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

Yang, Youliang; Zhan, Lihua; Shen, Rulin; Yin, Xi-Jun; Li, Xicai; Li, Wenke; Huang, Ming‐Hui; He, Diqiu

doi:10.1016/j.msea.2016.12.024

Cited by 59 publications

(13 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The material elongation decreased significantly when preliminary loadings occurred. Papers by Yang et al (2016Yang et al ( , 2017 concerned tests of alloy 2219. The influence of creep pre-deformation at a constant temperature (165 • C) at different load levels and for different aging times on the material yield point value was analyzed in those papers.…”

Section: Introductionmentioning

confidence: 99%

Monotonic behaviour of typical Al-Cu-Mg alloy pre-strained at elevated temperature

Tomczyk

Seweryn

Doroszko

2018

jtam

View full text Add to dashboard Cite

This paper presents results of monotonic tensile and creep tests conducted on typical Al-Cu-Mg alloy (commercial 2024) specimens. Tensile tests carried out at room (20 • C) and elevated (100 • C, 200 • C, 300 • C) temperatures made it possible to determine strength properties of the material (Young's modulus, yield stress, ultimate tensile strength). Creep tests were performed at elevated temperature (100 • C, 200 • C and 300 • C) with a constant force. In order to obtain material creep characteristics, creep-rupture tests were carried out. Then creep tests were conducted with two different strain values: one corresponding to the beginning of the secondary creep and the other corresponding to a certain value of the tertiary creep. After preliminary creep deformation at two various strain levels, specimens were cooled at ambient temperature and then subjected to monotonic tensile tests. The characteristics of the material were obtained for pre-strained specimens at different temperatures. Specimens fracture surfaces obtained as a result of tensile (at elevated and room temperature), creep and combined tests were analyzed.

show abstract

Section: Introductionmentioning

confidence: 99%

Monotonic behaviour of typical Al-Cu-Mg alloy pre-strained at elevated temperature

Tomczyk

Seweryn

Doroszko

2018

jtam

View full text Add to dashboard Cite

show abstract

“…The creep behavior of aluminum alloys is very complicated and is usually accompanied by the combination changes such as creep strain, stress relaxation and micro-structure state, and so on. The effect of pre-stretching on alloy plates originates mainly from microstructure evolution, such as dislocation motion, grain growth, grain boundary slip, and second-phase precipitation, and the diffusion mechanism which are mainly induced by dislocation, precipitates and solute-matrix bonding [22]. For convenience in engineering application, Kowalewski et al [23] have proposed a unified creep damage model which can reflect the creep behaviors from the primary creep stage to the accelerated creep stage.…”

Section: Establishment Of Materials Modelmentioning

confidence: 99%

Effect of Pre-Stretching on Microstructures and Mechanical Behaviors of Creep-Aged 7055 Al Alloy and Its Constitutive Modeling

Zuo

Cao

et al. 2019

Metals

View full text Add to dashboard Cite

The rational pre-stretching can contribute to obtaining better mechanical properties. This paper studies the effect of creep stain, mechanical properties, and microstructures of 7055 alloy under different pre-stretching conditions. The results show that compared with solid-quenched alloy, the 7055-T6 alloy is the optimal scheme to attain more creep strain, and the range of pre-stretching from 1.6% to 3.3% is suitable for creep-aged 7055-T6 alloy to obtain better mechanical properties. Further examination by TEM test shows that pre-stretching promotes the formation of dislocations, which provides superior nucleation regions for ή phase resulting in a higher strength alloy. Meanwhile, a unified creep-aging constitutive model for 7055-T6 alloy is established which can be used to accurately predict its creep behavior under the different pre-stretching.

show abstract

“…The maximum creep strain for h/t = 3 is 0.59%, which is much bigger than that for h/t = 0. This is because the plastic deformation produced during loading stage is equivalent to a pre-deformation for the material, promoting the creep deformation during the creep aging stage [26]. Figure 15 shows the creep strain distribution of AA7050 ribbed panels creep aged for 12 h. The creep deformation of the panel of h/t = 0 is homogeneous, and the maximum creep strain is 0.04%.…”

Section: Fe Model Validation Based On Springbackmentioning

confidence: 99%

Damage in Creep Aging Process of an Al-Zn-Mg-Cu Alloy: Experiments and Modeling

Lei

et al. 2018

Metals

View full text Add to dashboard Cite

In creep age forming (CAF), large integral panel components of high-strength aluminum alloy can be shaped and strengthened under external elastic loading at an elevated temperature through creep deformation and age hardening, simultaneously. However, the high ribbed structure on panel may induce stress concentration, inhomogeneous plastic deformation and even damage evolution on the bending rib, leading to the difficulty in controlling forming precision and material properties. Therefore, the generation and evolution of damage are necessary to be considered in the design of CAF. Taking 7050 aluminum alloy as the case material, the continuous and interrupted creep aging tests at 165 • C and three stress levels (300, 325, and 350 MPa) were conducted, and the corresponding material properties, precipitate, and damage microstructures were studied by mechanical properties tests, transmission electron microscope (TEM) and scanning electron microscope (SEM) characterizations. With the increase of stress level, the creep deformation occurs easier, the precipitates grow up faster, the creep damage occurs earlier, the growth rate and the size of microvoids increase, the mechanical properties decrease more rapidly, and the dominant mechanism of creep fracture changes from shear to microvoid coalescence. To simulate creep aging behavior with damage, a continuum damage mechanics (CDM) based model is calibrated and numerically implemented into ABAQUS solver via CREEP subroutine. The CAF of 7050 aluminum alloy panels with different height ribs were conducted by experiment and FE simulation. The forming process presents a typical stress relaxation phenomenon. The creep damage mainly occurs on the bending rib due to the severe stress concentration. With the increase of rib height, the creep strain and damage degree increase, but the springback decreases.

show abstract

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

Cited by 59 publications

References 23 publications

Monotonic behaviour of typical Al-Cu-Mg alloy pre-strained at elevated temperature

Monotonic behaviour of typical Al-Cu-Mg alloy pre-strained at elevated temperature

Effect of Pre-Stretching on Microstructures and Mechanical Behaviors of Creep-Aged 7055 Al Alloy and Its Constitutive Modeling

Damage in Creep Aging Process of an Al-Zn-Mg-Cu Alloy: Experiments and Modeling

Contact Info

Product

Resources

About