scholarly journals Effects of Bending Radius and Ageing Conditions on the Creep Age Forming of 7475 Aluminum Alloy

2013 ◽  
Vol 03 (03) ◽  
pp. 103-109
Author(s):  
运来 邓
Keyword(s):  
Aluminum Alloy ◽  
Bending Radius ◽  
Creep Age Forming

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

2014 ◽  
Vol 6 ◽  
pp. 707628 ◽  
Author(s):  
Lihua Zhan ◽  
Sige Tan ◽  
Youliang Yang ◽  
Minghui Huang ◽  
Wenqi Shen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Prediction Models ◽  
Stress Gradient ◽  
Sheet Thickness ◽  
Linear Regression Method ◽  
Forming Process ◽  
Bending Radius ◽  
Springback Prediction ◽  
Creep Age Forming

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 ( R0/ 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.

scholarly journals Evaluation of a 7050-TAF aluminum alloy submitted to creep age forming

2014 ◽  
Vol 17 (3) ◽  
pp. 603-611 ◽  
Author(s):  
Paulo Roberto Costa Junior ◽  
Carlos de Moura Neto ◽  
Darrell A. Wade
Keyword(s):  
Aluminum Alloy ◽  
Creep Age Forming

scholarly journals Advances and challenges on springback control for creep age forming of aluminum alloy

2021 ◽  
Author(s):  
Liwen Zhang ◽  
Heng Li ◽  
Tianjun Bian ◽  
Changhui Wu ◽  
Yang Gao ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Springback Control ◽  
Creep Age Forming

Creep age forming of 2124 aluminum alloy with single/double curvature

2013 ◽  
Vol 23 (7) ◽  
pp. 1922-1929 ◽  
Author(s):  
Jin ZHANG ◽  
Yun-lai DENG ◽  
Si-yu LI ◽  
Ze-yu CHEN ◽  
Xin-ming ZHANG
Keyword(s):  
Aluminum Alloy ◽  
Double Curvature ◽  
Creep Age Forming

Effect of Process Parameters on Microstructures of 7055 Aluminum Alloy in Creep Age Forming

2011 ◽  
Vol 80-81 ◽  
pp. 40-45 ◽  
Author(s):  
Li Hua Zhan ◽  
Yan Guang Li ◽  
Ming Hui Huang
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Aluminum Alloy ◽  
Grain Boundary ◽  
Process Parameters ◽  
Ageing Time ◽  
Aged Alloy ◽  
Transmission Electron ◽  
7055 Aluminum Alloy ◽  
Creep Age Forming

The effects of process parameters on evolution of microstructures of 7055 aluminum alloy in creep age forming were studied and the microstrucures were analyzed using transmission electron microscopy (TEM). Some important results are obtained: with the increasing of ageing time, the size of platelet shaped (known as Guinier-Preston (G-P) zones) precipitates and spherical shaped η' precipitates increased, the number of platelet shaped precipitates increased too, while the number of η' precipitates decreased; the precipitates with almost the same size distributed continuously and uniformly along the grain boundary with quite narrow precipitate free zones (PFZs) at 5 hours of ageing time, when the ageing time increases to 8 hours, the distribution of the precipitates along the grain boundary becomes discontinuous and the PFZs gets wider, while with the further increasing of the ageing time, the precipitates distributed continuously again along the grain boundary and the PFZs become more wider. From comparison of stress-aged alloy to stress-free-aged alloy, it was found that after 20 hours ageing, the precipitates in the stress-aged alloy are slightly coarser and the PFZs are wider, the density of retained η' is lower with the development of η phase.

Effect of pre-deformation on creep age forming of 2219 aluminum alloy: Experimental and constitutive modelling

2017 ◽  
Vol 683 ◽  
pp. 227-235 ◽  
Author(s):  
Youliang Yang ◽  
Lihua Zhan ◽  
Rulin Shen ◽  
Xuni Yin ◽  
Xicai Li ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Constitutive Modelling ◽  
2219 Aluminum Alloy ◽  
Creep Age Forming

Creep Age Formability of Friction Stir Welded 2A12 Aluminum Alloy Structures

2013 ◽  
Vol 753-755 ◽  
pp. 145-148
Author(s):  
Da Hai Liu ◽  
Jun Chu Li ◽  
Chun Chang
Keyword(s):  
Aluminum Alloy ◽  
Friction Stir Welding ◽  
Aluminum Alloys ◽  
Aging Time ◽  
Aging Temperature ◽  
Welded Structures ◽  
Friction Stir ◽  
Forming Characteristics ◽  
Welding Joints ◽  
Creep Age Forming

To establish the efficacy of creep age forming of the integrally friction stir welded panels, feasibility experiments were first conducted on friction stir welded rib-web panels of 2A12 aluminum alloys by using a designed air-loading age forming setup, and then related forming characteristics were investigated by using a mechanical-loading setup on the samples with and without friction stir welding joints. Results show that good age-formability can be observed from friction stir welded rib-web parts after creep age forming. The surface springback of the integral parts decreases with increasing the aging time and temperature. For 2A12 aluminum alloy, under an aging temperature of 190°C, a relatively better forming effect and strength can be reached at an aging time of about 8h. Compared with the non-welded structures, the introduction of friction stir welding will inhibit forming rate and will shorten the time of creep age forming.

Experimental Studies and FEM Analysis on the Creep Age Forming for Aluminium Alloy 7050

2013 ◽  
Vol 773-774 ◽  
pp. 144-152 ◽  
Author(s):  
Xia Huang ◽  
Yuan Song Zeng ◽  
Pen Tao Gai
Keyword(s):  
Aluminum Alloy ◽  
Constitutive Equations ◽  
Experimental Studies ◽  
Fem Analysis ◽  
Age Hardening ◽  
Maximum Relative Error ◽  
Forming Process ◽  
Creep Tests ◽  
Whole Process ◽  
Creep Age Forming

Creep age forming (CAF) is a combined creep forming and age hardening treatment process. How to control the springback after forming is one of the key problems for the process. In this paper, Creep tests were conducted for different stress levels at 160°C for 25h, which is the suitable parameters for CAF process of aluminum alloy 7050T451. Based on experimental results, a set of mechanism-based creep constitutive equations was formulated. The six material constants of the constitutive equations were determined by non-linear least squares fitting methods. The creep age forming process for aluminum alloy 7050T451 plate was simulated by using FE software ABAQUS through the subroutine CREEP. The effects of the forming parameters on the springback were analyzed. Finally, experimental research was performed. It is found that the developed numerical simulation can be used to simulate the whole process of creep age forming process. The maximum relative error is 6.9%.

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