Long-range internal stresses and asymmetric X-ray line-broadening in tensile-deformed [001]-orientated copper single crystals

Mughrabi, H.; Ungár, Tamás; Kienle, W.; Wilkens, M.

doi:10.1080/01418618608245293

Cited by 268 publications

(162 citation statements)

References 16 publications

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“…Ungar [32] found some dislocation cell structures very similar to our observations, but they are quite unlike the cells observed by other investigators (e.g., Johari and Thomas [33]). Gray and Follansbee [34] believe that increasing peak pressure or pulse duration decreased the observed dislocation cell size and increased the yield strength.…”

Section: (B) Mughrabi Andcontrasting

confidence: 48%

Effect of shock compression method on the defect substructure in monocrystalline copper

Cao

Lassila

Schneider

et al. 2005

Materials Science and Engineering: A

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Monocrystalline copper samples with orientations of [001] and [221] were shocked at pressures ranging from 20 GPa to 60 GPa using two techniques: direct drive lasers and explosively driven flyer plates. The pulse duration for these techniques differed substantially: 40 ns for the laser experiments at 0.5 mm into the sample and 1.1 ~1.4 µs for the flyer-plate experiments at 5 mm into the sample. The residual microstructures were dependent on orientation, pressure, and shocking method. The much shorter pulse duration in the laser driven shock yielded microstructures closer to the ones generated at the shock front. For the flyer-plate experiments, the longer pulse duration allows shockgenerated defects to reorganize into lower energy configurations. Calculations show that the post-shock cooling for the laser driven shock is 10 3 ~ 10 4 faster than that for plateimpact shock, propitiating recovery and recrystallization conditions for the latter. At the higher pressure level, extensive recrystallization was observed in the plate-impact samples, while it was absent in the laser driven shock. An effect that is proposed to contribute significantly to the formation of recrystallized regions is the existence of micro-shear-bands, which increase the local temperature beyond the prediction from adiabatic compression.

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Section: (B) Mughrabi Andcontrasting

confidence: 48%

Effect of shock compression method on the defect substructure in monocrystalline copper

Cao

Lassila

Schneider

et al. 2005

Materials Science and Engineering: A

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“…Asymmetric profiles corresponding to long-range internal stresses are related to the dipole polarization of dislocations [34,35,39,40]. Chemical heterogeneities are a special feature in Ni-base g/g 0 superalloys which have been treated in terms of lattice mismatch [39][40][41][42]. Anisotropic crystallite shape are a delicate phenomenon [26] which has been treated by special elegance in the case of ZnO nanoparticles [23].…”

Section: Introductionmentioning

confidence: 99%

“…The effect of microstresses are worked out in detail for dislocations [28][29][30][31][32][33][34][35][36][37][38]. Asymmetric profiles corresponding to long-range internal stresses are related to the dipole polarization of dislocations [34,35,39,40]. Chemical heterogeneities are a special feature in Ni-base g/g 0 superalloys which have been treated in terms of lattice mismatch [39][40][41][42].…”

Section: Introductionmentioning

confidence: 99%

Nanocrystalline materials studied by powder diffraction line profile analysis

Ungár¹,

Gubicza²

2007

Zeitschrift Für Kristallographie - Crystalline Materials

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Abstract. X-ray powder diffraction is a powerful tool for characterising the microstructure of crystalline materials in terms of size and strain. It is widely applied for nanocrystalline materials, especially since other methods, in particular electron microscopy is, on the one hand tedious and time consuming, on the other hand, due to the often metastable states of nanomaterials it might change their microstructures. It is attempted to overview the applications of microstructure characterization by powder diffraction on nanocrystalline metals, alloys, ceramics and carbon base materials. Whenever opportunity is given, the data provided by the X-ray method are compared and discussed together with results of electron microscopy. Since the topic is vast we do not try to cover the entire field.

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“…For example it may be easiest to describe deformation structures as a simple cell structure to those outside the field. The early work on polycrystals and the beautiful examples from tensile deformed [100] oriented copper single crystals (e.g., (Swarm 1963;Gottler 1973;Mughrabi, Ungar, Kienle and Wilkens 1986)) has strongly influenced a collective bias towards this simple view. However to form a strong basis that links the developing microstructure to the changing properties, this oversimplified picture must be replaced with one that includes the broader range of observed features.…”

Section: Introductionmentioning

confidence: 99%

Deformation microstructures and selected examples of their recrystallization

Hughes

2001

Surface & Interface Analysis

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The elements that are needed to describe a deformation structure—grains, grain boundaries, macroscale banding within crystals, cell blocks, geometrically necessary boundaries and incidental dislocation boundaries (cell boundaries)—are presented and described for fcc metals and alloys of medium to high stacking fault energy. Pertinent to this quantitative description are the local orientations, structural morphology, different boundary misorientations and spacings as a function of strain and deformation conditions. Three specific examples are given in which particular aspects of the deformation structure are shown to direct the recrystallization behavior. Copyright © 2001 John Wiley & Sons, Ltd; first published by Risø National Laboratory.

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Long-range internal stresses and asymmetric X-ray line-broadening in tensile-deformed [001]-orientated copper single crystals

Cited by 268 publications

References 16 publications

Effect of shock compression method on the defect substructure in monocrystalline copper

Effect of shock compression method on the defect substructure in monocrystalline copper

Nanocrystalline materials studied by powder diffraction line profile analysis

Deformation microstructures and selected examples of their recrystallization

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