The dislocation structure in beryllium single crystals deformed by prismatic slip

Jönsson, Sigurd; Beuers, J.

doi:10.1016/0025-5416(87)90289-8

Cited by 20 publications

(6 citation statements)

References 18 publications

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“…Concerning twinning, transmission electron microscopy (TEM), [22,33] and texture [34] measurements have demonstrated that beryllium twins on the {10 2} ͗ 011͘ system when subjected to a compressive stress perpendicular to the basal pole. However, in these references, no twinning was observed when the compression was parallel to the basal pole (precluding the relaxation of {0002} strains parallel to the load in contrast with the behavior that was observed in this study).…”

Section: B Epsc Modelmentioning

confidence: 99%

“…[22,30,31] Briefly, a population of grains is chosen with orientations and weights appropriate for the texture that is to be modeled. After verifying that the weak measured texture of S200-D beryllium had little effect on the calculation, a random texture was assumed for efficiency of computer time.…”

Section: Polycrystal Modelmentioning

confidence: 99%

“…[6,22] The slip direction (or Burger's vector, b) for both basal and prismatic lies in the basal plane precluding the possibility of inelastic behavior in the basal direction. Finally, there is pyramidal c ϩ a slip, {112 --2} ͗112 --3͘, which does produce plastic deformation with a component in the ͗0002͘ direction.…”

Section: Introductionmentioning

confidence: 99%

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A neutron diffraction and modeling study of uniaxial deformation in polycrystalline beryllium

Brown

Bourke

Tomé

et al. 2003

Metall Mater Trans A

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The deformation of polycrystalline beryllium to strains of Ϯ0.8 pct in uniaxial tension and compression was studied by neutron diffraction and modeled using an elasto-plastic self-consistent (EPSC) model. The beryllium response is asymmetric with respect to tension and compression in both the macroscopic behavior, as displayed in the stress/strain curve, and the microscopic lattice response. The EPSC model qualitatively reproduces the lattice strain curves in tension and compression with the assumption of pyramidal slip being active, in addition to prism and basal slip and with the inclusion of thermal residual stresses developed during processing. Although it underpredicts the magnitude of the observed strains, it demonstrates that accounting for residual stresses of thermal origin is crucial for understanding the evolution of lattice strains during uniaxial loading.

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Section: B Epsc Modelmentioning

confidence: 99%

Section: Polycrystal Modelmentioning

confidence: 99%

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A neutron diffraction and modeling study of uniaxial deformation in polycrystalline beryllium

Brown

Bourke

Tomé

et al. 2003

Metall Mater Trans A

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“…Beryllium, in particular, primarily slips on the basal system, {00.2}/11.0S or, secondarily, on the prismatic system, {10.0} /11.0S [14][15][16]. Plastic deformation out of the basal plane must be accomplished by either pyramidal slip, {10.1}/11.3S, or twinning on the {10.2}/10.1S system.…”

Section: Introductionmentioning

confidence: 98%

Twinning and de-twinning in beryllium during strain path changes

Brown

Almer

Clausen

et al. 2013

Materials Science and Engineering: A

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“…[8] The secondary system is prismatic, , although its critical resolved shear stress for activation is several times higher than for basal. [8,9] The slip directions (or Burger's vector, b) for both basal and prismatic slip lie in the basal plane, precluding the possibility of plastic deformation out of the basal plane. In contrast, pyramidal c ϩ a slip, , produces plastic deformation with a component out of the basal plane.…”

Section: Introductionmentioning

confidence: 99%

Development of crystallographic texture during high rate deformation of rolled and hot-pressed beryllium

Brown

Abeln

Blumenthal

et al. 2005

Metall Mater Trans A

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Weakly textured hot-pressed (HP) beryllium and strongly textured hot-rolled beryllium were compressed using a split-Hopkinson pressure bar (SHPB) (strain rate ϳ4500 s Ϫ1 ) to a maximum of 20 pct plastic strain as a function of temperature. The evolution of the crystallographic texture was monitored with neutron diffraction and compared to polycrystal plasticity models for the purpose of interpretation. The macroscopic response of the material and the active deformation mechanisms were found to be highly dependent on the orientation of the load with respect to the initial texture. Specifically, twinning is inactive when loaded parallel to the strong basal fiber but accounts for 27 pct of the plastic strain when loaded transverse to the basal fiber. In randomly textured samples, 15 pct of the plastic strain is accomplished by twinning. The role of deformation mechanisms with components out of the basal plane (i.e., twinning and pyramidal slip) is discussed.

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The dislocation structure in beryllium single crystals deformed by prismatic slip

Cited by 20 publications

References 18 publications

A neutron diffraction and modeling study of uniaxial deformation in polycrystalline beryllium

A neutron diffraction and modeling study of uniaxial deformation in polycrystalline beryllium

Twinning and de-twinning in beryllium during strain path changes

Development of crystallographic texture during high rate deformation of rolled and hot-pressed beryllium

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