Steady State and Transient Plastic Flow of Aluminium and Aluminium Alloys

Mecking, H.; Styczynski, A.; Estrin, Yuri

doi:10.1016/b978-0-08-034804-9.50156-x

Cited by 6 publications

(17 citation statements)

References 2 publications

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“…330°C , and a break stress is added to the internal stress in Eq. (24). The result is shown in Figure 7 for oxygen-free copper (Cu-OF) with and without phosphorus.…”

Section: Solid Solutionmentioning

confidence: 94%

“…(12) that should be used in Eq. (24). In addition, we saw in Section 3.4 that the expression for the enhancement factor for the climb mobility g climb due to the raised vacancy concentration in Eq.…”

Section: Pure Elementsmentioning

confidence: 99%

“…(22), which can then be applied to derive the creep rate. Direct comparison between g climb and f clglide is shown in Figures 2 and 3 The values of stresses and strain rates are taken from experimental creep data [24].…”

Section: The Climb-glide Mobilitymentioning

confidence: 99%

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Fundamental Models for the Creep of Metals

Sandström¹

2018

Creep

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“…330°C , and a break stress is added to the internal stress in Eq. (24). The result is shown in Figure 7 for oxygen-free copper (Cu-OF) with and without phosphorus.…”

Section: Solid Solutionmentioning

confidence: 94%

Section: Pure Elementsmentioning

confidence: 99%

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Fundamental Models for the Creep of Metals

Sandström¹

2018

Creep

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“…ρ m is the initial mobile dislocation density. The relationship between initial mobile dislocation density, initial dislocation density and stress (σ) is derived in Estrin and Mecking, as shown in Equation (11) [33,34]. The initial dislocation density and thus the dislocation hardening effect should increase with increasing pre-strain level.…”

Section: Constitutive Modeling and The Determination Of Materials Paramentioning

confidence: 99%

Stress Relaxation Aging Behavior and Constitutive Modelling of AA7150-T7751 under Different Temperatures, Initial Stress Levels and Pre-Strains

Cai

Zhan

et al. 2019

Metals

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Age forming is an advanced manufacture technology for forming large aluminum panels. Temperature, initial stress level and pre-strains have a great effect on the formability and performance. The stress relaxation aging behavior of AA7150-T7751 under different temperatures, initial stress levels and pre-strains was studied through stress relaxation tests, tensile tests and TEM observations. The results show that the formability can be improved with the increase of temperature, initial stress levels and pre-strains. Deformation mechanisms during stress relaxation of the material were analyzed on the basis of creep stress exponent and apparent activation energy. The aging precipitates of the studied alloy were not sensitive to the age forming conditions, but drastically coarsened at over aging temperature, which decreased the mechanical properties. In addition, the relationship between stress relaxation behavior and aging strengthening is discussed. Based on the dislocation theory and the modified Arrhenius equation, a stress relaxation constitutive equation considering the initial mobile dislocation density and temperature dependent activation energy was established. This model can predict very well the stress relaxation behavior under various temperature, stress level and pre-strain conditions, with an average error of 2%.

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“…Figure 1 plots the steady-state creep rate as a function of stress for Al 99.999% [16] and the model curves given by Equations ( 10) and ( 11) with C L = 86, U ss = 0, Q cg = Q sd = 122 kJ•mol −1 , and D cg = D 0sd = 8.34 × 10 −6 m 2 •s −1 [13]. The original Figure in [13] was obtained by taking ω = 15; in this study, the value ω = 0 was used, which demonstrates that the simplified model of Equation ( 5) still works very well.…”

Section: Description Of High Purity Aluminiummentioning

confidence: 99%

A Unified Physical Model for Creep and Hot Working of Al-Mg Solid Solution Alloys

Spigarelli

Paoletti

2017

Metals

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The description of the dependence of steady-state creep rate on applied stress and temperature is almost invariably based on the Norton equation or on derived power-law relationships. In hot working, the Norton equation does not work, and is therefore usually replaced with the Garofalo (sinh) equation. Both of these equations are phenomenological in nature and can be seldom unambiguously related to microstructural parameters, such as dislocation density, although early efforts in this sense led to the introduction of the "natural power law" with exponent 3. In an attempt to overcome this deficiency, a recent model with sound physical basis has been successfully used to describe the creep response of fcc metals, such as copper. The main advantage of this model is that it does not require any data fitting to predict the strain rate dependence on applied stress and temperature, which is a particularly attractive peculiarity when studying the hot workability of metals. Thus, the model, properly modified to take into account solid solution strengthening effects, has been here applied to the study of the creep and hot-working of simple Al-Mg single phase alloys. The model demonstrated an excellent accuracy in describing both creep and hot working regimes, still maintaining its most important feature, that is, it does not require any fitting of the experimental data.

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Steady State and Transient Plastic Flow of Aluminium and Aluminium Alloys

Cited by 6 publications

References 2 publications

Fundamental Models for the Creep of Metals

Fundamental Models for the Creep of Metals

Stress Relaxation Aging Behavior and Constitutive Modelling of AA7150-T7751 under Different Temperatures, Initial Stress Levels and Pre-Strains

A Unified Physical Model for Creep and Hot Working of Al-Mg Solid Solution Alloys

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