Texture Evolution during Uniaxial Compression of Hot-Rolled AZ31 Mg Alloy

2007 ◽  
Vol 539-543 ◽  
pp. 1713-1718 ◽  
Author(s):  
Shi Hoon Choi ◽  
B.J. Kim ◽  
S.I. Kim ◽  
U.S. Joon
Keyword(s):  
Uniaxial Compression ◽  
Electron Backscatter Diffraction ◽  
Texture Evolution ◽  
Relative Activity ◽  
Deformation Twinning ◽  
Mg Alloy ◽  
Compression Tests ◽  
Az31 Mg Alloy ◽  
Crystallographic Slip ◽  
Hot Rolled

Uniaxial compression tests on hot-rolled AZ31 Mg alloy were carried out at 200°C. In order to investigate the evolution of texture during plastic deformation, cylindrical specimens were compressed to the rolling and normal directions. Experimental investigation reveals that work hardening and texture evolution are strongly dependent on the loading direction. The occurrence of deformation twinning was revealed by the observation of microtexture using electron backscatter diffraction (EBSD). A visco-plastic self-consistent (VPSC) polycrystal model was used to simulate the texture evolution during the uniaxial compression. The texture evolution induced by crystallographic slip and deformation twinning can be explained by the relative activity of each deformation modes.

Implementation of Twin Reorientation and Softening Schemes in a Polycrystal Plasticity Model for Mg Alloys

2007 ◽  
Vol 558-559 ◽  
pp. 1063-1068
Author(s):  
Shi Hoon Choi ◽  
Y.S. Song ◽  
Jong Kweon Kim ◽  
B.J. Jung ◽  
Yong Bum Park
Keyword(s):  
Uniaxial Compression ◽  
Work Hardening ◽  
Electron Backscatter Diffraction ◽  
Texture Evolution ◽  
Rolling Direction ◽  
Peak Stress ◽  
Deformation Twinning ◽  
Compression Tests ◽  
Polycrystal Plasticity ◽  
Hot Rolled

Uniaxial compression tests on hot-rolled AZ31 Mg alloy were carried out at a temperature of 300°C. In order to investigate work hardening and texture evolution during plastic deformation, cylindrical specimens were compressed to the rolling direction. Experimental investigation reveals that flow curves are strongly dependent on microstructure evolution such as deformation twinning and softening phenomenon. The occurrence of deformation twinning and softening phenomenon was revealed by the observation of microtexture using electron backscatter diffraction (EBSD). A visco-plastic self-consistent (VPSC) polycrystal model was used to simulate the work hardening, softening and texture evolution during the uniaxial compression. In order to calculate orientation of deformation twins, predominant twin reorientation (PTR) scheme was implemented into the polycrystal model. A softening scheme was also implemented in the polycrystal model to predict softening phenomenon and texture evolution after a peak stress.

Texture Evolution during Hot Rolling Deformation in Al-5wt%Mg Alloy

2007 ◽  
Vol 345-346 ◽  
pp. 89-92
Author(s):  
Shi Hoon Choi ◽  
Y.S. Song ◽  
Jong Kweon Kim ◽  
Hyoung Wook Kim ◽  
Suk Bong Kang
Keyword(s):  
Hot Rolling ◽  
Electron Backscatter Diffraction ◽  
Texture Evolution ◽  
Surface Region ◽  
Alloy Sheet ◽  
Mg Alloy ◽  
Strip Cast ◽  
Hot Rolled ◽  
Backscatter Diffraction ◽  
Rolling Deformation

Evolution of crystallographic texture by hot rolling deformation at the temperature of 200°C was investigated by hot rolling tests on as-cast Al-5wt%Mg alloy fabricated by a new strip cast technology. Texture variation through the thickness direction in the Al-5wt%Mg alloy was examined experimentally. Macrotexture and microtexture measurements were conducted using X-ray diffractometer and electron backscatter diffraction (EBSD), respectively. Experimental investigation reveals that the evolution of texture and microstructure is strongly dependent on a distance from center of the Al-5wt%Mg alloy sheet. It was found that the shear texture components tend to be increased at the surface region of the hot-rolled specimen.

scholarly journals Microstructure and texture evolution of AZ31 Mg alloy after uniaxial compression and annealing

2019 ◽  
Vol 7 (1) ◽  
pp. 124-133 ◽  
Author(s):  
Fadi Abouhilou ◽  
Abdelkader Hanna ◽  
Hiba Azzeddine ◽  
Djamel Bradai
Keyword(s):  
Uniaxial Compression ◽  
Texture Evolution ◽  
Mg Alloy ◽  
Az31 Mg Alloy

