and also the formation of undersurface micro- and nanosized cracks.
ISSN:1063-7834
1090-6460
DOI:10.1134/S1063783418020233