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.

Texture of Hot-Rolled Sheet Fe-3% Si Alloy

2017 ◽  
Vol 265 ◽  
pp. 895-899
Author(s):  
S.V. Danilov ◽  
A.A. Redikul'tsev ◽  
Mikhail Lobanov
Keyword(s):  
Central Region ◽  
Hot Rolling ◽  
Electron Backscatter Diffraction ◽  
Surface Region ◽  
Deformation Texture ◽  
Alloy Sheet ◽  
Rolled Sheet ◽  
Recrystallization Process ◽  
Orientation Microscopy ◽  
Hot Rolled

Using the method of orientation microscopy, based on electron backscatter diffraction (EBSD), the texture of Fe–3% Si alloy sheet, produced by hot rolling at 1280 – 920 °C with a total strain exceeding 95 %, was characterized. The texture sheet in the surface region and in the central region consists of a set of stable orientations. The surface region mainly consists of recrystallization orientations; the texture of the central region is formed by a set of deformation orientations. The surface orientations of the sheet are rotated by 90° around the transfer direction relative orientations of the central region. The recrystallization texture components reproduce deformation texture components. Recrystallization replaces texture in the local region. With transverse flow (near the edges) in hot rolling, the stable orientation {112}<110> is formed in the surface region. The recrystallization process does not take place at the edges of the strip.

scholarly journals Grain Refinement by Extension Twin in Mg Alloy during Asymmetrical Rolling

Metals ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 891 ◽  
Author(s):  
I Widiantara ◽  
Hae Yang ◽  
Muhammad Kamil ◽  
Dong Yoon ◽  
Young Ko
Keyword(s):  
Grain Refinement ◽  
Electron Backscatter Diffraction ◽  
Surface Region ◽  
Mg Alloy ◽  
Speed Ratio ◽  
Asymmetrical Rolling ◽  
Present Sample ◽  
Refinement Process ◽  
Backscatter Diffraction

The work looked into the grain refinement process of Mg alloy during asymmetrical rolling with a focus on the role of twin. The present sample was deformed at ambient temperature by single operation with the height reduction of 50% at the roll speed ratio of 1:4 for the upper and lower rolls having the same dimension. From the electron backscatter diffraction analysis in the surface region where intense shear strain was imparted, a number of { 10 1 ¯ 2 } extension twins with a width of ~1 µm were detected clearly in most of the deformed grains. Moreover, the average misorientation angle of the deformed grains in the top region was found to be ~32°, which was two times higher than that in the center area where the extension twin was detected rarely. As a result, the microstructure in the top region was refined significantly down to be ~1.1 µm with an aid of twin activities that would be discussed in this study.

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.

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

2007 ◽  
pp. 89-92
Author(s):  
Shi Hoon Choi ◽  
Y.S. Song ◽  
Jong Kweon Kim ◽  
Hyoung Wook Kim ◽  
Suk Bong Kang
Keyword(s):  
Hot Rolling ◽  
Texture Evolution ◽  
Mg Alloy ◽  
Rolling Deformation

scholarly journals Effect of twinning and Al-Nd phase on dynamic recrystallization in rolled Mg-Al-Zn-Nd alloy at the moderate strain rate

2021 ◽  
Author(s):  
Xiaoming Cui ◽  
Zhengguang Wang ◽  
Zhilei Yu ◽  
Fei Liu ◽  
Xueping Zhao ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Dynamic Recrystallization ◽  
Strain Rate ◽  
Hot Rolling ◽  
Electron Backscatter Diffraction ◽  
Energy Dispersive Spectrometer ◽  
Strain Rate Range ◽  
Nucleation Effect ◽  
Backscatter Diffraction ◽  
Rolling Deformation

