Mechanisms of precipitation induced by large strains in the Al-Cu system

Nasedkina, Y.; Sauvage, Xavier; Bobruk, Elena V.; Murashkin, M. Yu.; Valiev, Ruslan Z.; Enikeev, Nariman A.

doi:10.1016/j.jallcom.2017.03.312

Cited by 55 publications

(36 citation statements)

References 57 publications

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“…In addition to recovery processes, that takes place during annealing, HPT at 200 °C also generates higher vacancies density which accelerates the solid solution dissipation process …”

Section: Resultsmentioning

confidence: 99%

Optimization of Strength‐Electrical Conductivity Properties in Al–2Fe Alloy by Severe Plastic Deformation and Heat Treatment

et al. 2017

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High-pressure torsion at room temperature followed by two processing routes, either 1) annealing at 200 C for 8 h or 2) elevated temperature (200 C) high-pressure torsion, are employed to obtain simultaneous increase in mechanical strength and electrical conductivity of Al-2 wt%Fe. The comparative study of microstructure, particle distribution, mechanical properties, and electrical conductivity for both processing routes gives the optimal combination of high mechanical strength and high electrical conductivity in Al-2Fe alloy. It is shown that while the mechanical strength is approximately the same for both processing routes (>320 MPa), high-pressure torsion at elevated temperature results in higher conductivity (!52% IACS) due to reduction of Fe solute atom concentration in Al matrix compared to annealing treatment. High-pressure torsion at 200 C has been demonstrated as a new and effective way for obtaining combination of high mechanical strength and electrical conductivity in Al-Fe alloys.

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“…In addition to recovery processes, that takes place during annealing, HPT at 200 °C also generates higher vacancies density which accelerates the solid solution dissipation process …”

Section: Resultsmentioning

confidence: 99%

Optimization of Strength‐Electrical Conductivity Properties in Al–2Fe Alloy by Severe Plastic Deformation and Heat Treatment

et al. 2017

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“…Materials processed by SPD are characterized by high dislocation densities, 3) "non-equilibrium" grain boundaries 11) and high vacancy concentrations. 51,52) All these defects may influence the atomic mobility: dislocations could drag solutes 53) or act as diffusion pipes; 54) GBs are also fast diffusion paths 12) and could drag solute when they move during the deformation, 23,24,42) and at last, strain induced vacancies will directly enhance the atomic diffusion. 27) These respective contributions have been reviewed in Ref.…”

Section: Fundamental Mechanismsmentioning

confidence: 99%

Strain Induced Segregations in Severely Deformed Materials

2019

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Severely deformed materials intrinsically contain a large density of crystalline defects like dislocations or boundaries. The interactions between solute atoms or impurities with these defects play a key role in the grain refinement mechanisms as they affect dynamic recovery. This short review manuscript focusses on grain boundary segregations resulting from severe plastic deformation. The important contribution of atom probe tomography for the quantitative characterization of such segregations in various metallic alloys is at first highlighted. Then, a special emphasis is given on the physical mechanisms leading to strain induced segregations and on the connection that is sometimes observed with dynamic precipitation during severe plastic deformation. The last section is devoted to the influence of such grain boundary segregations in ultrafine grained alloys on the mechanical properties and on the thermal stability. [

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“…A popular way to achieve ultrafine grained (UFG) or nanoscale structures (NS) is the application of severe plastic deformation (SPD) processes (such as equal channel angular pressing (ECAP) or high-pressure torsion (HPT)) that have been intensively studied during the last two decades [7]. One should note that such processes can also lead to specific strain induced structural features, such as grain boundary segregation [8], phase transitions [6,9,10] or dynamic precipitation [11,12]. Moreover, the precipitation sequence and the aging kinetics are often significantly affected in such UFG structures [11,[13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…One should note that such processes can also lead to specific strain induced structural features, such as grain boundary segregation [8], phase transitions [6,9,10] or dynamic precipitation [11,12]. Moreover, the precipitation sequence and the aging kinetics are often significantly affected in such UFG structures [11,[13][14][15][16][17][18]. The influence of SPD on grain refinement and precipitation has been reported for Cu -Cr, Cu -Co and Cu -Ag alloys [2,3,5,6,10].…”

Section: Introductionmentioning

confidence: 99%

Microstructure, mechanical properties and aging behaviour of nanocrystalline copper–beryllium alloy

Lomakin

Castillo-Rodríguez

Sauvage

2019

Materials Science and Engineering: A

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A complex study of aging kinetics for both coarse-grained and nanostructured by severe plastic deformation Cu -2 wt.% Be alloy is reported. It is shown that aging of a coarse-grained alloy leads to continuous formation of nanosized CuBe body centred cubic (bcc, CsCltype) semi-coherent particles with the {220} Cu // {200} CuBe crystallographic orientation relationship. These particles created significant internal stress fields and became obstacles for dislocation glide that resulted in a change in the hardness from 95 Vickers hardness (HV) for the solubilized alloy to 400 HV for the aged one. The severe plastic deformation led to the formation of a single-phase nanograined microstructure with an average grain size of 20 nm and 390 HV. It was found that this grain size was slightly driven by grain boundary segregation. Further aging of the nanocrystalline alloy led to the discontinuous formation of precipitates on the former Cu grain boundaries and skipping of metastable phases. Significant age hardening with a maximum hardness of 466 HV for the aged nanostructured alloy was observed.Mechanical tests result revealed a strong influence of microstructure and further aging on strength capability of the alloy for both coarse-grained and nanostructured alloy. A good thermal stability in the nanostructured alloy was also noticed. Theoretical calculations of the hardness value for the CuBe phase are provided. It was shown that Be as a light alloying elements could be used for direct change of microstructure and aging behaviour of severely deformed copper alloys.

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Mechanisms of precipitation induced by large strains in the Al-Cu system

Cited by 55 publications

References 57 publications

Optimization of Strength‐Electrical Conductivity Properties in Al–2Fe Alloy by Severe Plastic Deformation and Heat Treatment

Optimization of Strength‐Electrical Conductivity Properties in Al–2Fe Alloy by Severe Plastic Deformation and Heat Treatment

Strain Induced Segregations in Severely Deformed Materials

Microstructure, mechanical properties and aging behaviour of nanocrystalline copper–beryllium alloy

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