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The locking of 35° 〈1 1 0〉 dislocations in NiAl

Authors
Journal
Acta Materialia
1359-6454
Publisher
Elsevier
Publication Date
Volume
52
Issue
19
Identifiers
DOI: 10.1016/j.actamat.2004.08.020
Keywords
  • Plastic Deformation
  • Dislocations
  • Intermetallics
  • Core Structure
  • Transmission Electron Microscopy

Abstract

Abstract Using high-resolution TEM, we observed the core structure of 〈1 1 0〉 dislocations in NiAl locked in 35° directions. These observations showed no evidence of climb decomposition. We conclude that the dislocations are not locked by climb decomposition but by the threefold core spreading of the large screw component of 35° 〈1 1 0〉 dislocations. In NiAl, 〈1 1 0〉 slip is more difficult than 〈1 1 1〉 slip because 〈1 1 0〉 dislocations are locked along two directions, whereas 〈1 1 1〉 dislocations are locked along the screw orientation only.

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