Accession Number : AD0673545

Title :   A CRITICAL EXAMINATION OF DISCRETE LATTICE AND DISPERSED BARRIER HARDENING.

Descriptive Note : Technical rept.,

Corporate Author : NORTH AMERICAN ROCKWELL CORP LOS ANGELES CALIF LOS ANGELES DIV

Personal Author(s) : Sommer,A. W. ; Ono,Kanji

Report Date : MAY 1968

Pagination or Media Count : 33

Abstract : The paper examines two theories of thermally activated deformation of metals; i.e., the lattice (Peierls-Nabarro) and dispersed barrier hardening. The predictions of two hardening theories show considerable similarities. Only forecasts with respect to the impurity content dependence of the yield stress and activation volume are significantly different. Available data on low temperature deformation in alpha-Ti and body centered cubic metals have been considered. The presently available theories of lattice hardening cannot explain strong dependence of the yield stress of alpha-Ti and Mo on the interstitial content. In the case of other bcc metals, it is not possible to distinguish between these two types of hardening on an experimental basis. In fact, except in extremely pure materials, it is suggested that the two types of hardening may cooperate to control plastic flow. (Author)

Descriptors :   (*DISPERSION HARDENING, CRYSTAL DEFECTS), TITANIUM ALLOYS, IRON ALLOYS, MOLYBDENUM ALLOYS, MECHANICAL PROPERTIES, DISLOCATIONS, CRYSTAL LATTICES, CRYSTAL SUBSTRUCTURE, DEFORMATION, PHASE STUDIES

Subject Categories : Properties of Metals and Alloys
      Crystallography
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE