Study on hot deformation behavior of homogenized Mg-8.5Gd-4.5Y-0.8Zn-0.4Zr alloy using a combination of strain-compensated Arrhenius constitutive model and finite element simulation method

Hu, Li; Lang, Mengwei; Shi, Liangliang; Li, Mingao; Zhou, Taofa; Bao, Chengli; Yang, Ming‐Bo

doi:10.1016/j.jma.2021.07.008

Cited by 24 publications

(12 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The equivalent plastic strain distribution of the whole specimen is not uniform. This is mainly due to the friction between the punch and the sample surface during compression, which is consistent with a previous investigation of the Mg-8.5Gd-4.5Y-0.8Zn-0.4Zr alloy [ 37 ].…”

Section: Resultssupporting

confidence: 92%

Mechanical Behavior and Constitutive Modeling of the Mg-Zn-Y Alloy in an Electrically Assisted Tensile Test

Yang

Fan

et al. 2022

Materials

View full text Add to dashboard Cite

The Mg-Zn-Y alloy containing the LPSO phase has excellent mechanical properties and functional application prospects. In an effort to clarify the electrically assisted deformation behavior of the Mg-Zn-Y alloy, electrically assisted tensile tests of Mg98.5Zn0.5Y1 alloy sheets were carried out at different temperatures, current densities, duty ratios, and frequencies. The experimental results showed that, after the pulse current was applied (26.58 A·mm−2), the peak stress of the sample deformed at 200 °C decreased by 8 MPa. The peak stress of the material decreased with the increase in current density. It is noticeable that the changes in duty ratios and frequencies have a small effect on the peak stress and strain. When the current was applied, more recrystallized grains appeared in the alloy and the basal texture was weakened. According to the experimental results, the Arrhenius model was derived based on the Zener–Hollomon parameter. Owing to the appearance of the stacking fault structure (LPSO), the activation energy Q of the Mg98.5Zn0.5Y1 alloy was 389.41 KJ/mol, which is higher than conventional Mg alloys. Moreover, the constitutive equation of the electro plastic effect coupled with temperature and pulse current parameters was established by introducing electrically assisted characteristics. By comparing the experimental and predicted values, the established model can effectively predict the variation trend of flow stress under electrically assisted deformation. Moreover, the constitutive model was incorporated into the UHARD subroutine of ABAQUS software to study the deformation behavior of the Mg98.5Zn0.5Y1 alloy.

show abstract

Section: Resultssupporting

confidence: 92%

Mechanical Behavior and Constitutive Modeling of the Mg-Zn-Y Alloy in an Electrically Assisted Tensile Test

Yang

Fan

et al. 2022

Materials

View full text Add to dashboard Cite

show abstract

“…An Arrhenius-type equation was used to characterize the relationship between the hot-deformation parameters [ 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 ], as follows:

where

was the strain rate (s −1 ),

was the flow stress (MPa), Q was the apparent deformation-activation energy (kJ/mol),

was the deformation temperature (K),

was the gas constant (R = 8.314 J/mol K), and A,

were material constants. In addition,

.…”

Section: Resultsmentioning

confidence: 99%

“…The grain size of the alloy grew rapidly in the 723–773 K deformation temperature range. The Zener–Hollomon (

) parameters determine whether dynamic recrystallized grains were refined during plastic deformation [ 22 ]. With the increase in deformation temperature, the Z value was larger, which weakened the grain refining effect of DRX and resulted in coarse recrystallized grains [ 15 ].…”

Section: Resultsmentioning

confidence: 99%

“…It is well known that constitutive equation analysis has become an effective method to present the thermal deformation behavior of metal materials [ 22 ]. The flow behavior of materials during thermal deformation is complicated and is mainly affected by deformation parameters (e.g., strain rate, deformation temperature and deformation degree, etc.).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Hot Deformation Behavior, Processing Maps and Microstructural Evolution of the Mg-2.5Nd-0.5Zn-0.5Zr Alloy

Wang

Yang

et al. 2022

Materials

View full text Add to dashboard Cite

Isothermal hot compression experiments were conducted on Mg-2.5Nd-0.5Zn-0.5Zr alloy to investigate hot deformation behavior at the temperature range of 573–773K and the strain rate range of 0.001s−1–10s−1 using a Gleeble-3500D thermomechanical simulator. The results showed that the rheological curve showed a typical work hardening stage, and there were three different stages: work hardening, transition and steady state. A strain compensation constitutive model was established to predict the flow stress of the Mg-2.5Nd-0.5Zn-0.5Zr alloy, and the results proved that it had high predictability. The main deformation mechanism of the Mg-2.5Nd-0.5Zn-0.5Zr alloy was dislocation climbing. The processing maps were established to distinguish the unstable region from the working region. The maps showed that the instability generally occurred at high strain rates and low temperatures, and the common forms of instability were cracking and flow localization. The optimum machining range of the alloy was determined to be 592–773K and 0.001–0.217 s−1. With the increase in deformation temperature, the grain size of the alloy grew slowly at the 573–673K temperature range and rapidly at the 673–773K temperature range.

show abstract

“…For example, deformation at lower strain rates in the present alloy, where the nucleation and growth of DRX grains are completed entirely, results in the elimination of dislocations. An increase in strain rate will contribute to insufficient DRX, rapid pile-up and tangling of dislocation and enhanced work hardening effects; thereby, the deformation resistance is increased [30,31]. Values of Z and lnZ under different deformation conditions are estimated and displayed in Figure 6b.…”

Section: Constitutive Modelmentioning

confidence: 99%

Deformation Behavior and Dynamic Recrystallization of Mg-1Li-1Al Alloy

Feng

Pang

et al. 2021

Metals

View full text Add to dashboard Cite

In this paper, the hot workability of Mg-1Li-1Al (LA11) alloy is assessed through a uniaxial compression test in a temperature range from 200 to 400 °C and a strain rate, έ, of 1–0.01 s−1. The present study reveals that flow stress increases when the strain rate increases and deformation temperature decreases. Based on the hyperbolic sine equation, the flow stress constitutive equation of this alloy under high-temperature deformation is established. The average activation energy was 116.5 kJ/mol. Avrami equation was employed to investigate the dynamic recrystallization (DRX). The DRX mechanism affected by the deformation conditions and Zener–Hollomon parameters is revealed. Finally, the relationship between DRX volume fraction and deformation parameter is verified based on microstructure evolution, which is consistent with the theoretical prediction.

show abstract

Study on hot deformation behavior of homogenized Mg-8.5Gd-4.5Y-0.8Zn-0.4Zr alloy using a combination of strain-compensated Arrhenius constitutive model and finite element simulation method

Cited by 24 publications

References 25 publications

Mechanical Behavior and Constitutive Modeling of the Mg-Zn-Y Alloy in an Electrically Assisted Tensile Test

Mechanical Behavior and Constitutive Modeling of the Mg-Zn-Y Alloy in an Electrically Assisted Tensile Test

Hot Deformation Behavior, Processing Maps and Microstructural Evolution of the Mg-2.5Nd-0.5Zn-0.5Zr Alloy

Deformation Behavior and Dynamic Recrystallization of Mg-1Li-1Al Alloy

Contact Info

Product

Resources

About