Some observations on the relation between dislocation substructure and power law breakdown in creep Academic Article uri icon


  • It is noted that there is a great deal of evidence to suggest that power law breakdown in creep in subgrain forming materials may be associated with major changes in dislocation substructural arrangement. Below the stress at which power law breakdown occurs, well-defined subgrains are formed and are maintained throughout the process of creep. Above this stress, less well-defined but perhaps stronger cell structures are observed. A simple calculation shows that the stress at which the transition is expected based on experimentally determined values of the spacing of dislocations in sub-boundaries is consistent with the value of stress at which power law breakdown is typically observed. 1981.

published proceedings

  • Scripta Metallurgica

author list (cited authors)

  • Pharr, G. M.

citation count

  • 20

complete list of authors

  • Pharr, George M

publication date

  • July 1981