Effects of time and temperature on the creep forming of 7075 aluminum alloy: Springback and mechanical properties

Jeshvaghani, R. Arabi; Emami, M.; Shahverdi, Hamid Reza; Hadavi, S.M.M.

doi:10.1016/j.msea.2011.08.025

Cited by 51 publications

(19 citation statements)

References 16 publications

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“…It's shown in works [13,14] that panel formation in the creep regime is limited by deformation and shows a large value of material spring-back. To account the spring-back and to obtain the required curvature of the panel it is proposed to use multi-point forming (MPF) in the creep regime [15].…”

Section: Introductionmentioning

confidence: 99%

Simulation and estimation of parameters in reconfigurable multipoint forming processes of plates in the creep mode

2017

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Abstract. Mathematical models and numerical methods for the optimal solution of inverse forming problems monolithic panels with contact stamp devices have been developed. Using the minimization criterion for damage in functionals of inverse problems, the optimal laws of deformation in creep are found. The algorithms implemented in MSC.Marc allow to model and evaluate the parameters of the technological processes for the manufacture of parts, in particular reconfigurable multi-point form-creation.

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Section: Introductionmentioning

confidence: 99%

Simulation and estimation of parameters in reconfigurable multipoint forming processes of plates in the creep mode

2017

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“…One limitation of their use in the metallurgical state of highest strength (commonly called T6 or T651 temper) is the low resistance of these materials to structural corrosion (stress-corrosion cracking, exfoliation corrosion) [7,8]. In the past, the effects of the CAF process on microstructures and properties of aluminum alloy have been given attention [9]. Jeshvaghani et al [9,10] investigated the effects of time and temperature on the microstructure of a 7075 aluminum alloy sheet during CAF, and observed the evolution of matrix and grain boundary precipitates.…”

Section: Introductionmentioning

confidence: 99%

“…In the past, the effects of the CAF process on microstructures and properties of aluminum alloy have been given attention [9]. Jeshvaghani et al [9,10] investigated the effects of time and temperature on the microstructure of a 7075 aluminum alloy sheet during CAF, and observed the evolution of matrix and grain boundary precipitates. Guo et al [11] found that the external elastic tensile stress promotes the formation of precipitates and shortens the aging period of an Al-Zn-Mg-Cu alloy.…”

Section: Introductionmentioning

confidence: 99%

Effect of Creep Aging Process on Microstructures and Properties of the Retrogressed Al-Zn-Mg-Cu Alloy

Zhan

2016

Metals

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Abstract:The creep aging behaviors of retrogressed Al-Zn-Mg-Cu alloy were studied by uniaxial tensile creep tests at 140 • C. The effects of creep aging time and applied stress on microstructures and properties of the studied alloy were investigated by using transmission electron microscope (TEM), hardness, and corrosion resistance tests. Results show that the effects of the creep aging process on microstructures and properties are significant. The size of matrix precipitate (MPt), distance between MPts, width of precipitate-free zone (PFZ), and distance between grain boundary precipitates (GBPs) increase with the increase of creep aging time and applied stress. With the increase of creep aging time and applied stress, the corrosion resistance of the studied alloy improved. After creep aging for 20 h, the electrical conductivity varied with different applied stress from 35.99% to 37.24% International Annealed Copper Standard (IACS), and the exfoliation corrosion (EXCO) resistance increased to the corrosion rating of "EB", which express slight surface corrosion. Compared with the traditional retrogression and re-aging process (RRA), the retrogression and creep aging process (RCA) can increase the MPt size, widen the precipitates distribution, narrow the PFZ width, and enhance the corrosion resistance while offering the hardness comparable to that of the RRA process.

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“…Springback occurs because of limitations on the maximum usable temperature and the forming time dictated by microstructure requirements [5,6]. High levels of springback often result in the formed component being out of tolerance, extra after-work problems during final assembly, and also deficient aerodynamic behavior.…”

Section: Introductionmentioning

confidence: 99%

“…He showed that the springback is proportional to the ratio of yield strength to elastic modulus, / , and to bend ratio, / , where is the tool radius and is the sheet thickness. Jeshvaghani et al [6] claimed that springback increased with decreasing time and temperature and found the appropriate forming cycle (150 ∘ C/24 h) for AA7075. Jeunechamps et al [5] established an efficient numerical 2 Advances in Mechanical Engineering method and program to predict springback in CAF of aluminum shell components.…”

Section: Introductionmentioning

confidence: 99%

A Research on the Creep Age Forming of 2524 Aluminum Alloy: Springback, Mechanical Properties, and Microstructures

Zhan

Tan

Yang

et al. 2014

Advances in Mechanical Engineering

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A series of orthogonal tests have been designed to investigate the combined effects of aging temperature, time, predeformation, and part thickness features on the springback of creep age forming of 2524 aluminum alloy sheets. Two springback prediction models containing the four process parameters mentioned above are developed based on experimental results and the multiple linear regression method. The comparisons of predicted and experimental values of springback yield good agreement. The dependence of springback on stress gradient across the thickness of sheet is examined in detail, showing that springback increases with the decrease in stress gradient while maintaining the ratio of bending radius to sheet thickness (R 0 /H) as constant. In addition to springback, the mechanical properties and microstructural evolution are also researched. In the creep age forming process, the compression side of the sheet has higher mechanical properties and is characterized by more and finer precipitates in grains as compared to tension side.

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Effects of time and temperature on the creep forming of 7075 aluminum alloy: Springback and mechanical properties

Cited by 51 publications

References 16 publications

Simulation and estimation of parameters in reconfigurable multipoint forming processes of plates in the creep mode

Simulation and estimation of parameters in reconfigurable multipoint forming processes of plates in the creep mode

Effect of Creep Aging Process on Microstructures and Properties of the Retrogressed Al-Zn-Mg-Cu Alloy

A Research on the Creep Age Forming of 2524 Aluminum Alloy: Springback, Mechanical Properties, and Microstructures

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