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Title: Nucleation and growth of damage in polycrystalline aluminum under dynamic tensile loading

Plate-impact experiments were conducted to study the features and mechanisms of void nucleation and growth in the polycrystalline of pure aluminum under dynamic loading. Soft-recovered samples have been analyzed by metallographic microscopy, electron back scattering diffraction (EBSD), and synchrotron radiation x-ray tomography technology. It was found that most of the void nucleation in grains neared the boundaries of “weak-orientation” grains and grew toward the grain boundaries with fractured small grains around the boundaries. This was mainly caused by the accumulation and interaction of slip systems in the “weak-orientation” grains. In addition, the micro voids were nearly octahedron because the octahedral slip systems were formed by 8 slip planes in the polycrystalline of pure aluminum. The EBSD results are consistent with the three-dimensional structure observed by synchrotron radiation x-ray.
Authors:
; ; ;  [1] ; ;  [1] ;  [2] ;  [3]
  1. School of Science, Wuhan University of Technology, Wuhan, 430070 (China)
  2. (China)
  3. Laboratory for Shock Wave and Detonation Physics Research, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang, 621900 (China)
Publication Date:
OSTI Identifier:
22454472
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 5; Journal Issue: 3; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM; BACKSCATTERING; DYNAMIC LOADS; ELECTRON DIFFRACTION; ELECTRONS; GRAIN BOUNDARIES; INTERACTIONS; MICROSCOPY; NUCLEATION; POLYCRYSTALS; SLIP; SYNCHROTRON RADIATION; THREE-DIMENSIONAL LATTICES; VOIDS; X RADIATION