Low-energy dislocation structures in cyclically deformed Ni3Al single crystals

  • Hsiung L
  • Stoloff N
  • 3

    Readers

    Mendeley users who have this article in their library.
  • 13

    Citations

    Citations of this article.

Abstract

Low-energy dislocation structures in Ni3Al single crystals (oriented for single slip) fatigued at room temperature were studied using transmission electron microscopy. In general, dislocation structures in fatigued Ni3Al were composed of primary superdislocations, edge superdislocation bundles (mutually trapped edge superdislocations), primary edge superdislocation dipoles (line vector ∥ [121]), and faulted superdislocation dipoles (line vector ∥ [110] or ∥ [011]). No wall or cell structure was observed. Paired primary superdislocations, as they glided in the (111) slip plane during cyclic deformation, were energetically unstable because of the fluctuation of the separation between two superpartial dislocations (b = ± 1 2[101]). The fluctuation led to an increase in the line energy of the primary superdislocations, and resulted in the onset of several dislocation reactions. Since the resulting dislocations of these reactions were all sessile, their line energy remained unchanged during cyclic deformation. Accordingly, they were considered to be energetically more stable than primary superdislocations. © 1994.

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

Authors

  • L. M. Hsiung

  • N. S. Stoloff

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free