Constitutive modeling for the dynamic recrystallization evolution of AZ80 magnesium alloy based on stress–strain data

2011 ◽  
Vol 528 (28) ◽  
pp. 8051-8059 ◽  
Author(s):  
Guo-Zheng Quan ◽  
Yu Shi ◽  
Yi-Xin Wang ◽  
Beom-Soo Kang ◽  
Tae-Wan Ku ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Dynamic Recrystallization ◽  
Constitutive Modeling ◽  
Stress Strain ◽  
Az80 Magnesium Alloy ◽  
Strain Data

scholarly journals Effect of Cyclic Expansion-Extrusion Process on Microstructure, Deformation and Dynamic Recrystallization Mechanisms, and Texture Evolution of AZ80 Magnesium Alloy

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Yong Xue ◽  
Shuaishuai Chen ◽  
Haijun Liu ◽  
Zhimin Zhang ◽  
Luying Ren ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Dynamic Recrystallization ◽  
Grain Refinement ◽  
Texture Evolution ◽  
Extrusion Process ◽  
Basal Texture ◽  
Continuous Dynamic Recrystallization ◽  
Distributed Structure ◽  
Texture Intensity ◽  
Az80 Magnesium Alloy

The microstructure, deformation mechanisms, dynamic recrystallization (DRX) behavior, and texture evolution of AZ80 magnesium alloy were investigated by three-pass cyclic expansion-extrusion (CEE) tests. Optical microscopy (OM), electron back-scattered diffraction (EBSD), and X-ray diffraction (XRD) were employed to study microstructure, grain orientation, DRX mechanism, and texture evolution. The results show that the grain sizes decrease continuously with the increase of CEE pass. The grain refinement effect of the first pass is the most remarkable, and there appear a large number of twins. After three-pass CEE, a well-distributed structure with fine equiaxed grains is obtained. With the increase of CEE pass, the deformation mechanism changes from twinning to slipping and the DRX mechanism changes mainly from twinning-induced dynamic recrystallization (TDRX) to rotation dynamic recrystallization (RDRX) and then to continuous dynamic recrystallization (CDRX). The grain misorientation between the new grains and matrix grains deceases gradually, and a relatively small angle misorientation is obtained after three-pass CEE. Grain misorientations of the first two passes are attributed to TDRX and RDRX behaviors, respectively. The grain refinement changes the deformation and DRX mechanisms of CEE process, which leads the (0002) basal texture intensity first decrease and then increase suddenly. Eventually, the extremely strong basal texture is formed after three-pass CEE.

A Study on Dynamic Recrystallization Behaviours of AZ80 Magnesium Alloy

2011 ◽  
Vol 189-193 ◽  
pp. 2847-2850
Author(s):  
Ming Yang ◽  
Yong Shun Yang ◽  
Dong Dong Yang
Keyword(s):  
Magnesium Alloy ◽  
Dynamic Recrystallization ◽  
Strain Rate ◽  
Dimensionless Parameter ◽  
Strain Rate Range ◽  
Avrami Exponent ◽  
Compression Tests ◽  
Rate Range ◽  
Recrystallization Kinetics ◽  
Az80 Magnesium Alloy

Using the compression tests on a Gleeble-1500 thermo-mechanical simulator to study the dynamic recrystallization behaviours of AZ80 magnesium alloy in the temperature range of 593-683K and strain rate range of 0.01-10s-1. By the analysis of the dynamic recrystallization kinetics, the Avrami exponent (m) and the constant (k) have been determined, and they aren’t constant and depend on the dimensionless parameter(Z/A).

Constitutive Equation of AZ80 Magnesium Alloy at Thermal Deformation

2011 ◽  
Vol 148-149 ◽  
pp. 762-765
Author(s):  
Zhong Tang Wang ◽  
Gen Fa Zhao ◽  
Shi Hong Zhang ◽  
Yong Gang Deng
Keyword(s):  
Magnesium Alloy ◽  
Constitutive Equation ◽  
Thermal Deformation ◽  
Stress Strain ◽  
Deformation Degree ◽  
Az80 Magnesium Alloy ◽  
Calculation Results ◽  
Relative Errors ◽  
Strain Model ◽  
Thermal Simulation Experiment

The curves of true stress-strain of AZ80 Magnesium alloy had been tested with thermal simulation experiment, at the conditions of the experimental temperature being 260°C~ 410°C, and strain-rate being 0.001~ 10s-1, and the deformation degree being 50％. According the Arrhenius equation, a kind of constitutive equation of AZ80 Magnesium alloy which considered the strain had been put forward, and the relative errors between calculation results by the stress-strain model and experiment results are less than 10.5%.

