An improved thermo-mechanical treatment of high-strength Al–Zn–Mg–Cu alloy for effective grain refinement and ductility modification

Huo, Wangtu; Shi, Jun; Hou, Longgang; Zhang, J.S.

doi:10.1016/j.jmatprotec.2016.08.027

Cited by 87 publications

(20 citation statements)

References 29 publications

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“…A gradual decay of the precipitation-free zone is caused by plastic deformation, resulting in concentration of dislocations being privileged areas for the precipitation of strengthening η-MgZn 2 phase. Obtained results are convergent with those presented by Cai et al [18] and Huo et al [19].…”

Section: Microstructuresupporting

confidence: 91%

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Microstructural and Fractographic Analysis of Plastically Deformed Al-Zn-Mg Alloy Subjected to Combined High-Cycle Bending-Torsion Fatigue

Kowalski

Ozgowicz

Jurczak

et al. 2018

Metals

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Abstract:The present manuscript aims to determine the effect of various deformation levels during low-temperature thermo-mechanical treatment (LTTT) on the microstructure and fatigue strength of Zr-microalloyed Al-Zn-Mg alloy. The fatigue strength of the alloy was studied in high-cycle bending-torsion tests. The determination of the influence of plastic deformation level during LTTT on the microstructure was based on transmission electron microscopy (TEM) observations. The analysis of fracture after the fatigue tests was performed based on fractographic images using scanning electron microscopy (SEM). It was found that the major factor affecting the microstructure of the alloy, and determining the nature of fatigue fracture, is the strain level applied during LTTT.

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Section: Microstructuresupporting

confidence: 91%

“…This has also been confirmed earlier by Kowalski et al [17]. [19]. A microstructure of the alloy subjected to LTTT with 30% reduction is characterized by a high density of dislocations inside the α matrix subgrains (Figure 5a).…”

Section: Microstructuresupporting

confidence: 87%

Microstructural and Fractographic Analysis of Plastically Deformed Al-Zn-Mg Alloy Subjected to Combined High-Cycle Bending-Torsion Fatigue

Kowalski

Ozgowicz

Jurczak

et al. 2018

Metals

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show abstract

“…The toughness of a material is closely related to the ratio of large-angle grain boundaries in the microstructure. [15][16][17] The difference in the orientation angle of adjacent grain boundaries can determine the extension path of the microcracks in the material. When the microcrack extension encounters a large-angle grain boundary, it will deflect and hinder its rapid propagation, thus improving the crack propagation energy of the material.…”

Section: Misorientation and Misorientation Angle Distributionsmentioning

confidence: 99%

Microstructure evolution and fracture analysis of hot-rolled explosive-welded 06Cr13/Q345R composites

Li¹,

Zhao²,

Li³

et al. 2019

Mater. Tehnol.

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In this paper, with electron backscatter diffraction (EBSD) and SEM, the microstructure evolution and fractography of bonded interfaces were analyzed at various reduction rates (0, 15, 30, 40, 50 and 60) %. A 06Cr13/Q345R explosive-welded composite interface of 50-80 μm was the impact area of explosive cladding where the grains of 06Cr13 and Q345R were both low-sized and uniform. Subsequent to hot rolling, the explosive-welding effect on the 06Cr13-side interface was rapidly weakened. Compared to the 06Cr13-steel side, the explosive-cladding effect on the Q345R-side interface was slowly weakened. A continuous orientation distribution occurred, which indicated that a continuous, dynamic recrystallization mechanism existed in the explosive-welded composite plate. In contrast, the dominant recrystallization-deformation mechanism was the discontinuous, dynamic recrystallization, taking place under the rolling deformation. Two peaks existed between the 30-% reduction rate and the 60-% reduction rate, and they were apparently at positions <15°and 50°-60°. As the rolling reduction rate increased, the two materials were significantly bonded together and the interface diffusion distances of the peaks and valleys decreased and tended to be homologous, whereas the composite interface fault was increasingly less apparent.

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“…Although the 7075 aluminum alloy has high mechanical strength, its low toughness and stress-corrosion susceptibility might be a problem for some applications. Therefore, new thermomechanical cycles have been developed to overcome these difficulties 1,2 .…”

Section: Introductionmentioning

confidence: 99%

Softening Behavior During Annealing of Overaged and Cold-rolled Aluminum Alloy 7075

2019

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This work proposes studying the softening kinetics of aluminum alloy 7075-T6. Firstly, AA 7075 strips were overaged (300°C and 5 hours). Then, the overaged strips were cold-rolled at room temperature (45% in thickness reduction) and, after that, annealed at different temperatures (200°C and 250°C) and time intervals (30 minutes-4 hours). By using polarized light microscopy, EBSD and Vickers hardness measurements, the softening mechanisms were determined and proper mathematical models (Kuhlmann, Johnson-Mehl-Avrami-Kolmogorov and Austin-Rickett) were used to analyse the experimental data. The results show that although almost all observed softening can be attributed to recovery, the phenomena is well described by using mathematical models for phase transformations (JMAK and Austin Riccket). In order to promote recrystallization of overaged AA 7075, an additional thickness reduction (75%) were used. These samples were annealed isocronically during 1 hour (100-400°C) and it was found that recrystallization only took place at 400°C.

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An improved thermo-mechanical treatment of high-strength Al–Zn–Mg–Cu alloy for effective grain refinement and ductility modification

Cited by 87 publications

References 29 publications

Microstructural and Fractographic Analysis of Plastically Deformed Al-Zn-Mg Alloy Subjected to Combined High-Cycle Bending-Torsion Fatigue

Microstructural and Fractographic Analysis of Plastically Deformed Al-Zn-Mg Alloy Subjected to Combined High-Cycle Bending-Torsion Fatigue

Microstructure evolution and fracture analysis of hot-rolled explosive-welded 06Cr13/Q345R composites

Softening Behavior During Annealing of Overaged and Cold-rolled Aluminum Alloy 7075

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