Structural characterization by high-resolution electron microscopy of an Al–Mg alloy processed by high-pressure torsion
作者： Manping Liu , Hans J. Roven , Maxim Murashkin , Ruslan Z. Valiev
DOI: 10.1016/J.MSEA.2008.02.053
关键词:
摘要: Abstract Defects and deformation structures including 0° 60° full dislocations, 30° Shockley partials, stacking faults twins in a nanostructured Al–Mg alloy processed by high-pressure torsion were identified using high-resolution transmission electron microscopy. The twinning mechanism previously predicted the molecular dynamics simulation, i.e., homogeneous involving dynamic overlapping of inside grains, was directly verified. A four-layer twin formed four experimentally observed. Deformation partial dislocations ultrafine grains confirmed. These results suggest that dislocation emissions from grain boundaries could become ultrafine-grained aluminum during severe plastic deformation.
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