Study on the Effects of Deformation Temperature on Microstructure and Mechanical Properties of AZ80 Magnesium Alloy

2011 ◽  
Vol 117-119 ◽  
pp. 1003-1006
Author(s):  
Xu Bin Li ◽  
Zhi Min Zhang
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloy ◽  
Dynamic Recrystallization ◽  
Deformation Temperature ◽  
Deformation Process ◽  
Simulation Experiment ◽  
Optical Microscope ◽  
Microstructure And Mechanical Properties ◽  
Az80 Magnesium Alloy ◽  
Thermal Simulation Experiment

The effects of deformation temperature on microstructure and mechanical properties of AZ80 magnesium alloy were investigated. The mechanical properties and microstructure were carried out in Gleeble-1500 thermal simulation experiment and optical microscope. The extrusion deformation, dynamic recrystallization had taken place in all the deformation samples, grains were thinner than before deformation.The reasonable deformation process can make the dynamic recrystallization organization of grain smaller and obtain higher strength. The best deformation temperature was about 360°C to 390 °C.

Thermal Deformation Property and Constitutive Model of AZ80 Magnesium Alloy

2013 ◽  
Vol 712-715 ◽  
pp. 674-677
Author(s):  
Fang Wang ◽  
Zhong Tang Wang
Keyword(s):  
Grain Size ◽  
Magnesium Alloy ◽  
Constitutive Model ◽  
Dynamic Recrystallization ◽  
Strain Rate ◽  
Thermal Deformation ◽  
Deformation Property ◽  
Az80 Magnesium Alloy ◽  
Calculation Results ◽  
Relative Errors

Thermal Deformation Property and Constitutive Model of AZ80 Magnesium Alloy had been studied with thermal simulation experiment. Dynamic recrystallization for AZ80 magnesium alloy had occurred under different strain rate at 583K(310°C). Dynamic recrystallization had occurred more completely and the grain size was reducing with increasing of strain rate. Dynamic recrystallization had occurred more completely and the grain size was reducing with increasing of strain rate. According the Arrhenius equation, a kind of constitutive equation of AZ80 Magnesium alloy which considered the strain had been put forward, and the relative errors between calculation results by the stress-strain model and experiment results are less than 10.5%.

scholarly journals Study on critical damage factor and the constitutive model including dynamic recrystallization softening of AZ80 magnesium alloy

2013 ◽  
Vol 45 (2) ◽  
pp. 199-208 ◽  
Author(s):  
Y. Xue ◽  
Z.M. Zhang ◽  
Y.J. Wu
Keyword(s):  
Magnesium Alloy ◽  
Constitutive Model ◽  
Dynamic Recrystallization ◽  
Strain Rates ◽  
Damage Factor ◽  
Strain And Strain Rate ◽  
Az80 Magnesium Alloy ◽  
Az80 Alloy ◽  
Process Simulator ◽  
Critical Damage

Quantities AZ80 magnesium alloy billets were compressed with 60 % height reduction on hot process simulator at 473, 523, 573, 623, 673, 723 K under strain rates of 0.001, 0.01, 0.1, 1 and 10 s-1. In order to predict the occurrence of surface fracture, the critical damage factor based on the Cockcroft-Latham equation were obtained by analysing the results of the corresponding finite element calculation. The results show that the critical damage factor at 523, 573, 623, 673 K under strain rates of 0.001, 0.01, 0.1 and 1 s-1 is not a constant but varies in a range from 0.1397 to 0.4653. Meanwhile, a constitutive model with a few parameters is used to characterize the dynamic recrystallization strain softening of AZ80 alloy, which comprehensively reflect the effects of the deformation temperature, strain and strain rate on the flow stress.

Sign in / Sign up

Export Citation Format

Share Document