Abstract The dynamic recrystallization of Mg-Al-Zn-Nd alloy during moderate strain rate rolling was studied using electron backscatter diffraction (EBSD) and an energy dispersive spectrometer (EDS). The results showed three kinds of twinnings produced in the alloy in the strain rate range of 4.2 s-1 ~ 7.3 s-1, including {101 ̅2} extension twinning, {101 ̅1} contraction twinning, and {101 ̅1}-{101 ̅2} double twinning. The extension twinnings decreased gradually with the increase of strain rate. The dynamic recrystallization mechanisms during hot rolling under moderate strain rate conditions mainly include grain boundary nucleation, twinning nucleation, and secondary particle assistant nucleation. The dynamic recrystallization mechanism induced by twinning is mainly {101 ̅1}-{101 ̅2} double twinnings. In addition, the strain value near the Al-Nd phase and grain boundary is higher than in grain. The Al-Nd particles in Mg-Al-Zn-Nd alloy play an auxiliary nucleation effect on dynamic recrystallization during hot rolling deformation.

Simulation of Texture Evolution during Hot Rolling Deformation in FCC Materials

2007 ◽  
Vol 345-346 ◽  
pp. 869-872 ◽  
Author(s):  
Shi Hoon Choi ◽  
Y.S. Song ◽  
B.J. Kim ◽  
Hyoung Wook Kim ◽  
Suk Bong Kang
Keyword(s):  
Hot Rolling ◽  
Texture Evolution ◽  
Rolling Texture ◽  
Fe Analysis ◽  
Self Consistent ◽  
Octahedral Slip ◽  
Fcc Materials ◽  
Hot Rolled ◽  
Rolling Deformation ◽  
Deformation Gradients

The evolution of hot rolling texture in FCC materials has been simulated numerically using a visco-plastic self-consistent (VPSC) polycrystal model. A finite element (FE) analysis with ABAQUS/StandardTM was conducted to evaluate the deformation gradients during hot rolling deformation. In order to capture crystallographic rotation during hot rolling deformation, an octahedral slip system was considered in a microscopic hardening model. The FE analysis with the VPSC polycrystal simulations successfully predicted the inhomogeneous texture development through the thickness direction in the hot-rolled Al-5wt%Mg alloy sheets.

Physical Based Microstructure Modelling Coupled with Nucleation Theory during and after Hot Forming of AA5083

2010 ◽  
Vol 89-91 ◽  
pp. 509-514
Author(s):  
Pavel Sherstnev ◽  
Christof Sommitsch ◽  
Stefan Mitsche ◽  
Carsten Melzer
Keyword(s):  
Aluminium Alloy ◽  
Hot Rolling ◽  
Volume Fraction ◽  
Electron Backscatter Diffraction ◽  
Grain Structure ◽  
Nucleation Theory ◽  
Structure Evolution ◽  
Nucleation Sites ◽  
Nucleation Mechanisms ◽  
Backscatter Diffraction

A physical model based on three types of dislocations and three nucleation sites for recrystallized grain is applied to hot rolling simulation. This model was implemented into a commercial Finite Element (FE) analysis package FORGE 2008 to calculate both the structure evolution during and the recrystallized volume fraction after hot working of aluminium alloy 5083. It is shown that the main nucleation mechanisms in the aluminium alloy are the particle stimulated nucleation (PSN) and nucleation at grain boundaries. Hence the precipitation kinetics during homogenisation was investigated by use of the thermodynamic calculation software MatCalc. To validate the simulation results hot rolling experiments were performed by means of a laboratory mill. The grain structure evolution was analysed by electron backscatter diffraction (EBSD).

Texture and Microstructure Evolution in Friction Stir Welded Cu-Al Sheets Characterized by EBSD

2011 ◽  
Vol 702-703 ◽  
pp. 574-577 ◽  
Author(s):  
Daniel Goran ◽  
G. Ji ◽  
M. N. Avettand-Fènoël ◽  
R. Taillard
Keyword(s):  
Microstructure Evolution ◽  
Electron Backscatter Diffraction ◽  
Texture Evolution ◽  
Weld Interface ◽  
Friction Stir ◽  
Electron Backscatter ◽  
Ebsd Technique ◽  
Backscatter Diffraction

Texture and microstructure of FSW joined Al and Cu sheets were investigated by means of electron backscatter diffraction (EBSD) technique. The analysis has revealed a strong texture evolution on both sides of the weld interface as well as a very complex microstructure. Grains were found to be fully recrystallized on both sides of the weld and with different average diameters at different specific zones of the weld.

