scholarly journals Methodology for the Identification of Nucleation Sites in Aluminum Alloy by Use of Misorientatation Mapping

2021 ◽  
Vol 3 (1) ◽  
pp. 11
Author(s):  
Sofia Papadopoulou ◽  
Evangelos Gavalas ◽  
Spyros Papaefthymiou
Keyword(s):  
Mechanical Properties ◽  
Texture Evolution ◽  
Electron Back Scatter Diffraction ◽  
Point Of View ◽  
Recrystallization Process ◽  
Kernel Average Misorientation ◽  
Nucleation Sites ◽  
Cold Rolled ◽  
Local Plastic Deformation ◽  
Misorientation Angles

The fabrication of semi-finished hot and cold rolled sheets includes a complex evolution of both microstructure and texture to meet the demanded mechanical properties and suitable formability characteristics. The desired mechanical properties along with the optimum grain size can be obtained through the control of both recovery and recrystallization processes. This work examines the effect of recovery and recrystallization on the resulting crystallographic texture and on the local plastic deformation. A processing approach for EBSD-KAM (Electron Back Scatter Diffraction—Kernel average misorientation) evaluation is suggested with the purpose of effectively evaluating all the possible misorientation angles in-between the grains and of observing the recovery phenomenon from a different point of view. The results showed that although texture components did not alternate significantly during recovery, the fraction of sub-grain boundaries was increased indicating the completion of recovery at the selected temperature exhibited a maximum value of 90%. The initiation of recrystallization was illustrated by a different aspect, underlying newly formed grains and points which exhibited high misorientation angle, critical for the evolution of the recrystallization process and texture evolution.

scholarly journals The Effects of Reduction and Thermal Treatment on the Recrystallization and Crystallographic Texture Evolution of 5182 Aluminum Alloy

Metals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1380
Author(s):  
Sofia Papadopoulou ◽  
Athina Kontopoulou ◽  
Evangelos Gavalas ◽  
Spyros Papaefthymiou
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Thermal Treatment ◽  
Rolled Product ◽  
Crystallographic Texture ◽  
Texture Evolution ◽  
Fiber Texture ◽  
Electron Back Scatter Diffraction ◽  
Cold Rolled ◽  
Hot Rolled

During forming, thickness reduction and thermal treatment affect the recrystallization and evolution of the crystallographic texture of metallic materials. The present study focuses on the consequences of rolling reduction of a widespread aluminum alloy with numerous automotive, marine and general-purpose applications, namely Al 5182. Emphasis is laid on the crystallographic texture and mechanical properties on both hot and cold-rolled semi-final products. In particular, a 2.8 mm-thick hot-rolled product was examined in the as-received condition, while two cold-rolled sheets, one 1.33 mm and the other 0.214 mm thick, both originating from the 2.8 mm material, were examined in both as-received and annealed (350 °C for 1 h) conditions. Electron back-scatter diffraction indicated the presence of a large percentage of random texture as well as a weak recrystallization texture for the hot-rolled product, whereas in the case of cold rolling the evolution of β-fiber texture was noted. In addition, tensile tests showed that both the anisotropy as well as the mechanical properties of the cold-rolled properties improved after annealing, being comparable to hot-rolled ones.

Effect of Rolling Process on Microstructure and Texture of Cold Rolled Ti-6Al-4V Seamless Tubes

2012 ◽  
Vol 557-559 ◽  
pp. 191-197 ◽  
Author(s):  
Yun Xue Jin ◽  
Kai Yue Li ◽  
Hong Mei Chen ◽  
Hong Fu Xiang
Keyword(s):  
Mechanical Properties ◽  
Deformation Rate ◽  
Texture Evolution ◽  
Rolling Process ◽  
Air Cooling ◽  
Final Size ◽  
Heat Treatment Parameter ◽  
Stress Relieving ◽  
Treatment Parameter ◽  
Cold Rolled

In this paper, initial Ti-6Al-4V seamless tube was prepared and cold rolled to a final size of 32*2, and the microstructure and mechanical properties development was investigated, and the (0002) and (10 -10) texture was measured on XRD, pole figure calculated by Microsoft of Labotex. Pass between annealing was taken for stress-relieving, heat-treatment parameter was 800°C-1hr, furnace cooling to 500°C and then air cooling to room temperature. The results show that rolling process result in effective grain refinement and mechanical properties improvement after several rolling passes. The increase number of rolling pass improves strength but reduce the elongation, annealing improve elongation, reduce strength. A trend of texture reorientation was found in this paper also, textures of materials rolled by deformation rate were compared, different deformation rate effect texture evolution has been proved.

