Accession Number:

AD0781222

Title:

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

Descriptive Note:

Technical rept.

Corporate Author:

BROWN UNIV PROVIDENCE RI DIV OF ENGINEERING

Personal Author(s):

Report Date:

1974-03-01

Pagination or Media Count:

46.0

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.

Subject Categories:

  • Metallurgy and Metallography
  • Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE