Comparisons of Age Hardening and Precipitation Behavior in 7075 Alloy Under Single and Double-Stage Aging Treatments

Fan, Yun; Tang, Xuan; Wang, Shaohan; Chen, Bin

doi:10.1007/s12540-020-00875-7

Cited by 22 publications

(12 citation statements)

References 21 publications

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“…Analysis of the developed RSM model. The equation (3) shows an empirical relationship between Vickers hardness and factors that were developed using RSM…”

Section: Resultsmentioning

confidence: 99%

“…2 Optimum Vickers micro-hardness was achieved 166HV with optimum value of the parameter A (145°C), B (4.5 weeks), and C (166°C). The 1.2% error was obtained between the experimental value and predicted value using RSM model 3. The RSM analysis indicates that the Vickers microhardness is mostly affected by the linear factor (C) post-artificial aging temperature (with 45% contribution) as compared to factor (A) pre-artificial aging temperature and factor (B) natural aging time.…”

mentioning

confidence: 89%

“…The demand of lighter materials is increasing significantly day by day in the aircraft and automobile industries. It has been investigated [1][2][3] that by 10% reduction in a car mass, the petrol consumption and CO 2 emission can be decreased by 6%-8% and 4%-6%, respectively. The weight of vehicle can be made lighter by using aluminum alloy, magnesium alloys, titanium alloys, and ultra-high strength steels.…”

Section: Introductionmentioning

confidence: 99%

“…Authors also found improvement of 20% and 17% in coefficient of thermal expansion and thermal conductivity, respectively, as compared to as received material. Fan et al 3 compared the mechanical properties of 7075 alloy with single and double stage aging treatment. They reported that the hardness value for the single stage was 184 HV and for double stage it was 182 HV but single stage aging treatment took 30 hours and double stage aging treatment took only 190 minutes.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Optimization of precipitate hardening parameters of 7075 aluminum alloy using response surface methodology

Yadav¹,

Padap²

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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In the present research work, combination of artificial aging (pre and post) and natural aging was performed on 7075 Al alloy. Aging parameters were optimized using response surface methodology model to get the maximum value of Vickers micro-hardness, hardness value, and tensile strength. Three factors with five levels each were used to develop the center composite rotatable design (CCRD-approach). The three factors were pre-artificial aging temperature, natural aging time, and post-artificial aging temperature. The contour plots, surface plots, and mean effects plots were drawn to study the effect of individual factors and interactions of the factors on micro hardness. The coefficient of the regression R2 was 0.9962 which shows the excellent accuracy of the developed model. One hundred and fifty-one percent increment in the micro hardness and 115% increment in the value of the ultimate tensile strength were observed in optimized sample compared to annealed sample. The Vickers micro-hardness, optical microstructural, tensile test, X-ray diffraction analysis, energy dispersive X-ray spectroscopy analysis, and fractography using scanning electron microscopy of fractured tensile specimen were conducted in this research work.

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“…Analysis of the developed RSM model. The equation (3) shows an empirical relationship between Vickers hardness and factors that were developed using RSM…”

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Optimization of precipitate hardening parameters of 7075 aluminum alloy using response surface methodology

Yadav¹,

Padap²

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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show abstract

“…In the study by Y. Fan et al [15] in which the effects of single and two-stage aging processes applied to Al 7075 alloy on age hardening and precipitation behavior were compared, it was reported that the hardness was 184 HV after single aging, 182 HV after double aging, and mechanical properties gave similar results. In a study by Cai, SW et al [16] investigating the effects of single and double aging heat treatment applied to Al 7075 alloy on strength, in double aging heat treatment the hardness of the alloy is double peak and the strengthening stage of the first peak aging state is mainly high density GP regions.…”

Section: Introductionmentioning

confidence: 95%

Enhancement of impact toughness properties of Al 7075 alloy via double aging heat treatment

Altuntaş

2022

Gazi Üniversitesi Fen Bilimleri Dergisi Part C: Tasarım Ve Teknoloji

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In this study, Charpy impact test specimens were prepared by cutting Al 7075 alloy according to ASTM-E23 standards. The prepared test specimens were dissolved in a single-phase region for 1 hour at 480°C in vacuum atmosphere and artificially aged at 120°C for 24 hours after quenching. After the first step aging heat treatment applied, the specimens were artificially aged for 5-50 hours at 180°C for the second time. Microstructural characterization and fracture surface analyzes of the specimens were determined using SEM (Scanning Electron Microscope) device, crystallographic analysis of the precipitated phases were determined using XRD (X-ray diffraction) device. The increase in the amount of ƞı phase (MgZn2) with increasing double aging heat treatment time was effective in increasing the strength. After 10 hours of double aging heat treatment, the impact toughness value is improved by 300% compared to the single aged condition.

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Analysis of the Ce(III) chloride, Ce(III) nitrate, and Ce(III) propionate as corrosion inhibitor of the aluminum alloys in NaCl solution

Radojković

Marunkić

Milošević

et al. 2022

Materials & Corrosion

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Green corrosion inhibitors, Ce(III) chloride, Ce(III) nitrate, and Ce(III) propionate, were tested in NaCl solution with the aim to evaluate their inhibitory effect on 7049 aluminum alloy and to propose a mechanism of their inhibitive action. Corrosion properties of the formed inhibitor layer were analyzed using electrochemical impedance spectroscopy, while the pit formation resistance was analyzed using potentiodynamic polarization tests. Morphology of the formed pits was evaluated by scanning electron microscope/energy‐dispersive spectroscopy analysis. It was shown that Ce(III) propionate in NaCl solution has a noticeably higher protective ability than Ce(III) chloride and Ce(III) nitrate. The presence of cerium, propionate anions, and Al–O bonds in the inhibitive layer on the 7049 aluminum alloy surface was confirmed by X‐ray photoelectron spectroscopy analysis. This indicates the formation of Ce propionate complexes and bonds via oxygen atoms from carboxylate anions with the metal surface. Density‐functional theory methods were used for the geometry optimization of possible Ce propionate complexes as corrosion inhibitors.

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Comparisons of Age Hardening and Precipitation Behavior in 7075 Alloy Under Single and Double-Stage Aging Treatments

Cited by 22 publications

References 21 publications

Optimization of precipitate hardening parameters of 7075 aluminum alloy using response surface methodology

Optimization of precipitate hardening parameters of 7075 aluminum alloy using response surface methodology

Enhancement of impact toughness properties of Al 7075 alloy via double aging heat treatment

Analysis of the Ce(III) chloride, Ce(III) nitrate, and Ce(III) propionate as corrosion inhibitor of the aluminum alloys in NaCl solution

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