Accession Number:

AD0767390

Title:

The Strengthening, or Weakening, of Polycrystals Due to the Presence of Grain Boundaries.

Descriptive Note:

Technical rept.,

Corporate Author:

MARYLAND UNIV COLLEGE PARK ENGINEERING MATERIALS GROUP

Personal Author(s):

Report Date:

1973-08-01

Pagination or Media Count:

72.0

Abstract:

The grain boundaries which are present within a polycrystalline aggregate frequently contribute to strengthening the material because they provide a definite resistance to slip bands or twin bands that otherwise would propagate freely through the microstructure. Experimental and theoretical analyses which bear on this general subject are reviewed in this report. Particular attention is given to the following items The application of the Hall-Petch relation to a variety of microstructures and to providing an assessment of the complete stress-strain behavior The experimental and theoretical application of the stress-grain size analysis to specifying the brittle fracture stress, even for pre-cracked specimens, and to describing the ductile-brittle transition behavior of various materials and, The dependence on grain size of the hardness, creep, and fatigue properties of several metals and alloys, especially, as these properties are related to the conventional stress-strain behavior of these same materials. Modified author abstract

Subject Categories:

  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE