Effect of thermomechanical treatment on the microstructure, phase composition, and mechanical properties of Al–Cu–Mn–Mg–Zr alloy

Zuiko, Ivan; Газизов, М. Б.; Kaibyshev, Rustam

doi:10.1134/s0031918x16090088

Cited by 34 publications

(35 citation statements)

References 31 publications

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“…%) lower than~1.73 will produce the equilibrium θ-, Qphases, as well as pure Si particles at long aging times. In several Al--Cu-Mg-Si alloys [2,6], the prior precipitation sequence related with the θ-phase includes GP (Guinier-Preston) zones (or GPI), θ''(or GPII) and θ'-phases [3,4,[9][10][11][12][13][14][15][16]. It has been shown [3,16,17] that among these precipitates the disperse θ'-phase plates are highly efficient in strengthening.…”

Section: Introductionmentioning

confidence: 99%

“…In several Al--Cu-Mg-Si alloys [2,6], the prior precipitation sequence related with the θ-phase includes GP (Guinier-Preston) zones (or GPI), θ''(or GPII) and θ'-phases [3,4,[9][10][11][12][13][14][15][16]. It has been shown [3,16,17] that among these precipitates the disperse θ'-phase plates are highly efficient in strengthening. The situation with the quaternary Q-phase having composition proposed in a range from Al 3 Cu 2 Mg 9 Si 7 to Al 5 Cu 2 Mg 8 Si 6 [18,19] is more complicated due to diverse metastable AlCuMgSi (or AlMgSiCu) phases identified in a wide compositional range of commercial Al-Cu-Mg-Si (2XXX series) and Al-Mg-Si-Cu (6XXX series) alloys [2].…”

Section: Introductionmentioning

confidence: 99%

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Precipitation behavior in an Al–Cu–Mg–Si alloy during ageing

Газизов

Marioara

Friis

et al. 2019

Materials Science and Engineering: A

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wt. %) alloy was examined in detail after aging at 170°C with different dwell times up to 96 h. Deformation by 3%stretching prior to aging was used to investigate the effect of dislocations on phase and hardness evolution and compared with the undeformed material. The small pre-deformation led to a slight decrease of peak strength due to reduced homogenous nucleation. Strong interaction between different phases caused the formation of hybrid structures both in the undeformed bulk areas and on dislocations. These phases consist of different fragments of the GP zones, θ"and θ'-phases from the Al-Cu system, GPB zones and S1-phase from the Al-Cu-Mg system, and β"-, β'-Cu, C-and Q'-phases from the Al-Mg-Si-Cu system. A new phase named C1, isostructural to the C-phase but having a different orientation with the Al matrix -(010) C //(010) Al , [001] C //[101] Al , has been found predominantly on dislocation lines, and to a lesser extent in hybrid precipitates in the bulk. Calculations of structural stability by density functional theory (DFT) were performed on experimentally found structures, consisting of a C-phase core in two different orientations, and having Cu segregations in GP-like structures at their interfaces with the matrix.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Precipitation behavior in an Al–Cu–Mg–Si alloy during ageing

Газизов

Marioara

Friis

et al. 2019

Materials Science and Engineering: A

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“…Furthermore, the magnified SEM images represent the fragmented second phase in the CF specimen due to the higher shear stress formed during the forging process. According to the measurement of EDS attached to the SEM, the phase is rich in Al and Cu which is primarily metastable AlCu(θ', θ") and stable Al 2 Cu(θ) particles appearing as coherent and semi-coherent phases, respectively [32]. Dislocations are pinned by the dispersion of the secondary phase bringing an improving effect on the mechanical properties, especially at high temperature, for its thermal stability, nevertheless the second phase particles are widely believed to have adverse effects on the mechanical properties, due to their contribution to crack initiation, crack growth, and corrosion [33].…”

Section: Dynamic Mechanical Behaviormentioning

confidence: 99%

High Strain Rate Behavior of Ultrafine Grained AA2519 Processed via Multi Axial Cryogenic Forging

