Automatic twin statistics from electron backscattered diffraction data

Marshall, P.; Proust, Gwénaëlle; Rogers, J.; McCabe, Rodney J.

doi:10.1111/j.1365-2818.2009.03343.x

Cited by 36 publications

(10 citation statements)

References 21 publications

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“…A specimen compressed to 3% strain was sectioned on a plane normal to the compression axis and metallographically prepared for EBSD. Forty-two EBSD scans resulting in the statistics listed in Table 1 were collected in an FEI XL30 FEG-SEM at 20 kV using a 1 mm step size, and the EBSD scans were analyzed using an automated twin characterization method (Marshall et al, 2010). An EBSD orientation map representing one of the forty-two scans is displayed in Fig.…”

Section: Starting Microstructures For the Model Based On Experimentalmentioning

confidence: 99%

Effect of microstructure on the nucleation of deformation twins in polycrystalline high-purity magnesium: A multi-scale modeling study

Beyerlein

McCabe

Tomé

2011

Journal of the Mechanics and Physics of Solids

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301

158

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Section: Starting Microstructures For the Model Based On Experimentalmentioning

confidence: 99%

Effect of microstructure on the nucleation of deformation twins in polycrystalline high-purity magnesium: A multi-scale modeling study

Beyerlein

McCabe

Tomé

2011

Journal of the Mechanics and Physics of Solids

Self Cite

301

158

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“…Scans were taken at 20 kV with a 0.2 lm step size in a hexagonal grid. Twin statistics were analyzed using the OIMe Analysis software and a twin program written at Los Alamos National Laboratory [31,44].…”

Section: Ebsd Characterizationmentioning

confidence: 99%

Strain rate and temperature effects on the selection of primary and secondary slip and twinning systems in HCP Zr

et al. 2015

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We investigate the temperature and rate dependence of slip, twinning, and secondary twinning in high-purity hexagonal close packed a-Zr over a wide range of temperatures and strain rates (from 76 K to 673 K and 0.001 s À1 to 4500 s À1 ). To reliably identify the dominant deformation mechanisms for each condition, we employ electron-backscattered diffraction (EBSD), dislocation theory, multi-scale polycrystal constitutive modeling, and a thermally activated dislocation density evolution based hardening law. We demonstrate with direct comparison with measurement that the constitutive model, with a single set of intrinsic material parameters, can predict the underlying texture evolution, primary and secondary slip and twin activity, and twin volume fraction associated with the different loading orientations and applied temperatures and strain rates. We find that the f1 0 1 2gh1 0 1 1i twin is the preferred tension twin, either as a primary or secondary twin depending on the sample orientation, over the broad temperature and strain rate range tested. In contrast, we show that the preferred contraction twin, whether f1 1 2 2gh1 1 2 3i or f1 0 1 1gh1 0 1 2i, is sensitive to temperature but insensitive to strain rate and whether it is a primary or secondary twin. Based on the concomitant changes in the dominant slip mode predicted by the model and revealed by the texture development, we rationalize that the temperature-induced transition in contraction twinning is due to the increased predominance of basal hai slip at high temperatures (>673 K). Last, our analysis implies that all twin modes studied are rate insensitive and so the strong influence of strain rate and temperature on twinning is due to the rate-sensitivity of slip.

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“…EBSD data were collected using a TSL/EDAX system and initial data analysis was performed using TSL/EDAX OIM Analysis Software. Data post processing and twinning statistical analysis took advantage of a Los Alamos National Laboratory developed computer program 40 .…”

Section: Methodsmentioning

confidence: 99%

The critical role of grain orientation and applied stress in nanoscale twinning

McCabe¹,

Beyerlein

Carpenter³

et al. 2014

Nat Commun

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Numerous recent studies have focused on the effects of grain size on deformation twinning in nanocrystalline fcc metals. However, grain size alone cannot explain many observed twinning characteristics. Here we show that the propensity for twinning is dependent on the applied stress, grain orientation and stacking fault energy. The lone factor for twinning dependent on grain size is the stress necessary to nucleate partial dislocations from a boundary. We use bulk processing of controlled nanostructures coupled with unique orientation mapping at the nanoscale to show the profound effect of crystal orientation on deformation twinning. Our theoretical model reveals an orientation-dependent critical threshold stress for twinning, which is presented in the form of a generalized twinnability map. Our findings provide a newfound orientation-based explanation for the grain size effect: as grain size decreases the applied stress needed for further deformation increases, thereby allowing more orientations to reach the threshold stress for twinning.

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Automatic twin statistics from electron backscattered diffraction data

Cited by 36 publications

References 21 publications

Effect of microstructure on the nucleation of deformation twins in polycrystalline high-purity magnesium: A multi-scale modeling study

Effect of microstructure on the nucleation of deformation twins in polycrystalline high-purity magnesium: A multi-scale modeling study

Strain rate and temperature effects on the selection of primary and secondary slip and twinning systems in HCP Zr

The critical role of grain orientation and applied stress in nanoscale twinning

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