An EBSD Study on Orientation Effects during Recrystallization of Coarse-Grained Niobium

The recrystallization behavior of coarse-grained niobium depends on the nature of its deformation microstructure. In this regard, a longitudinal section of a high-purity coarse-grained niobium ingot was cold rolled to a thickness reduction of 96% followed by annealing in vacuum at 800°C for 1 h. Metallographic inspection in cold-rolled and annealed specimens was carried out in a field emission gun scanning electron microscope (FEG-SEM). Microtexture was determined by electron-backscattered diffraction (EBSD) coupled to the FEG-SEM. The use this technique has evidenced details of the boundary character and subgrain structure found in partially recrystallized regions. The early stages of primary recrystallization are associated to the presence of high-angle lamellar boundaries found in the cold-worked state. Abnormal subgrain growth has been evidenced as a viable mechanism for nucleation of recrystallization.

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In-Grain and Grain-to-Grain Textural Inhomogeneities in Coarse-Grained Tantalum

Materials Science Forum ◽

10.4028/www.scientific.net/msf.467-470.507 ◽

2004 ◽

Vol 467-470 ◽

pp. 507-512

Author(s):

Hugo Ricardo Zschommler Sandim ◽

J.P. Martins ◽

Andre Luiz Pinto ◽

Angelo Fernando Padilha

Keyword(s):

Microstructural Characterization ◽

Longitudinal Section ◽

Rolling Plane ◽

Coarse Grained ◽

Large Strains ◽

Electron Backscattered Diffraction ◽

High Annealing ◽

Growth Selection ◽

Cold Rolled ◽

Individual Grains

The recrystallization behavior of coarse-grained tantalum deformed at large strains is strongly dependent on its deformation microstructure. In this regard, a longitudinal section of a high-purity coarse-grained tantalum ingot obtained by double electron beam melting (EBM) was rolled at room temperature to thickness reductions varying from 70 to 92% followed by annealing in vacuum at 900 and 1200°C for 1 h. Microstructural characterization was performed in cold-rolled and annealed specimens using scanning electron microscopy (SEM) in the backscattered mode (BSE), electron backscattered diffraction (EBSD), and microhardness testing. Results show that recrystallization of individual grains is strongly dependent on the initial orientation. In consequence, recrystallization kinetics varies noticeably from one grain to another. Inhomogeneous in-grain and grain-to-grain spatial distributions of textures are found in the tantalum plates. Texture components belonging to the so-called g fiber ({111}// ND) are in majority in the rolling plane. The presence of tiny recovered regions in the annealed plate is associated to stable orientations like rotated cube {001}<110>, which are very resistant to recrystallization even at high annealing temperatures. EBSD results also confirm the occurrence of growth selection during recrystallization in coarsegrained tantalum.

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Cold Rolled Microstructure and Its Evolution during Recovery and First Recrystallisation Stages in Low Carbon Steels

Materials Science Forum ◽

10.4028/www.scientific.net/msf.467-470.241 ◽

2004 ◽

Vol 467-470 ◽

pp. 241-246 ◽

Cited By ~ 2

Author(s):

M. Díaz-Fuentes ◽

E. Novillo ◽

Amaia Iza-Mendia ◽

Isabel Gutiérrez

Keyword(s):

Deformation Texture ◽

Carbon Steels ◽

Subgrain Structure ◽

Processing Conditions ◽

Low Carbon ◽

Electron Backscattered Diffraction ◽

Steel Sheets ◽

Deformation Banding ◽

Different Temperatures ◽

Cold Rolled

During annealing of cold rolled steel sheets, the evolution of the texture, to produce the characteristic texture of a recrystallised material, depends on a series of factors, including the starting deformation texture, composition and processing conditions. In the present work, electron backscattered diffraction (EBSD) techniques have been used to investigate the deformation substructures being developed by cold rolling into grains belonging to different texture components. The strain localisation, the deformation banding, the spread in orientation into grains with different orientations are some of the aspects that have been considered. Annealing cycles at different temperatures have also been carried out in order to promote recovery and initial stages of recrystallisation . The obtained substructures have been compared to the as-cold rolled ones. It has been observed that recovery induces the dislocation structures to arrange into subgrains. Associated to the ND fibre, a network of relatively high angle boundaries develop within the subgrain structure. The recrystallisation nuclei have been observed to evolve from such a network.

