Atomic-level observation of disclination dipoles in mechanically milled, nanocrystalline Fe

M. Murayama, J. M. Howe, H. Hidaka, S. Takaki

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Abstract

Plastic deformation of materials occurs by the motion of defects known as dislocations and disclinations. High-resolution transmission electron microscopy was used to directly reveal the individual dislocations that constitute partial disclination dipoles in nanocrystalline, body-centered cubic iron that had undergone severe plastic deformation by mechanical milling. The mechanisms by which the formation and migration of such partial disclination dipoles during deformation allow crystalline solids to fragment and rotate at the nanometer level are described. Such rearrangements are important basic phenomena that occur during material deformation, and hence, they may be critical in the formation of nanocrystalline metals by mechanical milling and other deformation processes.

Original languageEnglish
Pages (from-to)2433-2435
Number of pages3
JournalScience
Volume295
Issue number5564
DOIs
Publication statusPublished - Mar 29 2002
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • General

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