Microstructure and mechanical properties of Mg, Ag and Zn multi-microalloyed Al–(3.2–3.8)Cu–(1.0–1.4)Li alloys

Li, Jinfeng; Liu, Pingli; Chen, Yong-lai; Zhang, Xu-hu; Zheng, Zi Qiao

doi:10.1016/s1003-6326(15)63821-3

Cited by 62 publications

(18 citation statements)

References 14 publications

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“…Finely dispersed nanosized δ′ –Al 3 Li particles are visible in Figure a and θ ′ and T 1 (Al 2 CuLi) phases are in Figure b,c for the undeformed sample as indicated by the arrow and the circled area. Such microstructures are typical of decomposition in the Al–Li–Cu alloys, but it should be noted that increasing lithium content favors the formation of δ′ precipitates . Similar microstructures are also observed in the ARB‐processed samples: for the fine dispersions of nanosized δ′ –Al 3 Li particles as observed in Figure d,g and for the θ ′ phase and T 1 phase as in Figure f,i.…”

Section: Resultssupporting

confidence: 71%

Microstructures and the Mechanical Properties of the Al–Li–Cu Alloy Strengthened by the Combined Use of Accumulative Roll Bonding and Aging

et al. 2019

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In this study, the age-hardening behavior of severely-deformed and then artificially-aged A2099 Al-Li-Cu alloy has been investigated by Vickers hardness test, tensile test and transmission electron microscopy (TEM). The combined processing of accumulative roll bonding (ARB) and aging treatment at 373 K for 2419 ks resulted in the highest hardness (~190 HV) for the 5-cycled ARB sample with an age-hardenability of 37±2 HV. For the 2-cycled ARB sample with the aging treatment, the ultimate tensile strength and elongation to failure reached 553 MPa and 7%, which are greater than those of the ARB sample without aging treatment (i.e., 442 MPa and 1%). The corresponding TEM microstructures suggested that the refined '-Al 3 Li particles formed by spinodal decomposition are responsible not only for the higher hardness and strength but also for the optimized strength-ductility balance. Therefore, our proposed strategy; i.e. "take advantage of spinodal decomposition", is regarded as a convincing approach to induce nanosized precipitates within ultrafine grains for optimizing the strength-ductility balance.

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Section: Resultssupporting

confidence: 71%

Microstructures and the Mechanical Properties of the Al–Li–Cu Alloy Strengthened by the Combined Use of Accumulative Roll Bonding and Aging

et al. 2019

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“…The 2195 Al-Li alloy belongs to the third generation of Al-Li alloys. It has a high specific strength, low density, fatigue resistance, excellent low temperature performance, and corrosion resistance, which are widely used in the propellant tank of rockets and space shuttles [3,4,5]. By adjusting the ratio of Cu to Li in the alloy, a large number of finely dispersed T1(Al 2 CuLi) and θ’(Al 2 Cu) phases can be obtained, and the strength of the aluminum alloy can be improved [3].…”

Section: Introductionmentioning

confidence: 99%

Effects of Filler Wires on the Microstructure and Mechanical Properties of 2195-T6 Al-Li Alloy Spray Formed by TIG Welding

