Research on the effect of aging time on the microstructure of 7055 aluminum alloy

Li, Yuanyuan; Zhang, Ying; Han, Shuangfeng; Wang, Qing; Xiaoyu, Xiaoyu

doi:10.1016/j.vacuum.2019.108944

Cited by 14 publications

(4 citation statements)

References 10 publications

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“…Heat treatment was used to enhance the mechanical properties of the LMD Al 7050 alloy. Many studies have shown that heat treatment can affect the microstructure and mechanical properties of Al 7050 alloy [9][10][11]. Therefore, an appropriate heat treatment process is very important to enhance the microstructure and properties of this alloy.…”

Section: Experimental Materials and Methodsmentioning

confidence: 99%

Laser melting deposition of aluminium 7050 alloy: Heat treatment, microstructure and mechanical properties

Zhao

Deng

et al. 2022

Materials Science and Technology

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In this study, the microstructure and mechanical properties of laser melting deposited 7050 aluminium alloy are investigated. An anisotropic microstructure is observed in the alloy: the columnar-grained structure on the building plane and a fine equiaxial structure on the scanning plane. Pores are the main metallurgical defects found but a higher energy input can significantly reduce large pores. The mechanical properties can be significantly improved with heat treatment. After being subjected to multiple solution and aging treatments, the hardness, ultimate tensile strength and elongation at break of the printed alloy increase by 58.6%, 14.06% and 27.8%, respectively. This research offers a reference for the formation technique of large and complex 7xxx series aluminium alloy parts by additive manufacturing.

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Section: Experimental Materials and Methodsmentioning

confidence: 99%

Laser melting deposition of aluminium 7050 alloy: Heat treatment, microstructure and mechanical properties

Zhao

Deng

et al. 2022

Materials Science and Technology

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“…Figure 4 shows a significant coarsening phenomenon in the microstructure of the casting from the outer layer to the inner layer, with the average grain size increasing from 55 mm for the outer layer to 78 mm for the inner layer, and the average secondary dendrite arm spacing increasing from 15 mm for the outer layer to 21 mm. Li et al [19] used the vacuum centrifugal casting process to prepare 7,055 aluminum alloy cast pipe blanks and studied the microstructure and mechanical properties of the inner and outer layers of the alloy. The results show that the grain shape gradually transformed from fine equiaxed grains in the outer layer to coarse dendrites in the inner layer.…”

Section: Simulation and Analysis Of Microstructure Structurementioning

confidence: 99%

Microstructure and hot tearing sensitivity simulation and parameters optimization for the centrifugal casting of Al-Cu alloy

Lv,

Dou,

et al. 2023

Preprint

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A mathematical model of horizontal centrifugal casting was established, and numerical simulation analysis was conducted for the centrifugal casting process of cylindrical Al-Cu alloy castings to investigate the effect of the centrifugal casting process conditions on the microstructure and hot tearing sensitivity of alloy castings. Results show that increasing the centrifugal rotation and pouring speeds can refine the microstructure of the alloy but increasing the pouring and mold preheating temperatures can lead to an increase in grain size. The grain size gradually transitions from fine grain on the outer layer to coarse grain on the inner layer. Meanwhile, combined with the modified RDG hot tearing criterion, the overall distribution of the castings’ hot tearing sensitivity was analyzed. The analysis results indicate that the porosity in the middle region of the casting was large, and hot tearing defects were prone to occur. The hot tearing tendency on the inner side of the casting was greater than that on the outer side. The effects of centrifugal rotation speed, pouring temperature, and preheating temperature on the thermal sensitivity of Al-Cu alloy castings are summarized in this paper. This study revealed that the tendency of alloy hot cracking decreases with the increase of the centrifugal speed, and the maximum porosity of castings decreases first and then increases with the pouring temperature. As the preheating temperature increases, the overall maximum porosity of castings shows a decreasing trend.

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“…The shell in two-phase precipitates functions as a bridge between the matrix and the core [9][10][11]. The growth of the core results in the mismatch of the crystal lattice and the simultaneous loss of coherence [12]. The formation of the shell enables the maintenance of coherence and simultaneous core growth [11,13].…”

Section: Introductionmentioning

confidence: 99%

Effect of T6I6 tempering on the coherence between core/shell precipitates and a solid solution in the 2024 aluminium alloy

Stegliński,

Petrova,

Brodova

et al. 2024

Mater. Res. Express

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Heat treatment of materials, including, in particular, the two-stage T6I6 treatment, enables the nucleation of precipitates with a two-phase structure: core and shell. The above-mentioned treatment can be used to harden materials by selecting suitable treatment parameters and chemical composition of the material that initiate a selective diffusion of the alloying elements. In this paper, tests of the T6I6 treatment were carried out on the EN AW-2024 alloy. The aluminium alloy was subject to T6I6 treatment and then the element distribution map was examined within the precipitate using the EDS method, mechanical properties of the precipitate were tested using the nanoindentation method and the kinetics of formation of the precipitate was analysed using DSC. The impact of two-phase precipitates on the mechanical properties has been determined through a static strength test, whereas the impact of the structure on the above-mentioned mechanical properties was determined based on HR-TEM observations. The results of the study confirm the formation of a precipitate with a two-phase structure (shell; core) in the EN AW-2024 alloy as well as the kinetics of their formation as a function of the parameters of the T6I6 process, such as temperature, duration and cooling rate. Strength tests have confirmed an increase in strength of the alloy to Rm = 520 MPa, with elongation remaining the same at A = 13.2%. HR-TEM observations, in turn, prove that the shell forming on the core is coherent with solid solution α, which means that the hardening of the alloy may occur as a sum of the Mott-Nabarro, Friedel and Ashby-Orowan mechanisms.

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Research on the effect of aging time on the microstructure of 7055 aluminum alloy

Cited by 14 publications

References 10 publications

Laser melting deposition of aluminium 7050 alloy: Heat treatment, microstructure and mechanical properties

Laser melting deposition of aluminium 7050 alloy: Heat treatment, microstructure and mechanical properties

Microstructure and hot tearing sensitivity simulation and parameters optimization for the centrifugal casting of Al-Cu alloy

Effect of T6I6 tempering on the coherence between core/shell precipitates and a solid solution in the 2024 aluminium alloy

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