Experimental studies and constitutive modelling of the hardening of aluminium alloy 7055 under creep age forming conditions

Zhan, Lihua; Lin, Jianguo; Dean, Trevor; Huang, Ming‐Hui

doi:10.1016/j.ijmecsci.2011.05.006

Cited by 146 publications

(100 citation statements)

References 22 publications

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“…The constitutive equations proposed by Zhan et al [12] were selected and are presented as Eqs. (1)- (7).…”

Section: Constitutive Equationsmentioning

confidence: 99%

“…Zhan et al [12] proposed a set of mechanism-based unified creep-aging constitutive equations to model creep deformation and the evolutions of precipitate size and dislocation density, which control the amount of age hardening, solid solution hardening and work hardening during creep-ageing. The model was applied to the creepageing treatment of AA7055 from the as-quenched or T3 to T4 conditions.…”

Section: Introductionmentioning

confidence: 99%

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Constitutive modelling of creep-ageing behaviour of peak-aged aluminium alloy 7050

Yang

Lam

Shi

et al. 2015

MATEC Web of Conferences

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Abstract. The creep-ageing behaviour of a peak-aged aluminium alloy 7050 was investigated under different stress levels at 174• C for up to 8 h. Interrupted creep tests and tensile tests were performed to investigate the influences of creep-ageing time and applied stress on yield strength. The mechanical testing results indicate that the material exhibits an over-ageing behaviour which increases with the applied stress level during creep-ageing. As creep-ageing time approaches 8 h, the material's yield strength under different stress levels gradually converge, which suggests that the difference in mechanical properties under different stress conditions can be minimised. This feature can be advantageous in creep-age forming to the formed components such that uniformed mechanical properties across part area can be achieved. A set of constitutive equations was calibrated using the mechanical test results and the alloy-specific material constants were obtained. A good agreement is observed between the experimental and calibrated results.

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“…The constitutive equations proposed by Zhan et al [12] were selected and are presented as Eqs. (1)- (7).…”

Section: Constitutive Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Constitutive modelling of creep-ageing behaviour of peak-aged aluminium alloy 7050

Yang

Lam

Shi

et al. 2015

MATEC Web of Conferences

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“…In order for the described behaviour of 7B04 to be modelled, the multiaxial unified constitutive equations proposed by Zhan et al [8] were adapted:…”

Section: Matec Web Of Conferencesmentioning

confidence: 99%

“…(1) describes the rate of creep strain accumulation, which is not only a function of stress but also of dislocation density and yield strength ( y ). Readers are referred to [8] for detailed descriptions of Eqs. (1)-(7).…”

Section: Matec Web Of Conferencesmentioning

confidence: 99%

Material modelling for creep-age forming of aluminium alloy 7B04

Lam

Shi

Huang

et al. 2015

MATEC Web of Conferences

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Abstract. This paper presents a study on the creep-ageing behaviour of a peak-aged aluminium alloy 7B04 under different tensile loads at 115 o C and subsequently modelling it for creep-age forming (CAF) applications. Mechanical properties and microstructural evolutions of creep-aged specimens were investigated. The material was modelled using a set of unified constitutive equations, which not only captures the material's creep deformation but also takes into account yield strength contributions from solid solution hardening, age hardening and dislocation hardening during creep-ageing. A possible application of the present work is demonstrated by implementing the determined material model into a commercial finite element analysis solver via a user-defined subroutine for springback prediction of creep-age formed plates. A good agreement is observed between the simulated springback values and experimental results. This material model now enables further investigations of 7B04 under various CAF scenarios to be conducted inexpensively via computational modelling.

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“…CAF simultaneously strengthens the part and changes its shape, resulting in a one-step forming and heat treatment process that can largely increase the mechanical properties. With the increasingly high performance requirements on the formed components, the aims of study on CAF should not only satisfy the needs of precision shape forming, but also meet the needs of high performance of the formed products [3][4][5]. However, controlling material performance is very difficult due to the presence of heavy interaction between creep and aging in the CAF process.…”

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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Experimental studies and constitutive modelling of the hardening of aluminium alloy 7055 under creep age forming conditions

Cited by 146 publications

References 22 publications

Constitutive modelling of creep-ageing behaviour of peak-aged aluminium alloy 7050

Constitutive modelling of creep-ageing behaviour of peak-aged aluminium alloy 7050

Material modelling for creep-age forming of aluminium alloy 7B04

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

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