Monte Carlo Modelling of Recrystallization Process in Cold Rolled IF-Ti Steel

2004 ◽  
Vol 467-470 ◽  
pp. 665-670
Author(s):  
Amel Samet-Meziou ◽  
Ph. Gerber ◽  
Jacek Tarasiuk ◽  
Thierry Baudin ◽  
Richard Penelle
Keyword(s):  
Monte Carlo ◽  
Texture Evolution ◽  
Recrystallization Process ◽  
Stored Energy ◽  
Nucleation Mechanisms ◽  
Deformation Amount ◽  
Complete Set ◽  
High Reduction ◽  
Cold Rolled ◽  
Electron Back Scattered Diffraction

Recently, some authors have used the Monte Carlo modelling using complete set of experimental data to get a better correlation between experimental observations and calculations concerning recrystallization process [1, 2]. Simulations using Monte Carlo technique have been performed these last years for IF-Ti steels in order to predict the microstructure and the texture evolution after high reduction amounts by cold rolling [3, 4]. On the contrary, in the present work, this evolution is simulated in an IF-Ti steel cold rolled after low deformation amount (reduction amount R = 40 %). Microstructure is characterized by Electron Back-Scattered Diffraction and introduced in the model. The quality index of the Kikuchi patterns (EBSD data) is used to qualitatively evaluate the stored energy for each grain. Different hypothesis of nucleation mechanisms have been introduced into the model. It has been shown that the better recrystallization texture correlation between experiment and simulation is obtained by taking into account the nucleation in the low stored energy sites and highly misorientation regions. Finally a simulation issue was compared with EBSD and TEM experimental results: microstructure, recrystallization kinetics and Avrami coefficients values.

Microstructure and Mechanical Properties of Titanium Severely Strained by Means of Friction Roll Processing

2007 ◽  
Vol 561-565 ◽  
pp. 909-912 ◽  
Author(s):  
Mei Qin Shi ◽  
Yoshimasa Takayama ◽  
Hajime Kato
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Texture Evolution ◽  
Electron Back Scatter Diffraction ◽  
Subsequent Annealing ◽  
Severe Plastic Deformation Technique ◽  
Before And After ◽  
Feeding Speed ◽  
Scanning Electron

Severe strain has been introduced to commercially purity (CP) titanium samples by means of friction roll processing (FRP), which represents an alternative severe plastic deformation technique by inducing shear strain. FRP has an excellent possibility of controlling surface microstructure combining with subsequent annealing. The resultant microstructure refinement and texture evolution has been investigated. Hardness of sample was measured to compare mechanical properties of samples before and after FRPed. Parameters including the different indentations given to the sample and sample feeding speed were experimentally conducted to find the optimum condition for investigating effect on microstructure evolution. After subsequent annealing, the evolutions of microstructure and texture were observed by field emission scanning electron microscopy (FESEM) and analyzed by scanning electron microscopy/ electron back scatter diffraction pattern (SEM/EBSP) technique. Transverse texture was found to be the preferred orientation existing in the thin top layer of the sample after FRP and annealed at 823K for 1h.

Enhancement of ductility in Mg–3Al–1Zn alloy with tilted basal texture by electropulsing

2009 ◽  
Vol 24 (12) ◽  
pp. 3674-3679 ◽  
Author(s):  
Lei Guan ◽  
Guoyi Tang ◽  
Paul K. Chu ◽  
Yanbin Jiang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Tensile Ductility ◽  
Texture Evolution ◽  
Boundary Motion ◽  
Basal Texture ◽  
Rolled Sample ◽  
Cold Rolled ◽  
Electropulsing Treatment ◽  
Grain Boundary Motion

The microstructure and texture evolution in a cold-rolled AZ31 magnesium alloy during electropulsing treatment (EPT) are investigated and correlated with the mechanical properties. The microstructure is effectively refined, and a tilted basal texture develops gradually during EPT. The yield stress in the treated samples is lower than that in the cold-rolled sample, indicating that texture softening is dominant over strengthening because of grain refinement. The phenomenon is primarily the result of the tilted basal texture. EPT improves the tensile ductility of the EPT samples significantly, albeit slightly compromising the tensile strength. The mechanism of the microstructure evolution during electropulsing is discussed from the viewpoint of grain-boundary motion. Moreover, the ductility enhancement is discussed in terms of the deformation mechanism and texture of the Mg alloy.

Recrystallization Kinetics and Texture Evolution during Annealing of Cold Rolled Fe-Mn-C Alloy

2012 ◽  
Vol 715-716 ◽  
pp. 568-573 ◽  
Author(s):  
Ya Ping Lü ◽  
Dmitri A. Molodov ◽  
Günter Gottstein
Keyword(s):  
Texture Evolution ◽  
Shear Bands ◽  
X Ray Diffraction ◽  
X Ray ◽  
Recrystallization Kinetics ◽  
Nucleation Sites ◽  
Preferential Nucleation ◽  
Cold Rolled ◽  
Mechanical Twins

The recrystallization behavior of 50% cold rolled Fe-22%Mn-0.376%C alloy during annealing at 560°C, 630°C and 700°C was investigated. Microhardness tests were applied for characterization of the recrystallization kinetics, X-ray diffraction and EBSD measurements were utilized to characterize the crystallographic texture and the grain microstructure. The obtained experimental data were evaluated in terms of the JMAK model. The obtained values of the Avrami exponent varied in the range between 0.70 and 1.37. The inhomogeneous grain microstructure after recrystallization is interpreted in terms of non-randomly distributed nuclei. Shear bands, lamellar lines intersecting with mechanical twins and grain boundaries with localized high misorientation gradients were identified to be preferential nucleation sites. No pronounced texture was observed after annealing at 630°C.

