Crystallographic fabric development along a folded polycrystalline hematite

Morales, Luiz F. G.; Lagoeiro, Leonardo Evangelista; Endo, Issamu

doi:10.1016/j.jsg.2008.05.004

Cited by 14 publications

(12 citation statements)

References 25 publications

(33 reference statements)

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“…The microstructure and crystallographic preferred orientation of banded iron ores of different deposits from Brazil was objective of numerous recent publications, e.g. Rosière et al [3] ; Bascou et al [4] ; Morales et al [5] . The ores reveal a wide range in grain size and shape.…”

Section: Deformed Mainly By Grain Boundary Sliding Accompanied By Dismentioning

confidence: 99%

“…Poles of prism planes are aligned on great circles with a maximum centered on the lineation. The intensity of CPO, characterized by the maximum density of the cpole figure or texture index J (Bunge [6] ; Hielscher et al [7] ) varies with the deformation history (Quade et al [8] ; Rosière et al [3] ), depending on metamorphic temperature (~400-600°C) and increasing strain from west to east in Quadrilátero Ferrífero (Rosière et al [9] ), and on local intensity of shearing and folding (Morales et al [5] ).…”

Section: Deformed Mainly By Grain Boundary Sliding Accompanied By Dismentioning

confidence: 99%

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Development of Microstructure and Texture of Hematite Ores Deformed to Large Strain in Torsion: Can Texture Identify the Prevailing Strength and Creep Mechanisms During Deformation?

et al. 2010

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Samples of fine‐grained (approximately 9 µm) and coarse‐grained (approximately 45 µm) hematite ores with almost random crystallographic preferred orientation (CPO) were deformed in high pressure, high temperature (400 MPa, 850–1 000 °C) torsion experiments up to shear strains of 4.7. Samples with large initial grain size, preferably deformed by dislocation creep attended by dynamic recrystallization, showed grain size reduction and a weak CPO (J ∼ 1.4 at 950 °C). In contrast, fine‐grained ores, deformed mainly by grain boundary sliding accompanied by dislocation activity with slip on the dominant basal glide system, showed grain growth and a strong CPO (J ∼ 2.9). At high strain both ores attained similar strength and grain size, but different CPOs. The experiments demonstrate that the texture intensity of highly deformed rocks strongly depends on initial microstructure and may not reflect unambiguously the prevailing deformation mechanism and strength as often assumed in field studies.

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Section: Deformed Mainly By Grain Boundary Sliding Accompanied By Dismentioning

confidence: 99%

Section: Deformed Mainly By Grain Boundary Sliding Accompanied By Dismentioning

confidence: 99%

Development of Microstructure and Texture of Hematite Ores Deformed to Large Strain in Torsion: Can Texture Identify the Prevailing Strength and Creep Mechanisms During Deformation?

et al. 2010

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“…2e) are more often observed in the high-strain domains of the QF, particularly in the eastern domain. Hematite grains in these rocks show a strong shape and crystallographic preferred orientation (Morales et al 2008). …”

Section: Mineralogy and Petrographymentioning

confidence: 97%

Geochemistry of hematitite and itabirite, Quadrilátero Ferrífero, Brazil

Selmi

Lagoeiro

Endo

2009

Rem: Rev. Esc. Minas

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“…Analysis of the microtexture in oxide phases and their orientation relationship (OR) is generally conducted via EBSD [32][33][34][35][36][37][38]. Cubic Fe 3 O 4 and wustite (Fe 1-x O, 1-x=0.83-0.95) share a strong <100> texture and a cube-cube OR in undeformed oxide scale formed on whatever the steel substrate [16,32].…”

Section: Introductionmentioning

confidence: 99%

“…In contrast, the deformed Fe 1-x O develops a pronounced <100> fibre component using plane strain compression [33,36]. In view of texture analysis of iron oxides in the geography field [37,38], ambiguities remain what kind of microtexture in deformed Fe 3 O 4 and α-Fe 2 O 3 will be developed during hot rolling, and what its evolution will be. Also, few work on the grain boundary effect leads to the change of tribological properties with the polycrystalline tungsten or copper [1,13,25], but often uncorrelated.…”

Section: Introductionmentioning

confidence: 99%

Effects of grain boundaries in oxide scale on tribological properties of nanoparticles lubrication

Jiang

Zhao

et al. 2015

Wear

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The characters of grain boundaries in oxide layers formed on substrates influence adhesion and friction behaviour, surface fracture and wear during high temperature steel processing. In this work, an electron backscattered diffraction (EBSD) analysis was conducted to investigate the role of surface grain boundary and orientation in magnetite (Fe 3 O 4 )/haematite (α-Fe 2 O 3 ) scale during hot rolling, and further evaluate their effects on tribological properties of water-based nanoparticles lubrication. The results demonstrate that Fe 3 O 4 (100) plane is strongly sensitive to the surface characteristics as the minimisation of surface energy. Coincident site lattice (CSL) boundaries in microstructure is in presence of Σ3 in the Fe 3 O 4 and Σ13b in the Fe 2 O 3 of the substrates subjected to a thickness reduction of 28% and cooling rate of 28 ° C/s. This is due in great part to the changes in crystal slip systems. These low-Σ CSL boundaries in oxide scale offer obstacles to the propagation of cracks, where some of nanoparticles collected would be trapped at the interface and thereby may cause high wear rates. A lubrication mechanism is proposed to explain the grain boundary effect on nanoparticles lubrication, and further to determine the dependence of frictional behaviour on surface energy, crystallographic preferred orientation (microtexture) and crystal structure. These results provide an intriguing new insight into the application of water-based lubricant with graphite nanoparticles. AbstractThe characters of grain boundaries in oxide layers formed on substrates influence adhesion and friction behaviour, surface fracture and wear during high temperature steel processing. In this work, a thickness reduction of 28% and cooling rate of 28 °C/s. This is due in great part to the changes in crystal slip systems. These low-Σ CSL boundaries in oxide scale offer obstacles to the propagation of cracks, where some of nanoparticles collected would be trapped at the interface and thereby may cause high wear rates. A lubrication mechanism is proposed to explain the grain boundary effect on nanoparticles lubrication, and further to determine the dependence of frictional behaviour on surface energy, crystallographic preferred orientation (microtexture) and crystal structure. These results provide an intriguing new insight into the application of water-based lubricant with graphite nanoparticles.

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Crystallographic fabric development along a folded polycrystalline hematite

Cited by 14 publications

References 25 publications

Development of Microstructure and Texture of Hematite Ores Deformed to Large Strain in Torsion: Can Texture Identify the Prevailing Strength and Creep Mechanisms During Deformation?

Development of Microstructure and Texture of Hematite Ores Deformed to Large Strain in Torsion: Can Texture Identify the Prevailing Strength and Creep Mechanisms During Deformation?

Geochemistry of hematitite and itabirite, Quadrilátero Ferrífero, Brazil

Effects of grain boundaries in oxide scale on tribological properties of nanoparticles lubrication

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