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Effect of Deformed Microstructure on Primary Recrystallization Behavior in Cold Rolled Cu-added Extra Low Carbon Steel

Korean Journal of Metals and Materials ◽

10.3365/kjmm.2014.52.5.361 ◽

2014 ◽

Vol 52 (5) ◽

pp. 361-372 ◽

Cited By ~ 2

Author(s):

Jong Seok Kim ◽

Sung Il Kim ◽

Shi Hoon Choi

Keyword(s):

Carbon Steel ◽

Low Carbon Steel ◽

Primary Recrystallization ◽

Recrystallization Behavior ◽

Low Carbon ◽

Cold Rolled

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An electron-backscattered diffraction study of the texture evolution in a coarse-grained AZ31 magnesium alloy deformed in tension at elevated temperatures

Metallurgical and Materials Transactions A ◽

10.1007/s11661-006-0147-2 ◽

2006 ◽

Vol 37 (1) ◽

pp. 7-17 ◽

Cited By ~ 28

Author(s):

Yi Liu ◽

Xin Wu

Keyword(s):

Magnesium Alloy ◽

Diffraction Study ◽

Elevated Temperatures ◽

Texture Evolution ◽

Az31 Magnesium Alloy ◽

Coarse Grained ◽

Electron Backscattered Diffraction

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Microstructure and Microhardness of Copper Subjected to High Pressure Torsion

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.194-196.712 ◽

2011 ◽

Vol 194-196 ◽

pp. 712-715 ◽

Cited By ~ 1

Author(s):

Zi Ling Xie ◽

Lin Zhu Sun ◽

Fang Yang ◽

Xiao Bing Li

Keyword(s):

High Pressure ◽

High Pressure Torsion ◽

Type Equation ◽

Longitudinal Section ◽

Dislocation Cell ◽

Subgrain Structure ◽

Structure Morphology ◽

Evolution Of Microstructure ◽

Equiaxed Grains ◽

Variation Tendency

Experiments were conducted on copper subjected to High Pressure Torsion to investigate the evolution of microstructure and microhardness with shear strain, γ. Observations have been carried out in the longitudinal section for a proper demonstration of the structure morphology. An elongated dislocation cell/subgrain structure was observed at relatively low strain level. With increasing strain, the elongated subgrains transformed into elongated grains and finally into equiaxed grains with high angle grain boundaries. Measurements showed the hardness increases with increasing γ then tends to saturations when γ >5. The variation tendency of microhardness with γ can be simulated by Voce-type equation.

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Effect of Deformation on the Corrosion Behavior of Chromium Bronze

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.303-306.2465 ◽

2013 ◽

Vol 303-306 ◽

pp. 2465-2468

Author(s):

Ya Ni Zhang ◽

Dang Hui Wang ◽

Tian Han Xu

Keyword(s):

Corrosion Resistance ◽

Mass Loss ◽

Corrosion Behavior ◽

Initial Stage ◽

Corrosion Scales ◽

Rolled Specimen ◽

Cold Rolled ◽

Chromium Bronze ◽

Cold Worked ◽

Cold Rolled Specimen

The service life of material is much related with its corrosion resistance. Thus, the investigation on corrosion behavior is important for the better use of material. In this paper, the corrosion behavior of deformed chromium bronze experienced different processing was investigated in NaCl environment using electrochemical measurements and mass-loss tests. It has showed that the potentiodynamic polarization curves of cold rolled specimen coincide with that of cold worked specimen in two concentration of NaCl solution. The last cold working has little effect on the electrochemical behavior of cold rolled chromium bronze.The NaCl fog experiment showed that the corrosion resistance of cold rolled specimen is slightly better than that of cold worked specimen, and the mass-loss for two kinds of specimen are similar in the initial stage but the gap is increasing with corrosion time. The corrosion scales on the surface of specimen, accumulated in the form of island produced in the NaCl fog experiment , has little hindered effect on corrosion behavior.

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Recrystallization of Cold-Rolled Zr Single Crystals

Materials Science Forum ◽

10.4028/www.scientific.net/msf.753.275 ◽

2013 ◽

Vol 753 ◽

pp. 275-278 ◽

Cited By ~ 2

Author(s):

Margarita Isaenkova ◽

Yuriy Perlovich ◽

Nikolay Krapivka ◽

Vladimir Fesenko ◽

Olga Krymskaya ◽

...

Keyword(s):

Single Crystals ◽

Line Profile ◽

Coarse Grained ◽

X Ray ◽

Commercially Pure ◽

Cold Rolled ◽

Ray Methods

Recrystallization of rolled Zr single crystals is considered in comparison with analogous recrystallization processes in rolled coarse-grained iodide Zr and polycrystalline plates of commercially pure Zr. Diffractometric X-ray methods were used by texture and X-ray line profile measurements. The treatment of obtained data included construction of correlation diagrams, connecting as-rolled and recrystallized conditions of samples. A number of recrystallization mechanisms, operating in rolled α-Zr under annealing, were revealed on the basis of found regularities of texture changes.

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