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Title: Polychromatic Microdiffraction Analysis of Defect Self-Organization in Shock Deformed Single Crystals

Abstract

A spatially resolved X-ray diffraction method - with a submicron 3D resolution together with SEM and OIM analysis are applied to understand the arrangements of voids, geometrically necessary dislocations and strain gradient distributions in samples of Al (1 2 3) and Cu (0 0 1) single crystals shocked to incipient spallation fracture. We describe how geometrically necessary dislocations and the effective strain gradient alter white beam Laue patterns of the shocked materials. Several distinct structural zones are observed at different depths under the impact surface. The density of geometrically necessary dislocations (GNDs) is extremely high near the impact and back surface of the shock recovered crystals. The spall region is characterized by a large density of mesoscale voids and GNDs. The spall region is separated from the impact and back surfaces by compressed regions with high total dislocation density but lower GNDs density. Self-organization of shear bands is observed in the shock recovered Cu single crystal.

Authors:
 [1];  [1];  [1];  [2];  [2]
  1. ORNL
  2. Lawrence Livermore National Laboratory (LLNL)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
965819
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
International Journal of Plasticity
Additional Journal Information:
Journal Volume: 25; Journal Issue: 11
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; DISLOCATIONS; MONOCRYSTALS; VOIDS; ALUMINIUM; COPPER; LAUE METHOD; STRAINS; X-RAY DIFFRACTION; MICROANALYSIS

Citation Formats

Barabash, Rozaliya, Ice, Gene E, Liu, Wenjun, Belak, J., and Kumar, M. Polychromatic Microdiffraction Analysis of Defect Self-Organization in Shock Deformed Single Crystals. United States: N. p., 2009. Web. doi:10.1016/j.ijplas.2009.01.002.
Barabash, Rozaliya, Ice, Gene E, Liu, Wenjun, Belak, J., & Kumar, M. Polychromatic Microdiffraction Analysis of Defect Self-Organization in Shock Deformed Single Crystals. United States. doi:10.1016/j.ijplas.2009.01.002.
Barabash, Rozaliya, Ice, Gene E, Liu, Wenjun, Belak, J., and Kumar, M. Thu . "Polychromatic Microdiffraction Analysis of Defect Self-Organization in Shock Deformed Single Crystals". United States. doi:10.1016/j.ijplas.2009.01.002.
@article{osti_965819,
title = {Polychromatic Microdiffraction Analysis of Defect Self-Organization in Shock Deformed Single Crystals},
author = {Barabash, Rozaliya and Ice, Gene E and Liu, Wenjun and Belak, J. and Kumar, M.},
abstractNote = {A spatially resolved X-ray diffraction method - with a submicron 3D resolution together with SEM and OIM analysis are applied to understand the arrangements of voids, geometrically necessary dislocations and strain gradient distributions in samples of Al (1 2 3) and Cu (0 0 1) single crystals shocked to incipient spallation fracture. We describe how geometrically necessary dislocations and the effective strain gradient alter white beam Laue patterns of the shocked materials. Several distinct structural zones are observed at different depths under the impact surface. The density of geometrically necessary dislocations (GNDs) is extremely high near the impact and back surface of the shock recovered crystals. The spall region is characterized by a large density of mesoscale voids and GNDs. The spall region is separated from the impact and back surfaces by compressed regions with high total dislocation density but lower GNDs density. Self-organization of shear bands is observed in the shock recovered Cu single crystal.},
doi = {10.1016/j.ijplas.2009.01.002},
journal = {International Journal of Plasticity},
number = 11,
volume = 25,
place = {United States},
year = {2009},
month = {1}
}