Grain detection from 2d and 3d EBSD data—Specification of the MTEX algorithm

Bachmann, Florian; Hielscher, Ralf; Schaeben, Helmut

doi:10.1016/j.ultramic.2011.08.002

Cited by 576 publications

(281 citation statements)

References 14 publications

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“…Crystallite/grain recognition in the orientation maps with an extended version of Mtex 3.4.2 [22]. The chosen disorientation between neighbors for the recognition was 5°.…”

Section: Methodsmentioning

confidence: 99%

Fatigue Behavior of Ultrafine-Grained Medium Carbon Steel with Different Carbide Morphologies Processed by High Pressure Torsion

Ruffing

Kobler

Courtois-Manara

et al. 2015

Metals

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Abstract:The increased attention ultrafine grained (UFG) materials have received over the last decade has been inspired by their high strength in combination with a remarkable ductility, which is a promising combination for good fatigue properties. In this paper, we focus on the effect of different carbide morphologies in the initial microstructure on the fatigue behavior after high pressure torsion (HPT) treatment of SAE 1045 steels. The two initial carbide morphologies are spheroidized as well as tempered states. The HPT processing increased the hardness of the spheroidized and tempered states from 169 HV and 388 HV to a maximum of 511 HV and 758 HV, respectively. The endurance limit increased linearly with hardness up to about 500 HV independent of the carbide morphology. The fracture surfaces revealed mostly flat fatigue fracture surfaces with crack initiation at the surface or, more often, at non-metallic inclusions. Morphology and crack OPEN ACCESSMetals 2015, 5 892 initiation mechanisms were changed by the severe plastic deformation. The residual fracture surface of specimens with spheroidal initial microstructures showed well-defined dimple structures also after HPT at high fatigue limits and high hardness values. In contrast, the specimens with a tempered initial microstructure showed rather brittle and rough residual fracture surfaces after HPT.

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“…Crystallite/grain recognition in the orientation maps with an extended version of Mtex 3.4.2 [22]. The chosen disorientation between neighbors for the recognition was 5°.…”

Section: Methodsmentioning

confidence: 99%

Fatigue Behavior of Ultrafine-Grained Medium Carbon Steel with Different Carbide Morphologies Processed by High Pressure Torsion

Ruffing

Kobler

Courtois-Manara

et al. 2015

Metals

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“…In some cases, electron backscatter diffraction (EBSD) patterns from the samples were also acquired using a JSM-6300 scanning electron microscope. The images from the EBSD patterns were reconstructed using the MTex v3.2.5 data analysis software [9]. The applied criterion for discriminating the grain boundaries was a crystallographic misorientation >5 • between adjacent crystalline domains.…”

Section: Methodsmentioning

confidence: 99%

Thermal stability of the grain structure in the W-2V and W-2V-0.5Y2O3 alloys produced by hot isostatic pressing

Martínez

Savoini

Monge

et al. 2013

Fusion Engineering and Design

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Highlights:-W-2V and ODS W-2V-0.5Y 2 O 3 alloys have been produced following a powder metallurgy route.-Grain microstructure and microhardness have been studied after isothermal treatments in vacuum.-Both alloys exhibit a duplex grain size population: a submicron-sized grain and a coarse grained one. Keywords: W alloys, Oxide dispersion strengthened W alloys, Grain growth, Recovery, Microhardness Abstract: W-2V and ODS W-2V-0.5Y 2 O 3 alloys have been produced following a powder metallurgy route consisting of mechanical alloying and a subsequent high isostatic pressing HIP at 1573 K. The grain microstruc-ture and microhardness recovery of the alloys have been studied in samples subjected to isothermal treatments in vacuum in temperature range 1073-1973 K. Both alloys exhibit a duplex grain size distri-bution consisting of a submicron-sized grain and a coarse-grained population. It has been found that the Y 2 O 3 addition inhibits growth of the coarse grains at T < 1973 K. Submicron grain growth, with activa-tion enthalpy of 1.9 and 2.49 eV for W-2V and W-2V-0.5Y 2 O 3 , respectively, was observed at T ≥ 1573 K. It resulted that the rate constant for grain growth is 30 times higher in W-2V-0.5Y 2 O 3 than in W-2V. The considerable enhancement of the microhardness in the W-2V-0.5Y 2 O 3 appears to be associated to dispersion strengthening.