Microstructure Evolution of AZ31 Magnesium Alloy during Warm Compression Forming

2007 ◽  
Vol 539-543 ◽  
pp. 1813-1817
Author(s):  
Zhi Min Zhang ◽  
Qiang Wang ◽  
B.C. Li ◽  
X. Zhang
Keyword(s):  
Microstructural Evolution ◽  
Room Temperature ◽  
Effective Strain ◽  
Mg Alloy ◽  
Compression Tests ◽  
Az31 Mg Alloy ◽  
Microstructural Evaluation ◽  
Mean Size ◽  
The Mean ◽  
Different Thickness

Warm compression tests of AZ31 Mg alloy were carried out at five temperatures in 30°C intervals from 210°C to 330°C. The samples of different thickness which were machined from as-cast and pre-strained AZ31 billets were compressed into thickness 1mm and then cooled in the air to room temperature. The microstructural evolution of AZ31 Mg alloy was investigated during warm compression forming. The results show that all the samples have undergone a microstructure changes to different scales in the range investigated. The twinning is the predominant deformation mechanism for magnesium alloys at moderate temperatures and its occurrence is dependent on temperature and strain. Microstructural evaluation indicates that the mean size of the recrystallised grains decreases with increasing effective strain and temperature because of sufficient dynamic recrystallization. The original grain has significant influence on microstructural evolution during warm forming.

Mechanical Properties and Texture Evolution of AZ31 Mg Alloy during Equal Channel Angular Pressing

2005 ◽  
Vol 475-479 ◽  
pp. 545-548 ◽  
Author(s):  
Hyo Tae Jeong ◽  
Woo Jin Kim
Keyword(s):  
Mechanical Properties ◽  
Grain Refinement ◽  
Equal Channel Angular Pressing ◽  
Texture Evolution ◽  
Fiber Texture ◽  
Mg Alloy ◽  
Angular Pressing ◽  
Ecap Process ◽  
Az31 Mg Alloy ◽  
Similar Texture

Microstructure and texture evolution in the AZ31 Mg alloy subject to equal channel angular pressing (ECAP) have been investigated and correlated with the mechanical properties. When AZ31 Mg alloy was ECAPed up to 8 passes following the route Bc, grain refinement occurred effectively. Texture was also changed during ECAP. The original fiber texture of the extruded AZ31 Mg alloy changed to a new texture component of ] 1 3 2 5 )[ 1 1 01 ( , and the texture of ] 1 3 2 5 )[ 1 1 01 ( orientation was rotated to ] 0 2 5 7 )[ 6 4 13 ( orientation after 6-pass ECAP process. The variation of the strength with the pass number was explained by the texture and grain size. The strength data of AZ31 Mg alloys followed the standard Hall-Petch relationship when the similar texture was retained during the ECAP process. Otherwise the effect of texture on strength was dominant over the strengthening due to grain refinement.

Tensile properties of hot rolled AZ31 Mg alloy sheets at elevated temperatures

2004 ◽  
Vol 378 (1-2) ◽  
pp. 184-187 ◽  
Author(s):  
A. Jäger ◽  
P. Lukáč ◽  
V. Gärtnerová ◽  
J. Bohlen ◽  
K.U. Kainer
Keyword(s):  
Tensile Properties ◽  
Elevated Temperatures ◽  
Mg Alloy ◽  
Az31 Mg Alloy ◽  
Hot Rolled

The Microstructure Evolution and Twinning Characterization of AZ31 Mg Alloy Sheet in Low-Temperature Bending Process

2013 ◽  
Vol 690-693 ◽  
pp. 16-19
Author(s):  
Jun Wei Liu ◽  
Shi Qiang Lu ◽  
Ke Lu Wang ◽  
Gui Fa Li ◽  
Xuan Xiao
Keyword(s):  
Low Temperature ◽  
Microstructure Evolution ◽  
Room Temperature ◽  
Alloy Sheet ◽  
Mg Alloy ◽  
Az31 Mg Alloy ◽  
Bending Process ◽  
Hot Rolled ◽  
The Relationship

The relationship among stress, cavities and twinning in the room-temperature bending process of hot-rolled AZ31 Mg alloy sheet was researched. It can be seen that the mount of twins which was tightly affected by stress value increases with the distance to press point. Otherwise, the cavities and twinning which seem totally independent, in fact affect with each other. Some cavities were hindered by twins and can not further grow up. Then, the relationship between slip and twinning was also roughly discussed. The dislocation lines in twins can be thought to release the stress focus and were beneficial for deformation.

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