Microstructure and Mechanical Properties of Cold-Rolled Mg-6Al-1Zn Alloy Strip Treated by Electropulsing Treatment

2014 ◽  
Vol 789 ◽  
pp. 328-335
Author(s):  
Yan Bin Jiang ◽  
Lei Guan ◽  
Guo Yi Tang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Rolled Strip ◽  
Recrystallization Process ◽  
Alloy Strip ◽  
Microstructure And Mechanical Properties ◽  
Fine Microstructure ◽  
Elongation To Failure ◽  
Cold Rolled ◽  
Electropulsing Treatment

The effect of electropulsing treatment (EPT) on the microstructure and mechanical properties of the cold-rolled Mg-6Al-1Zn alloy strip was investigated. It is found that EPT accelerated the recrystallization behaviour of the cold-rolled Mg-6Al-1Zn alloy strip at a relatively low temperature within a short time of 14 seconds. When the temperature of EPT was 423 K, recovery of Mg matrix happened and few β-Mg17Al12 phaseprecipitated in the Mg matrix. With increasing the temperature to 463 K, recrystallization occurred, accompanying dissolution of β-Mg17Al12 phase. When the temperature was increased to 483 K, complete recrystallization took place and obtained fine microstructure of quasi-single-phase recrystallized grains. The elongation to failurewas increased from the 6.3 % of the rolled strip to 23.5 %, while the tensile strength was decreased from 368 MPa to 300 MPa. Further increasing the temperature of EPT, the apparent grain growth occurred and both the tensile strength and elongation to failure reduced. A mechanism for rapid recrystallization process during EPT was discussed.

Texture Evolution during Recrystallisation of Cold Rolled TWIP Steel

2011 ◽  
Vol 702-703 ◽  
pp. 647-650
Author(s):  
Ahmed A. Saleh ◽  
Elena V. Pereloma ◽  
Azdiar A. Gazder
Keyword(s):  
Cold Rolling ◽  
Twip Steel ◽  
Texture Evolution ◽  
Rolling Texture ◽  
Austenitic Steels ◽  
X Ray Diffraction ◽  
Energy Materials ◽  
X Ray ◽  
Nucleation Sites ◽  
Cold Rolled

A TWinning Induced Plasticity (TWIP) steel was cold rolled to 42% thickness reduction followed by isochronal annealing for 300 s between 600-850 °C. Bulk texture evolution during recrystallisation was investigated by X-Ray Diffraction. While the development of the α-fibre after cold rolling is typical of low stacking fault energy materials, anomalously higher intensities were noted for the Goss ({110}) compared to Brass ({110}) orientations. Upon recrystallisation, the main rolling texture components were retained and ascribed to nucleation at orientations close to those of the deformed matrix followed by annealing twinning which leads to crystallographically identical variants. Unlike previous texture investigations on austenitic steels, the relatively homogeneous deformation microstructure and uniform distribution of subsequent nucleation sites led to the retention of the F ({111}) orientation. Moreover, the firsthand observation of the Rotated Copper ({112}) orientation in TWIP steel is attributed to the second order twinning of the A ({110}) orientation.

Evolution of Cube Texture in Cu-45at.%Ni Alloy Substrates for YBCO Coated Conductors

2015 ◽  
Vol 778 ◽  
pp. 105-109
Author(s):  
Hui Tian ◽  
Yi Wang ◽  
Pan Wang ◽  
Ya Ru Liang ◽  
Lin Ma ◽  
...  
Keyword(s):  
Grain Growth ◽  
Texture Evolution ◽  
Cube Texture ◽  
Rolling Texture ◽  
Coated Conductors ◽  
Recrystallization Process ◽  
Ni Alloy ◽  
Back Scattering ◽  
Cold Rolled ◽  
Ybco Coated Conductors

The cube texture evolution during annealing of the heavy cold-rolled Cu-45at.%Ni alloy tapes were investigated by XRD and electron back scattering diffraction techniques. The results indicated that the fraction of Copper-type rolling texture was slightly strengthened during recovery, and then strongly reduced during recrystallization. The cube texture was formed by consuming the rolling texture components during recrystallization process, and the S, Copper and Brass orientations were consumed together via cube grain growth. A strong cube-textured Cu-45at.%Ni alloy substrate with the cube texture fraction of 98.6 % (< 10°) was obtained after annealing at 1000 oC for 1 h.

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