Thermally Activated Flow and Strain Rate History Effects for Some Polycrystalline FCC Metals

Abstract

It is shown in the paper that the strain rate history effects play a very important role in the plastic behavior of polycrystalline fcc metals. These effects are attributed to some differences in the effective dislocation multiplication rates at different strain rates. A mathematical description of the effects discussed is possible by a coupling of two relationships. One of these is the relation resulting from the thermally activated process which is dominating at a certain level of strain, while the second is of an evolutionary type. An evolutionary relationship describes the changes in structure during the course of plastic deformation. A few examples of an evolutionary relationship along with a thermally activated intersection model are discussed.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1974
Accession Number
AD0781222

Entities

People

  • J. Klepaczko

Organizations

  • Brown University

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Crystal Lattices
  • Crystal Structure
  • Deformation (Mechanics)
  • Differential Equations
  • Dislocations
  • Electron Microscopy
  • Equations
  • Experimental Data
  • Hardening
  • Plastic Deformation
  • Polycrystals
  • Shear Modulus
  • Strain Hardening
  • Strain Rate
  • Stress Strain Relations
  • Stresses
  • Tensile Strain

Readers

  • Materials Science and Engineering.
  • Microbial Pathology