Azimi

Owolabi

Fallahdoost

et al. 2019

Metals

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The present work deals with studies on the dynamic behavior of ultrafine grained AA2519 alloy synthesized via cryogenic forging (CF) and room temperature forging (RTF) techniques. A split-Hopkinson pressure bar was used to perform high strain rate tests on the processed samples and the microstructures of the samples were characterized before and after impact tests. Electron backscatter diffraction (EBSD) maps demonstrated a significant grain size refinement from ~740 nm to ~250 nm as a result of cryogenic plastic deformation showing higher dislocation densities and stored strains in the CF sample when compared to the RTF sample. This microstructure modification caused the increase of dynamic flow stress in this alloy. In addition, the aluminum matrix of the CF alloy is more densely populated with fragmented particles than the RTF alloy due to the heavier plastic deformation applied to the cryogenically forged alloy. The results obtained from the stress–strain curve for the RTF sample showed intense thermomechanical instabilities in the RTF sample which led to a severe thermal softening and the subsequent sharp drop in the flow stress. However, no significant decrease was observed in the stress–strain curve of the CF alloys with ultrafine grains which means that thermal softening would probably not be the most effective failure mechanism. Furthermore, higher level of sensitivity of CF alloys to strain rates was observed which is ascribed to transition of rate-controlling plastic deformation mechanisms. In the post-mortem microstructure investigation, deformed and transformed adiabatic shear bands (ASBs) were identified on the RTF alloy when the strain rate is over 4000 s−1 at which it had experienced a significant thermal softening. On the other hand, circular path and aligned split arcs are the various shapes of the deformed ASB seen at no earlier than 4500 s−1 in the CF alloys. This is associated with the crack failure caused by grain boundary sliding.

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“…This difference was found to be either favorable or unfavorable to the mechanical performance of aluminum alloys due to the stronger or weaker strengthening effect of the dislocationinduced precipitates, respectively [5,6]. On the one hand, more nucleation sites at dislocations result in a greater density of stronger precipitates and finally increase the peak hardness in Al-Cu-Mg alloys [6][7][8]. On the other hand, for Al-Cu-Mg-Ag alloys, high density of deformationinduced dislocations increases the density of the θ′ phase but decreases the density of the effective strengthening Ω phase, which lead to loss in peak [2,5,9].…”

Section: Introductionmentioning

confidence: 99%

Improved Properties in Relation to Fine Precipitate Microstructures Tailored by Combinatorial Processes in an Al–Cu–Mg–Si Alloy

Niu

Chen

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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The 2xxx series Al alloys have been widely used in aerospace industry owing to their high strength, good plasticity and superior formability. To ensure a good control of shape, the quenched alloy sheets require a small pre-deformation before artificial aging. However, this pre-deformation considerably deteriorates the mechanical strength of the Al-3.0Cu-1.8Mg-0.5Si (wt%) alloys due to the formation of unfavorable large-sized precipitates at dislocations. To tackle this issue, we designed a pre-aging process prior to the pre-deformation. The thermal-mechanical treatment, involving pre-aging, pre-deformation and subsequent aging, markedly enhanced the ultimate tensile strength up to 521 MPa compared to that (448 MPa) of the alloy without pre-aging. Microstructure characterization revealed that the fine precipitates (~ 2 nm) with a uniform dispersion were promoted within the Al matrix, which in turn partly suppressed the formation of the unfavorable large-sized precipitate (~ 100 nm). Our findings provide a new clue for designing stronger Al alloys with age-hardenability.

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Effect of thermomechanical treatment on the microstructure, phase composition, and mechanical properties of Al–Cu–Mn–Mg–Zr alloy

Cited by 34 publications

References 31 publications

Precipitation behavior in an Al–Cu–Mg–Si alloy during ageing

Precipitation behavior in an Al–Cu–Mg–Si alloy during ageing

High Strain Rate Behavior of Ultrafine Grained AA2519 Processed via Multi Axial Cryogenic Forging

Improved Properties in Relation to Fine Precipitate Microstructures Tailored by Combinatorial Processes in an Al–Cu–Mg–Si Alloy

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