Evolution of deformation structures under varying loading conditions followed in situ by high angular resolution 3DXRD

Wolfgang Pantleon, Christian Wejdemann, Bo Jakobsen, Ulrich Lienert, Henning F. Poulsen

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

With high angular resolution three-dimensional X-ray diffraction, individual subgrains are traced in the bulk of a polycrystalline specimen and their dynamics is followed in situ during varying loading conditions. The intensity distribution of single Bragg reflections from an individual grain is analyzed in reciprocal space. It consists of sharp high-intensity peaks arising from subgrains superimposed on a cloud of lower intensity arising from dislocation walls. Individual subgrains can be distinguished by their unique combination of orientation and elastic strain. The responses of polycrystalline copper to different loading conditions are presented: during uninterrupted tensile deformation, formation of subgrains can be observed concurrently with broadening of the Bragg reflection shortly after onset of plastic deformation. With continued tensile deformation, the subgrain structure develops intermittently. When the traction is terminated, stress relaxation occurs and number, size and orientation of subgrains are found to be constant. The subgrain structure freezes and only a minor clean-up of the dislocation structure is observed. When changing the tensile direction after pre-deformation in tension, a systematic correlation between the degree of strain path change and the changes in the dislocation structure quantified by the volume fraction of the subgrains is established. For obtaining the subgrain volume fraction, a new fitting method has been developed for partitioning the contributions of subgrains and dislocation walls
OriginalsprogEngelsk
TidsskriftMaterials Science & Engineering: A
Vol/bind524
Udgave nummer1-2
Sider (fra-til)55-63
ISSN0921-5093
DOI
StatusUdgivet - 2009

Citer dette

Pantleon, Wolfgang ; Wejdemann, Christian ; Jakobsen, Bo ; Lienert, Ulrich ; Poulsen, Henning F. / Evolution of deformation structures under varying loading conditions followed in situ by high angular resolution 3DXRD. I: Materials Science & Engineering: A. 2009 ; Bind 524, Nr. 1-2. s. 55-63.
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title = "Evolution of deformation structures under varying loading conditions followed in situ by high angular resolution 3DXRD",
abstract = "With high angular resolution three-dimensional X-ray diffraction, individual subgrains are traced in the bulk of a polycrystalline specimen and their dynamics is followed in situ during varying loading conditions. The intensity distribution of single Bragg reflections from an individual grain is analyzed in reciprocal space. It consists of sharp high-intensity peaks arising from subgrains superimposed on a cloud of lower intensity arising from dislocation walls. Individual subgrains can be distinguished by their unique combination of orientation and elastic strain. The responses of polycrystalline copper to different loading conditions are presented: during uninterrupted tensile deformation, formation of subgrains can be observed concurrently with broadening of the Bragg reflection shortly after onset of plastic deformation. With continued tensile deformation, the subgrain structure develops intermittently. When the traction is terminated, stress relaxation occurs and number, size and orientation of subgrains are found to be constant. The subgrain structure freezes and only a minor clean-up of the dislocation structure is observed. When changing the tensile direction after pre-deformation in tension, a systematic correlation between the degree of strain path change and the changes in the dislocation structure quantified by the volume fraction of the subgrains is established. For obtaining the subgrain volume fraction, a new fitting method has been developed for partitioning the contributions of subgrains and dislocation walls",
keywords = "X-ray diffraction, Plastic deformation, Dislocation structure, Tensile deformation, Stress relaxation, Strain path change",
author = "Wolfgang Pantleon and Christian Wejdemann and Bo Jakobsen and Ulrich Lienert and Poulsen, {Henning F.}",
year = "2009",
doi = "10.1016/j.msea.2009.04.008",
language = "English",
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Evolution of deformation structures under varying loading conditions followed in situ by high angular resolution 3DXRD. / Pantleon, Wolfgang; Wejdemann, Christian; Jakobsen, Bo; Lienert, Ulrich; Poulsen, Henning F.

I: Materials Science & Engineering: A, Bind 524, Nr. 1-2, 2009, s. 55-63.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Evolution of deformation structures under varying loading conditions followed in situ by high angular resolution 3DXRD

AU - Pantleon, Wolfgang

AU - Wejdemann, Christian

AU - Jakobsen, Bo

AU - Lienert, Ulrich

AU - Poulsen, Henning F.

PY - 2009

Y1 - 2009

N2 - With high angular resolution three-dimensional X-ray diffraction, individual subgrains are traced in the bulk of a polycrystalline specimen and their dynamics is followed in situ during varying loading conditions. The intensity distribution of single Bragg reflections from an individual grain is analyzed in reciprocal space. It consists of sharp high-intensity peaks arising from subgrains superimposed on a cloud of lower intensity arising from dislocation walls. Individual subgrains can be distinguished by their unique combination of orientation and elastic strain. The responses of polycrystalline copper to different loading conditions are presented: during uninterrupted tensile deformation, formation of subgrains can be observed concurrently with broadening of the Bragg reflection shortly after onset of plastic deformation. With continued tensile deformation, the subgrain structure develops intermittently. When the traction is terminated, stress relaxation occurs and number, size and orientation of subgrains are found to be constant. The subgrain structure freezes and only a minor clean-up of the dislocation structure is observed. When changing the tensile direction after pre-deformation in tension, a systematic correlation between the degree of strain path change and the changes in the dislocation structure quantified by the volume fraction of the subgrains is established. For obtaining the subgrain volume fraction, a new fitting method has been developed for partitioning the contributions of subgrains and dislocation walls

AB - With high angular resolution three-dimensional X-ray diffraction, individual subgrains are traced in the bulk of a polycrystalline specimen and their dynamics is followed in situ during varying loading conditions. The intensity distribution of single Bragg reflections from an individual grain is analyzed in reciprocal space. It consists of sharp high-intensity peaks arising from subgrains superimposed on a cloud of lower intensity arising from dislocation walls. Individual subgrains can be distinguished by their unique combination of orientation and elastic strain. The responses of polycrystalline copper to different loading conditions are presented: during uninterrupted tensile deformation, formation of subgrains can be observed concurrently with broadening of the Bragg reflection shortly after onset of plastic deformation. With continued tensile deformation, the subgrain structure develops intermittently. When the traction is terminated, stress relaxation occurs and number, size and orientation of subgrains are found to be constant. The subgrain structure freezes and only a minor clean-up of the dislocation structure is observed. When changing the tensile direction after pre-deformation in tension, a systematic correlation between the degree of strain path change and the changes in the dislocation structure quantified by the volume fraction of the subgrains is established. For obtaining the subgrain volume fraction, a new fitting method has been developed for partitioning the contributions of subgrains and dislocation walls

KW - X-ray diffraction

KW - Plastic deformation

KW - Dislocation structure

KW - Tensile deformation

KW - Stress relaxation

KW - Strain path change

U2 - 10.1016/j.msea.2009.04.008

DO - 10.1016/j.msea.2009.04.008

M3 - Journal article

VL - 524

SP - 55

EP - 63

JO - Materials Science and Engineering: A - Structural Materials: Properties, Microstructure and Processing

JF - Materials Science and Engineering: A - Structural Materials: Properties, Microstructure and Processing

SN - 0921-5093

IS - 1-2

ER -