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“…The data are usually shown for the whole mapped area of zircon grain if subareas of interest are not specifically indicated. The first mode of maps and pole figures was produced using the EDAX OIM Analysis v6.2.1 software, whereas the second mode of misorientation maps (local misorientation maps) was generated with the MTEX toolbox for MATLAB (Bachmann et al, 2010(Bachmann et al, , 2011Mainprice et al, 2011). We used MTEX toolbox for plotting histograms of misorientation angles between data points as well as for visualizing the misorientation axis orientation and density contours in inverse pole figures.…”

Section: Electron Backscatter Diffraction (Ebsd) Analysis and Forwardmentioning

confidence: 99%

Finite lattice distortion patterns in plastically deformed zircon grains

et al. 2014

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Abstract. This study examines finite deformation patterns of zircon grains from high-temperature natural shear zones. Various zircon-bearing rocks were collected in the Western Tauern Window, eastern Alps, where they were deformed under amphibolite facies conditions, and in the Ivrea-Verbano Zone (IVZ), southern Alps, where deformation is related with granulite-facies metamorphism. Among the sampled rocks are granitic orthogneisses, metalamprophyres and paragneisses, all of which are strongly deformed.The investigated zircon grains ranging from 10 to 50 µm were studied in situ using a combination of scanning electron microscope (SEM) techniques, backscattered electron (BSE) imaging, forward-scattered electron (FSE) imaging, cathodoluminescence (CL) imaging, and crystallographic orientation mapping by electron backscatter diffraction (EBSD), as well as micro-Raman spectroscopy. Energy-dispersive X-ray spectrometry (EDS) was applied to host phases.Microstructural analysis of crystal-plastically deformed zircon grains was based on high-resolution EBSD maps. Three general types of finite lattice distortion patterns were detected: type (I) is defined by gradual bending of the zircon lattice with orientation changes of about 0.6-1.8 • per micrometer without subgrain boundary formation. Cumulative grain-internal orientation variations range from 7 to 25 • within single grains. Type (II) represents local gradual bending of the crystal lattice accompanied by the formation of subgrain boundaries that have concentric semicircular shapes in 2-D sections. Cumulative grain-internal orientation variations range from 15 to 40 • within single grains. Type (III) is characterized by formation of subgrains separated by a welldefined subgrain boundary network, where subgrain boundaries show a characteristic angular closed contour. The cumulative orientation variation within a single grain ranges from 3 to 10 • . Types (I) and (II) predominate in granulite facies rocks, whereas type (III) is restricted to the amphibolite facies rocks. The difference in distortion patterns is controlled by strain rate and by ratio between dislocation formation and dislocation motion rates, conditioned by the amount of differential stress.Investigated microstructures demonstrate that misorientation axes are usually parallel to the < 001 > and < 100 > crystallographic directions; dominant slips are < 010 > { 001 }, < 010 > { 100 } and < 001 > { 010 }, whereas in some grains cross-slip takes place. This study demonstrates that activation of energetically preferable slip systems is facilitated if zircon grain is decoupled from the host matrix and/or hosted by a soft phase.

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Grain detection from 2d and 3d EBSD data—Specification of the MTEX algorithm

Cited by 576 publications

References 14 publications

Fatigue Behavior of Ultrafine-Grained Medium Carbon Steel with Different Carbide Morphologies Processed by High Pressure Torsion

Fatigue Behavior of Ultrafine-Grained Medium Carbon Steel with Different Carbide Morphologies Processed by High Pressure Torsion

Thermal stability of the grain structure in the W-2V and W-2V-0.5Y2O3 alloys produced by hot isostatic pressing

Finite lattice distortion patterns in plastically deformed zircon grains

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