Properties of AA7075 aluminum alloy in aging and retrogression and reaging process

Özer, Gökhan; Karaaslan, Ahmet

doi:10.1016/s1003-6326(17)60261-9

Cited by 85 publications

(52 citation statements)

References 25 publications

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“…The sample was under aged after 1 h holding, and a large number of nano η' hardening phases were precipitated in the matrix. η' phase was the main strengthening phase of the under aged samples, which was coherent with the matrix, and had an orientation relationship of (001)η′∥{111}Al; [11][12][13][14][15][16][17][18][19][20]η′∥<111>Al; (10-10)η′∥{110}Al [19,20]. There exists different viewpoints of the formation and evolution of η' phase.…”

Section: Microstructure Investigationmentioning

confidence: 99%

“…However, its low formability requires multi-step forming processes with intermediate heat treatments. Previous research on 7000 series aluminum were based on its application in the aerospace field, comprising the influence of homogenization treatment on crystallization phases [9,10] and the precipitation behavior of hardening phases, as well as its influence on properties during artificial aging (AA) treatment [11,12] and multistage artificial aging treatment (RRA) [13,14]. It was found that the maximum aging strength was achieved under 120 • C/24 h or 180 • C/12 h, which is not suitable for production of auto sheet.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Preaging Treatment on Bake-Hardening Response and Electrochemical Corrosion Behavior of High Strength Al-Zn-Mg-Cu-Zr Alloy

Liu

Wang

2019

Metals

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The influence of preaging (PA) treatments on the bake hardening (BH) response of a AlZnMgCuZr aluminum alloy which served as automotive body structures were studied in this paper. A novel two-step PA treatment was particularly designed and further employed. The mechanical properties of the alloy were tested in detail. The microstructure was characterized by optical microscope (OM), transmission electron microscopy (TEM) and 3D measuring laser microscope (3D–MLM). Meanwhile, the corrosion behavior was investigated by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. The results indicated that the PA treatment was beneficial for the improvement of BH response after baking at 180 °C immediately after the solution treatment and the micro-hardness reached the peak value (194 HV) after 10 h holding, which had a percentage improvement of 110.87% compared to the hardness under the solution condition. The PA treatments decreased natural aging (NA) adverse effects, while it had the lowest NA effect and optimal BH response under 120 °C/20 min. Such a novel two-step PA treatment was revealed further to decrease the NA effect and increase the BH response compared to the optimal PA treatment, in particular, the BH value could reach 168 MPa and was 21.7% higher than that of optimal PA + NA treatment. The optimal corrosion resistance has been shown up by the combined characterizations of potentiodynamic polarization curves, EIS Nyquist plots, and 3D–MLM images.

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Section: Microstructure Investigationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Preaging Treatment on Bake-Hardening Response and Electrochemical Corrosion Behavior of High Strength Al-Zn-Mg-Cu-Zr Alloy

Liu

Wang

2019

Metals

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“…Then, it realized metallurgical bonding. Retrogression and reaging (RRA) treatment was commonly employed to improve microstructure, mechanical properties [12][13][14], resistance to stress corrosion cracking [15][16][17], and resistance to fatigue crack propagation [18][19][20] of 7XXX series aluminum alloy.…”

Section: Introductionmentioning

confidence: 99%

Influence of Retrogression and Reaging Treatment on Microstructure and Microhardness of the 3A21/7075 Aluminum Alloy Cladding Material

Ren

Sun

et al. 2021

International Journal of Photoenergy

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The 7075 aluminum alloy was an important structural material in the field of aeronautics and astronautics. With the development of this field, the requirements for its comprehensive properties were increasing. A novel casting method, the impact jet solid-liquid compound casting, was adopted to fabricate the 3A21/7075 aluminum alloy cladding material. Retrogression and reaging (RRA) treatment was further applied to the 3A21/7075 aluminum alloy cladding material in order to investigate the influence of RRA on microstructure and microhardness of the 3A21/7075 aluminum alloy cladding material. Then, the electron backscattered diffraction (EBSD) technique and the transmission electron microscope (TEM) together with the energy dispersive spectrometer (EDS) and the hardness test were utilized to analyze the influence of RRA treatment on microstructure and hardness of the 3A21/7075 aluminum alloy cladding material. The research results showed the 3A21/7075 aluminum alloy cladding material had better deformability. The amount of fine and dispersed phases precipitated in grains was in favor of improving the comprehensive mechanical properties of the 3A21/7075 aluminum alloy cladding material. This research might provide data and a theoretical approach for the engineering application of the 3A21/7075 aluminum alloy cladding material.

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“…With a special heat treatment, called as retrogression and re-aging, both the corrosion resistance and the mechanical strength of the alloy are provided [10]. As a result of the retrogression and reaging, the size, distribution and chemical composition of the grain and grain boundary precipitates of the alloy change, resulting in changes in the mechanical properties of the material [11].…”

Section: Introductionmentioning

confidence: 99%

The effect of retrogression and re‐aging treatment on mechanical and tribological features of AA7075 aluminium alloy

Özer

Gecü

Karaaslan

2019

Materialwissenschaft Werkst

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In this study, T651‐applied AA7075 alloy was subjected to retrogression and re‐aging (RRA) process. Various retrogression temperatures (180 °C, 280 °C, 370 °C) and times (15 min, 30 min, 90 min) were used to determine the effects of temperature and time on the mechanical and tribological properties of the AA7075 alloy. All re‐aging stages were performed at 120 °C for 24 hours. Retrogression and re‐aging‐applied specimens were characterized by scanning electron microscope, transmission electron microscope, x‐ray diffraction, Charpy V‐notch impact and tensile tests. Brinell hardness measurements and ball‐on‐disc type tribometer measurements by using AISI 316 ball as a counterpart have also been conducted. Grain boundary precipitates in the T651‐applied specimen was transformed from continuous to the discontinuous structure after retrogression and re‐aging process. Continuous MgZn2 precipitates at grain boundaries were disintegrated and re‐precipitated along the grain boundaries. The sizes of intragranular precipitates have become coarsened by comparison with the T651 condition. Hardness, tensile strength and wear resistance were decreased whereas impact toughness values were increased with increasing retrogression temperature and time. The best wear resistance was obtained in the sample treated at 180 °C for 15 minutes.

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Properties of AA7075 aluminum alloy in aging and retrogression and reaging process

Cited by 85 publications

References 25 publications

Influence of Preaging Treatment on Bake-Hardening Response and Electrochemical Corrosion Behavior of High Strength Al-Zn-Mg-Cu-Zr Alloy

Influence of Preaging Treatment on Bake-Hardening Response and Electrochemical Corrosion Behavior of High Strength Al-Zn-Mg-Cu-Zr Alloy

Influence of Retrogression and Reaging Treatment on Microstructure and Microhardness of the 3A21/7075 Aluminum Alloy Cladding Material

The effect of retrogression and re‐aging treatment on mechanical and tribological features of AA7075 aluminium alloy

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