Deformation Structures in a Duplex Stainless Steel

2018 ◽  
Vol 941 ◽  
pp. 176-181 ◽  
Author(s):  
Karin Yvell ◽  
Göran Engberg
Keyword(s):  
Electron Backscatter Diffraction ◽  
Texture Evolution ◽  
True Strain ◽  
Strain Curve ◽  
Tensile Tests ◽  
Uniaxial Tensile ◽  
Deformation Structure ◽  
Pole Figures ◽  
Two Phases ◽  
Backscatter Diffraction

The evolution of the deformation structure with strain has been studied using electron backscatter diffraction (EBSD). Samples from interrupted uniaxial tensile tests and from a cyclic tension/compression test were investigated. The evolution of low angle boundaries (LABs) was studied using boundary maps and by measuring the LAB density. From calculations of local misorientations, smaller orientation changes in the substructure can be illustrated. The different orientations developed with strain within a grain, due to operation of different slip systems in different parts of the grain, were studied using a misorientation profile showing substantial orientation changes after a true strain of 0.24. The texture evolution with increasing strain was followed by using inverse pole figures (IPFs). The observed substructure development in the ferritic and austenitic phases could be successfully correlated with the stress-strain curve from a tensile test. LABs were first observed in the different phases when the strain hardening rate changed in appearance indicating that cross slip started to operate as a significant dislocation recovery mechanism. The evolution of the deformation structure is concluded to occur in a similar manner in the austenitic and ferritic phases but with different texture evolution for the two phases.

scholarly journals Microstructure and Texture Evolutions During Deep Drawing of Mg–Al–Mn Sheets at Elevated Temperatures

Materials ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 3608 ◽  
Author(s):  
Jae-Hyung Cho ◽  
Sang-Ho Han ◽  
Geon Young Lee
Keyword(s):  
Dynamic Recrystallization ◽  
Deep Drawing ◽  
Elevated Temperatures ◽  
Tensile Deformation ◽  
Electron Backscatter Diffraction ◽  
Texture Evolution ◽  
Grain Structure ◽  
Transmission Electron ◽  
Backscatter Diffraction ◽  
Twin Roll

Texture and microstructure evolution of ingot and twin-roll casted Mg–Al–Mn magnesium sheets were examined during deep drawing at elevated temperatures. The twin-roll casted sheets possessed smaller grain sizes and weaker basal intensity levels than the ingot-casted sheets. The strength and elongation at room temperature for the twin-roll casted sheets were greater than those of the ingot-casted sheets. At elevated temperatures, the ingot-casted sheets showed better elongation than the twin-roll casted sheets. Different size and density of precipitates were examined using transmission electron microscopy (TEM) for both ingot-casted and twin-roll-casted sheets. The deep drawing process was also carried out at various working temperatures and deformation rates, 225 °C to 350 °C and 30 mm/min to 50 mm/min, respectively. The middle wall part of cups were mainly tensile deformation, and the lower bent regions of drawn cups were most thinned region. Overall, the ingot-casted sheets revealed better deep drawability than the twin-roll casted sheets. Microstructure and texture evolution of the top, middle and lower parts of drawn cups were investigated using electron backscatter diffraction. Increased deformation rate is important to activate tensile twins both near the bent and flange areas. Ingot casted sheets revealed more tensile twins than twin-roll casted sheets. Increased working temperature is important to activate non-basal slips and produce the DRXed grain structure in the flange. Dynamic recrystallization were frequently found in the top flanges of the cups. Both tensile twins and non-basal slips contributed to occurrence of the dynamic recrystallization in the flange.

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