Effect of two-step aging on the mechanical properties of AA2219 DC cast alloy

Elgallad, E. M.; Zhang, Z.; Chen, X.-G.

doi:10.1016/j.msea.2014.12.002

Cited by 68 publications

(21 citation statements)

References 20 publications

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“…And Figure 7b shows an endothermic peak V and an exothermic peak M in each curve. The endothermic peak V represented the dissolution of the θ" phase [27] and was largest for sample C. The exothermic peak M of sample C was the largest as well. These results indicated that TiC nanoparticle content of 0.9 wt.% effectively promoted the precipitation of θ" and θ phases.…”

Section: Microstructurementioning

confidence: 93%

Effect of Nanoparticle Content on the Microstructural and Mechanical Properties of Forged and Heat-Treated TiC/2219 Nanocomposites

Yang

Jiang

et al. 2019

Metals

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In this study, castings of TiC nanoparticle reinforced 2219 aluminum matrix composites with different TiC nanoparticle contents (0, 0.5, 0.9, 1.3, and 1.7 wt.%) prepared using an ultrasound-assisted stirring technology were deformed by multidirectional forging at 510 °C followed by T6 aging treatment. The microstructural evolution and mechanical properties of the 2219 alloy and its composites were investigated and compared. Optical microscopy and scanning electron microscopy revealed that the composite with 0.9 wt.% TiC nanoparticle content possessed finer grains and the lowest amount of Al2Cu phases. The electron backscattered diffraction (EBSD) was used to characterize the sub-grains. The precipitation microstructures of the 2219 alloy and composites with different nanoparticle contents were characterized by differential scanning calorimetry and transmission electron microscopy. It was found that 0.9 wt.% TiC/2219 nanocomposites contained the highest amount of θ″ and θ′ phases with shorter lengths. This might imply that the nanoparticles uniformly dispersed in the matrix could facilitate the precipitation of θ″ and θ′ phases during aging. Thus, the 0.9 wt.% TiC/2219 nanocomposite showed the best mechanical properties. The ultimate tensile strength, yield strength, and elongation of the 0.9 wt.% TiC/2219 nanocomposite increased by 24.2, 46.1, and 37.2%, respectively, compared to those of the 2219 alloy.

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Section: Microstructurementioning

confidence: 93%

Effect of Nanoparticle Content on the Microstructural and Mechanical Properties of Forged and Heat-Treated TiC/2219 Nanocomposites

Yang

Jiang

et al. 2019

Metals

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“…A higher stress is required for dislocation cutting through a coherent precipitates than required to loop around incoherent second phase particles [30]. The high strength and hardness of peakaged AA 2219 alloy has been attributed to a mixture of coherent  and semi-coherent  precipitates [25]. The T8 temper designation of the investigated AA 2219 alloy indicates that the alloy was cold worked after solution heat treatment and prior to age hardening.…”

Section: Dynamic Impact Responsementioning

confidence: 97%

Shear strain localization in AA 2219-T8 aluminum alloy at high strain rates

Owolabi¹,

Bolling²,

Tiamiyu³

et al. 2016

Materials Science and Engineering: A

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AA 2219 aluminum alloy is characterised by high temperature strength, good weldability and excellent suitability as choice material for several components in defense and aerospace structures. In this paper, the dynamic impact response of cylindrical specimens of AA 2219-T8 alloy was investigated using the split Hopkinson pressure bar while strain evolution during the dynamic deformation was monitored in-situ using digital image correlation (DIC) technique. The results of DIC analysis and microstructural evaluation of the impacted specimens indicated occurrence of heterogeneous deformation characterised by intense shear strain localisation. The strain localisation became noticeable after 80 s from the start of deformation. Both transformed and deformed shear bands developed in the specimens and they cracked along the transformed bands at high strain rates. Microstructural analysis of the as-received alloy suggested that it consists of two type of dispersed second phase particles: coarse particles which are 10-45 m in size and fine precipitates of sizes less than 1 m. Intense adiabatic heating and strain localization led to the dissolution of the coarse second phase particles inside the transformed bands while the fine second phase particles survived the heat. The dynamic mechanical response of the alloy and its tendency to form adiabatic shear bands are influenced by the length to diameter ratio of the cylindrical test specimens.

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“…AA2219 is a heat-treatable material based on aluminum-copper system with metastable AlCu(θ', θ") as the major strengthening second phase (Elgallad, Zhang, & Chen, 2015). High strength-to-weight ratio, excellent weldability, machinability and superior cryogenic properties lead to the alloy being increasingly used as an engineering material in the aircraft and the automotive sectors as a structural material (Asm, 1990;Owolabi et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

AA2219 Aluminum Alloy Processed via Multi-Axial Forging in Cryogenic and Ambient Environments

Azimi¹,

Owolabi²,

Fallahdoost³

et al. 2019

JMSR

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This paper presents the microstructure and the mechanical behavior of nanocrystalline AA2219 processed by multi axial forging (MAF) at ambient and cryogenic temperatures. The X-ray diffraction pattern and transmission electron microscopy micrographs in the initial microstructure characterization indicate a more effective severe plastic deformation during the cryogenic MAF than the same process conducted at room temperature. MAF at cryogenic temperature results in crystallite size reduction to nanoscales as well as second phase particles breakage to finer particles which are the crucial factors to increasing the mechanical properties of the material. Fractography analysis and tensile tests results show that cryogenic forging does not only increase the mechanical strength and toughness of the alloys significantly, but also improves the ductility of the material in comparison with the conventional forging. In this comparative regard, cryogenic processing provides 44% increase in the tensile strength of the material only after 2 forging cycles when compared to the room temperature process. In addition, further forging process to the next cycles slightly enhances the tensile strength at the expense of ductility due to less ability of the dislocations to accumulate. However, the ductility of the ambient temperature forged samples decreases at a faster rate than that of cryoforged samples.

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Effect of two-step aging on the mechanical properties of AA2219 DC cast alloy

Cited by 68 publications

References 20 publications

Effect of Nanoparticle Content on the Microstructural and Mechanical Properties of Forged and Heat-Treated TiC/2219 Nanocomposites

Effect of Nanoparticle Content on the Microstructural and Mechanical Properties of Forged and Heat-Treated TiC/2219 Nanocomposites

Shear strain localization in AA 2219-T8 aluminum alloy at high strain rates

AA2219 Aluminum Alloy Processed via Multi-Axial Forging in Cryogenic and Ambient Environments

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