Morphologies, orientation relationships, and evolution of the T-phase in an Al-Cu-Mg-Mn alloy during homogenisation

Chen, Y.Q.; Pan, Suping; Liu, W.H.; Liu, Xingcheng; Tang, Changping

doi:10.1016/j.jallcom.2017.03.161

Cited by 60 publications

(15 citation statements)

References 28 publications

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“…The corresponding solute EDS mappings of Cu, Mg, Mn, and Al in Figure 1d show that the dispersoid and intermetallic phases on grain boundaries and within the grain interiors contain Al, Cu, and Mn. Comparison of these observations with previous work indicates the standard T-Al 20 Cu 2 Mn 3 phase, which has an orthorhombic structure with lattice parameters of a = 2.42 nm, b = 1.25 nm, c = 0.775 nm [9,17,18]; whilst the other is the Al 7 Cu 2 (Fe, Mn) phase, which has a tetragonal structure of P4/mnc and lattice parameters of a = 0.6336 nm, c = 1.487 nm [5]. Figure 1e presents the cross-section of one Cu-and Mn-containing, rod-like precipitate in the Al matrix.…”

Section: Resultssupporting

confidence: 72%

“…The corresponding fast Fourier transform (FFT) pattern of the precipitate is shown in Figure 1f. This phase is the Al 20 Cu 2 Mn 3 phase, which contains two sets of interfaces parallel to two low index planes of the T-phase, namely {200} T and {101} T [18]. The Al 20 Cu 2 Mn 3 phase is a dispersoid phase that cannot be dissolved by heat treatments; in conventional thermomechanical processing of Al-Cu type alloys, it acts to limit grain growth [9].…”

Section: Resultsmentioning

confidence: 99%

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Microstructures and Hardness Prediction of an Ultrafine-Grained Al-2024 Alloy

Chen

Tang

Zhang

et al. 2019

Metals

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High-pressure torsion (HPT) is a high efficiency processing method for fabricating bulk ultrafine-grained metallic materials. This work investigates microstructures and evaluates the corresponding strengthening components in the center of HPT disks, where effective shear strains are very low. An Al-4.63Cu-1.51Mg (wt. %) alloy was processed by HPT for 5 rotations. Non-equilibrium grain and sub-grain boundaries were observed using scanning transmission electron microscopy in the center area of HPT disks. Solute co-cluster segregation at grain boundaries was found by energy dispersive spectrometry. Quantitative analysis of X-ray diffraction patterns showed that the average microstrain, crystalline size, and dislocation density were (1.32 ± 0.07) × 10−3, 61.9 ± 1.4 nm, and (2.58 ± 0.07) × 1014 m−2, respectively. The ultra-high average hardness increment was predicted on multiple mechanisms due to ultra-high dislocation densities, grain refinement, and co-cluster–defect complexes.

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Section: Resultssupporting

confidence: 72%

Section: Resultsmentioning

confidence: 99%

Microstructures and Hardness Prediction of an Ultrafine-Grained Al-2024 Alloy

Chen

Tang

Zhang

et al. 2019

Metals

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“…Moreover, unlike Cu, Mg, Zn, Zr and Fe, the distribution of Mn atoms in the grain was not uniform in Figure 5e. According to previous work, the toughness phase, T (Al20Cu2Mn3) phase [22], might formed in grains and promoted the solute free zone along the grain boundary in darker color shown in Figure 5e. Further analysis of elements distribution after homogenization was detected in Figure 5.…”

Section: Segregation Evolutionmentioning

confidence: 62%

Investigation on Microstructural Evolution and Properties of an Al-Cu-Li Alloy with Mg and Zn Microalloying during Homogenization

Wang

et al. 2018

Metals

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The microstructural evolution and properties of an Al-Cu-Li alloy with Mg and Zn microalloying (Al-3.5Cu-1.5Li-0.5Mg-0.4Zn-0.3Mn-0.12Zr-0.06Ti) ingot subjected to homogenization (second-step annealing at 500 °C for 24 h following first-step annealing at 400 °C for 8 h) were investigated. Mg-Zn atom clusters were enriched at the end of dendrites as well as low-melting eutectic phases such as S (Al2CuMg), T2 (Al6CuLi3), TB (Al7.5Cu4Li) and T1 (Al2CuLi) in the as-cast alloy. During homogenization, Mg-Zn atom clusters diffused from the segregation to the vacancies, leading to the dissolution of the low-melting eutectic phases. Not only Al3Zr particles were observed at 500 °C, but more fine and uniform spherical dispersoids appeared, which were assumed as Al3(ZrxTiyLi1−x−y). Mg and Zn microalloying can promoted the nucleation of Al3Zr and Al3(ZrxTiyLi1−x−y) dispersoids, as well as T (Al20Cu2Mn3) phases, which all inhibited recrystallization effectively and improve the uniformity of the grains due to the strong pinning effect. The yield ratio was decreased from 0.81 to 0.52 with the yield strength decreased from 172 MPa to 61 MPa, which showed better plastic deformation ability of the alloy subjected to homogenization. In addition, the dissolution of low-melting eutectic phases and formation of Al3(ZrxTiyLi1−x−y) dispersoids resulted in the significant improvement on thermal stability.

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“…Particularly, with the demand and development of rapid transportation vehicles, the security evaluation of aluminium alloy under fatigue loading is becoming more important. 3,4 The service environment is a key factor influencing the fatigue behaviour of Al alloy. It is previously reported that even a slight environmental change would result in a significant change in the fatigue behaviour of Al alloy.…”

Section: Introductionmentioning

confidence: 99%

The fatigue crack growth behaviour of 2524‐T3 aluminium alloy in an Al₂O₃ particle environment

Chen

Tang

Pan

et al. 2020

Fatigue Fract Eng Mat Struct

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The effect of the Al2O3 dust environment on the crack propagation behaviour of 2524‐T3 Al alloy was investigated. The results show that the Al2O3 dust environment reduces the fatigue crack growth rate (FCGR) of alloy especially at low ΔK. Many Al2O3 particles are deposited and stuck in the crack during fatigue loading which promotes crack closure, while this effect is gradually weakened with the increase of ΔK. The deposited Al2O3 particles induce the disorderly arranged slip bands (SBs) ahead of the crack tip which deflects the crack path making it more tortuous in the Al2O3 dust.

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Morphologies, orientation relationships, and evolution of the T-phase in an Al-Cu-Mg-Mn alloy during homogenisation

Cited by 60 publications

References 28 publications

Microstructures and Hardness Prediction of an Ultrafine-Grained Al-2024 Alloy

Microstructures and Hardness Prediction of an Ultrafine-Grained Al-2024 Alloy

Investigation on Microstructural Evolution and Properties of an Al-Cu-Li Alloy with Mg and Zn Microalloying during Homogenization

The fatigue crack growth behaviour of 2524‐T3 aluminium alloy in an Al₂O₃ particle environment

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Morphologies, orientation relationships, and evolution of the T-phase in an Al-Cu-Mg-Mn alloy during homogenisation

Cited by 60 publications

References 28 publications

Microstructures and Hardness Prediction of an Ultrafine-Grained Al-2024 Alloy

Microstructures and Hardness Prediction of an Ultrafine-Grained Al-2024 Alloy

Investigation on Microstructural Evolution and Properties of an Al-Cu-Li Alloy with Mg and Zn Microalloying during Homogenization

The fatigue crack growth behaviour of 2524‐T3 aluminium alloy in an Al2O3 particle environment

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The fatigue crack growth behaviour of 2524‐T3 aluminium alloy in an Al₂O₃ particle environment