Hot deformation behavior and flow stress modeling of annealed AZ61 Mg alloys

Liao, Chinghao; Wu, Horng-yu; Wu, Chung Hsien; Zhu, Feng-Jun; Lee, Shyong

doi:10.1016/j.pnsc.2014.04.006

Cited by 29 publications

(15 citation statements)

References 50 publications

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“…The stress-strain curves show flow-stress softening after the peak stress (σ p ) that appears to be more pronounced at lower temperatures or higher strain rates. Many magnesium alloys have been reported to exhibit similar behaviors [4,6,18,[25][26][27]. However, this description may be incorrect.…”

Section: Characteristics Of True Stress-true Strain Curvesmentioning

confidence: 99%

“…To evaluate the accuracy of the constitutive equation, the absolute relative error (E) between the calculated flow stress and the experimental flow stress given by Eq. (9) [18,29,30] was calculated at each strain, and averages over all the strains were calculated, (9) where σ e is the experimental flow stress, σ c is the calculated flow stress, and N is the number of data points at each strain.…”

Section: Constitutive Analysis Following the Standard Proceduresmentioning

confidence: 99%

“…This modeling is important for the precise simulation of metal forming process. Straindependent constitutive analysis that provides the hyperbolic sine constitutive equation that can be used to calculate the flow stress at any strain has been performed for many alloys [6,[13][14][15][16][17][18]. These studies investigated the hyperbolic sine…”

Section: Introductionmentioning

confidence: 99%

“…In most studies in the literature [6,[13][14][15][16][17][18], all four parameters were represented as functions of strain. Several researchers explored the possibility of reducing the number of strain-dependent parameters to understand the physical meaning of their dependence on strain [6,[19][20][21].…”

Section: Introductionmentioning

confidence: 99%

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Constitutive modeling and understanding of the hot compressive deformation of Mg–9.5Zn–2.0Y magnesium alloy with reduced number of strain-dependent constitutive parameters

Kim

Kwak

2017

Met. Mater. Int.

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The hot compressive flow behavior of the cast Mg-9.5Zn-2.0Y alloy as a function of strain was analyzed, and the degree of dependence of the parameters (A: material constant, n2: stress exponent, Qc: activation energy for plastic flow and : stress multiplier) of the constitutive equation ( ) upon the strain was examined in a systematic manner. This is to explore the possibility of representing the hot compressive deformation behavior of metallic alloys in a simple way by using a reduced number of strain-dependent constitutive parameters. The analysis results for several different cases can be interpreted as follows: (1) Qc can be treated as being strain-independent, which is physically sensible; (2) while only the microstructure changes as a function of strain at low flow stresses, as the flow stress increases, the power-law creep deformation and power-law breakdown mechanisms change; (3) the regime where only A is strain dependent expanded to higher strain rates and lower temperatures as the strain increased, suggesting that the number of the straindependent parameters decreases as the initial microstructure is refined by dynamic recrystallization, and the microstructure approaches a steady state.

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Section: Characteristics Of True Stress-true Strain Curvesmentioning

confidence: 99%

Section: Constitutive Analysis Following the Standard Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Constitutive modeling and understanding of the hot compressive deformation of Mg–9.5Zn–2.0Y magnesium alloy with reduced number of strain-dependent constitutive parameters

Kim

Kwak

2017

Met. Mater. Int.

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“…By compensating the strain rate in the Zener-Hollomon parameter (Z), Lin et al [13] revised the strain-dependent hyperbolic sine constitutive model to predict the hot deformation behavior of 42CrMo alloy. Later, the improved Arrheniustype equation was applied for describing the hot flow behaviors of P91 steel [14], as-cast Ti60 titanium alloy [15], 718 superalloy [16], AZ61 Mg alloys [17], etc. However, these Arrhenius-type constitutive models are not quite satisfied in some certain cases since it is difficult to accurately predict the complex non-linear relationship between flow stresses and processing parameters.…”

Section: Introductionmentioning

confidence: 99%

Prediction of hot deformation behavior in Ni-based alloy considering the effect of initial microstructure

Zuo

Liu

Wang

et al. 2015

Progress in Natural Science: Materials International

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High temperature heat treatments were conducted for as-cast N08028 alloy to obtain various microstructures with different amounts of σ-phase, and then hot compression tests were carried out using Gleeble-3500 thermo-mechanical simulator in deformation temperature range from 1100 to 1200 1C and strain rate range from 0.01 to 1 s À 1 . For the same initial microstructure, the flow stress was observed to increase with increasing the strain rate and decreasing the deformation temperature, while for the same deformation condition, the flow stress was found to increase with increasing the amount of σ-phase in the initial microstructure. Moreover, dynamic recrystallization was found to be the main dynamic soften mechanism. On this basis, Arrhenius-type constitutive equations and artificial neural network (ANN) model with back-propagation learning algorithm were established to predict hot deformation behavior of the alloy. Furthermore, the parameters of constitutive equations were found to be dependent on the initial microstructure, which was also as one of the inputs for the ANN model. Suitability of the two models was evaluated by comparing the accuracy, correlation coefficient and average absolute relative error, of the prediction. It is concluded that the ANN model is more accurately than the constitutive equations.

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Mechanical properties and failure behavior of AZ61 magnesium alloy at high temperatures

et al. 2018

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Hot deformation behavior and flow stress modeling of annealed AZ61 Mg alloys

Cited by 29 publications

References 50 publications

Constitutive modeling and understanding of the hot compressive deformation of Mg–9.5Zn–2.0Y magnesium alloy with reduced number of strain-dependent constitutive parameters

Constitutive modeling and understanding of the hot compressive deformation of Mg–9.5Zn–2.0Y magnesium alloy with reduced number of strain-dependent constitutive parameters

Prediction of hot deformation behavior in Ni-based alloy considering the effect of initial microstructure

Mechanical properties and failure behavior of AZ61 magnesium alloy at high temperatures

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