Influence of megaplastic deformation on the structure and hardness of Al–Cu–Mg alloy after aging

Петрова, А. Н.; Radziszewska, H.; Kaczmarek, Ł.; Klih, M.; Бродова, И. Г.; Stegliński, M.

doi:10.1134/s0031918x16120103

Cited by 11 publications

(7 citation statements)

References 21 publications

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“…Phases such as Al 7 CuFe 2 , Al 6 MnFe 2 , (Al,Cu) 6 Mn, Al 6 (Cu,Fe,Mn), Al 8 Fe 2 Si, Al 10 Fe 2 Si or Al 12 (Fe,Mn) 3 Si were previously found among particles similar to those found in this study [5,[18][19][20]. The latest research concluded that most of the phases recognized as large intermetallics in this alloy can be described by the formula Al 3 (Cu x Fe y Mn 1−x−y ), where 0.45 < x < 0.86, 0.15 < y < 0.32, and 0.1 < 1 − x − y < 0.5 [21,22]. In conclusion, since there is huge variation in the chemical composition of the particles, the authors decided to treat all of the particles as the same type in the nanoindentation measurements.…”

Section: Methodssupporting

confidence: 87%

Nanoindentation Study of Intermetallic Particles in 2024 Aluminium Alloy

et al. 2020

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Nanoindentation tests are useful for determining the local mechanical properties of materials. However, the method has its limitations, and its accuracy is strongly influenced by the nano-scale geometry of the indented area. The authors chose to perform measurements of the hardness and elastic modulus of intermetallic particles in 2024 aluminium alloys. The objective of this study was to investigate the influence of the particles’ depth and shape on the accuracy of the nanoindentation result. Several simulations were performed with the use of the finite element method on different geometries mirroring possible real-life configurations of the particle and matrix. The authors compared the force vs. deformation curves for all of the variants. The results showed that the nanoindentation process is different for a particle with the same mechanical properties depending on its depth under the investigated surface. Therefore, the measured values of hardness and elastic modulus for intermetallic particles are partly the result of interaction with a matrix.

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Section: Methodssupporting

confidence: 87%

Nanoindentation Study of Intermetallic Particles in 2024 Aluminium Alloy

et al. 2020

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“…In model alloys subjected to HPT, the evolution of the microstructure has features similar to those of the corresponding process in pure metals. During the deformation of alloys and intermetallides, not only a strong size refinement of the microstructure occurs but also do the changes in the phase and chemical composition associated with the (i) formation of supersaturated solid solutions, (ii) crushing of the second phase particles, and (iii) amorphization possible for some systems [104][105][106][107][108][109][110][111][112][113][114][115][116][117][118][119][120][121][122][123]. The formation of nanostructures in alloys is strongly affected by their phase composition.…”

Section: Basic Methods For Obtaining Bulk Nanostructured Materialsmentioning

confidence: 99%

“…Since the decomposition of solid solution in Al alloys, as a rule, is ahead of grain growth, this is successfully used to improve the structure and properties of nanostructured materials. These processes have been extensively studied in the course of SPD of aging Al alloys of different systems: Al-Cu [104,105], Al-Cu-Mg [106][107][108], Al-Mg-Si [109][110][111][112], and Al-Zn-Mg [113][114][115][116][117], including also Al-Li [112,[118][119][120][121][122]. The temperatures at which certain processes of structure evolution occur depend primarily on the chemical composition, the structure of the material, and the applied SPD methods that determine the features of the deformation substructure.…”

Section: Basic Methods For Obtaining Bulk Nanostructured Materialsmentioning

confidence: 99%

Multicomponent Aging Al-Li-Based Alloys of the Latest Generation: Structural and Phase Transformations, Treatments, Properties, and Future Prospects

et al. 2022

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An overview of modern material science problems is presented for ultralightweight high-modulus commercial Al-Li-based alloys in historical retrospect. Numerous particular examples of the Soviet and Russian aviation whose various designs were made of these alloys confirm their successful innovative potential. The key regularities of multicomponent alloying are discussed for the master alloys and modern commercial Al-Li-based alloys of the latest generation; the features typical of their microstructures, phase composition, and properties formed during aging are analyzed. The main mechanisms of phase formation are generalized for standard thermal and thermomechanical treatments. Recent original achievements have been obtained in designing of unique structural and phase transformations in these commercial alloys by means of methods of severe plastic deformations followed by heat treatment and storage. Using the example of three Russian commercial alloys of last generation, the basic principles of creating and controlling an ultrafine-grained structure, the origin and growth of stable nanophases of various types and chemical composition that determine the physicomechanical properties of alloys are established.

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“…As shown by studies of Al-Li and Al-Sc alloys, single-phase precipitates are not the only precipitates that harden the aluminium alloy. Studies have proven that skilful heat treatment (T6I6) in alloys with sublimed chemical compositions enables the nucleation and growth of precipitates with a two-phase structure of the core and shell [5][6][7][8][9]. As indicated by studies, the formation of precipitates with a two-phase structure results in a stronger hardening of the alloy due to the greater dispersion of phases and the shells that surround them.…”

Section: Introductionmentioning

confidence: 99%

Effect of T6I6 tempering on the coherence between core/shell precipitates and a solid solution in the 2024 aluminium alloy

Stegliński,

Petrova,

Brodova

et al. 2024

Mater. Res. Express

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Heat treatment of materials, including, in particular, the two-stage T6I6 treatment, enables the nucleation of precipitates with a two-phase structure: core and shell. The above-mentioned treatment can be used to harden materials by selecting suitable treatment parameters and chemical composition of the material that initiate a selective diffusion of the alloying elements. In this paper, tests of the T6I6 treatment were carried out on the EN AW-2024 alloy. The aluminium alloy was subject to T6I6 treatment and then the element distribution map was examined within the precipitate using the EDS method, mechanical properties of the precipitate were tested using the nanoindentation method and the kinetics of formation of the precipitate was analysed using DSC. The impact of two-phase precipitates on the mechanical properties has been determined through a static strength test, whereas the impact of the structure on the above-mentioned mechanical properties was determined based on HR-TEM observations. The results of the study confirm the formation of a precipitate with a two-phase structure (shell; core) in the EN AW-2024 alloy as well as the kinetics of their formation as a function of the parameters of the T6I6 process, such as temperature, duration and cooling rate. Strength tests have confirmed an increase in strength of the alloy to Rm = 520 MPa, with elongation remaining the same at A = 13.2%. HR-TEM observations, in turn, prove that the shell forming on the core is coherent with solid solution α, which means that the hardening of the alloy may occur as a sum of the Mott-Nabarro, Friedel and Ashby-Orowan mechanisms.

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Influence of megaplastic deformation on the structure and hardness of Al–Cu–Mg alloy after aging

Cited by 11 publications

References 21 publications

Nanoindentation Study of Intermetallic Particles in 2024 Aluminium Alloy

Nanoindentation Study of Intermetallic Particles in 2024 Aluminium Alloy

Multicomponent Aging Al-Li-Based Alloys of the Latest Generation: Structural and Phase Transformations, Treatments, Properties, and Future Prospects

Effect of T6I6 tempering on the coherence between core/shell precipitates and a solid solution in the 2024 aluminium alloy

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