Work softening in nanocrystalline materials induced by dislocation annihilation

Tamás Ungár, Li Li, Géza Tichy, Wolfgang Pantleon, Hahn Choo, Peter K. Liaw

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Cold rolling reduces the quantity of dislocation densities in Ni-18% Fe alloys prepared by electrochemical deposition. The dislocation density evolution proposed earlier for the linearly decreasing work-hardening rate during stage III is revisited. The solution of the differential equation predicts that when the initial dislocation density is smaller or larger than the saturation value, then the dislocation density will increase or decrease during further plastic deformation. The predictions are verified by experimental values of dislocation densities determined by X-ray line-profile analysis.

Original languageEnglish
Pages (from-to)876-879
Number of pages4
JournalScripta Materialia
Volume64
Issue number9
DOIs
Publication statusPublished - May 1 2011

Keywords

  • Dislocations
  • Work hardening
  • Work softening
  • X-ray line-profile analysis

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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