Zhang

Luo

et al. 2019

Materials

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The main purpose of this work was to investigate the microstructure and mechanical properties of spray-formed 2195-T6 Al-Li alloy welding joints produced by tungsten inert gas (TIG) with Al-Cu and Al-Si-Cu filler wires, so that they can be better used in space vehicle tanks. The porosity analysis indicates that the porosity area of the weld seam with the Al-Si-Cu filler wire is approximately 7.989 times larger than that of the Al-Cu filler wire. Furthermore, the microstructure and microhardness results indicate that the Al/Cu eutectic near the fusion line distributes more at the grain boundaries, while more dispersed Al2Cu phase is found inside the grain, which improves the strength of the joint when using Al-Cu filler wire. However, when using the Al-Si-Cu filler wire, more Si, Cu, and Ti elements are segregated at the grain boundaries, forming a brittle-hard network Al/Cu/Ti eutectic, which reduces the performance of the joint. Additionally, the tensile strength and elongation of the weld joint are about 68.6% and 89.9% of the base metal (BM) when using the Al-Cu filler wire, and can approach the level of friction stir welding (FSW). However, the tensile strength and elongation are only about 56.8% and 39.9%, respectively, of the BM in the weld joint when using the Al-Si-Cu filler wire. Lastly, the fractures both occur on the fusion line and the fracture morphology of the weld joint shows that it is a mixed fracture mode dominated by plastic fracture when using Al-Cu filler wire, while it is mainly a quasi-cleavage fracture mode when using Al-Si-Cu filler wire. Therefore, the joint strength when using Al-Si-Cu filler wire with high strength matching is not as good as that of Al-Cu filler wire with low strength matching.

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“…It can be observed that the tensile strength is comparable to similar material [18,31] but higher than several other types of Al-Li alloys [3,7,19,24,34] reported in the literature. It has been shown that increase in the Cu and Li contents of the alloy promotes the formation of strengthening precipitates such as Al2CuLi and Al2Cu phases which increase the alloy's strength [13,24,35]. Aging condition, homogenization heat treatment, orientation of testing and precipitate phases have been identified as vital factors which influence the alloy's tensile properties [5,18,21,22,31].…”

Section: Static Tensile Behaviormentioning

confidence: 99%

“…It is reported that elastic modulus of aluminum metal is increased by 6% while weight is decreased by 3% when it is alloyed with 1% lithium [3][4][5]. The simultaneous addition of copper and lithium improves the strength of the alloy [6]. However, challenges such as prohibitive cost, poor fatigue performance, low fracture toughness, poor corrosion resistance and high anisotropic behavior constrained the wide deployment of Al-Li in the aircraft industry [1,2,7,8].…”

mentioning

confidence: 99%

Analysis of the Fatigue Damage Behavior of AW2099-T83 Al-Li Alloy under Strain-Controlled Fatigue

Adinoyi¹,

Merah

Albinmousa

2019

Frattura Ed Integrità Strutturale

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Microstructural characteristics, monotonic and strain-controlled cyclic axial behaviors of AW2099-T83 Aluminum-Lithium alloy were investigated. Grain sizes and structures are not uniform in the different orientations studied. High strength and low ductility characterize the tensile behavior of the alloy under static loading. Strain-controlled fatigue testing was conducted at strain amplitudes ranging from 0.3% to 0.7%. Over this range, macro plastic deformation was only observed at 0.7%. Cyclic stress evolution was found to be dependent on both the applied strain amplitude and the number of cycles. Limited strain hardening was observed at low number of cycles, followed by softening, due probably to damage initiation. With low plastic strain, analytical approach was adopted to profile the damaging mechanism for the different applied strain amplitude. Because of the absence of fatigue ductility parameters due to low plasticity, a three-parameter equation was used to correlate fatigue life. Fractured specimens were studied under SEM to characterize the fracture surface and determine the controlling fracture mechanisms. The fractography analysis revealed that fracture at low strain amplitudes was shear controlled while multiple secondary cracks were observed at high strain amplitude. Intergranular failure was found to be the dominant crack propagation mode.

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Microstructure and mechanical properties of Mg, Ag and Zn multi-microalloyed Al–(3.2–3.8)Cu–(1.0–1.4)Li alloys

Cited by 62 publications

References 14 publications

Microstructures and the Mechanical Properties of the Al–Li–Cu Alloy Strengthened by the Combined Use of Accumulative Roll Bonding and Aging

Microstructures and the Mechanical Properties of the Al–Li–Cu Alloy Strengthened by the Combined Use of Accumulative Roll Bonding and Aging

Effects of Filler Wires on the Microstructure and Mechanical Properties of 2195-T6 Al-Li Alloy Spray Formed by TIG Welding

Analysis of the Fatigue Damage Behavior of AW2099-T83 Al-Li Alloy under Strain-Controlled Fatigue

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