Accession Number : AD0711677

Title :   SURFACE-SENSITIVE MECHANICAL BEHAVIOR OR NICKEL MONOCRYSTALS.

Descriptive Note : Technical rept.,

Corporate Author : MARTIN MARIETTA CORP BALTIMORE MD RESEARCH INST FOR ADVANCED STUDIES

Personal Author(s) : Latanision,R. M.

Report Date : AUG 1970

Pagination or Media Count : 10

Abstract : It is suggested that near-surface vacancy and solute concentration gradients, image force effects, and notch effects due to surface ledges principally affect the yielding of film-free metal monocrystals through the action of near-surface dislocation sources. Once the specimen has yielded, then energetic problems associated with the creation of surface slip steps, and various factors introducing near-surface lattice distortions tend to inhibit dislocation emergence and lead to a preferentially work hardened surface layer. At the same time the glide of half-loops into the interior of the crystal is expected to create a disparity of dislocation signs near the surface. The above factors have been taken into account in interpreting the effects of electrochemical polarization during deformation on the mechanical behavior of nickel monocrystal electrodes. (Author)

Descriptors :   (*METAL CRYSTALS, SURFACE PROPERTIES), (*SINGLE CRYSTALS, MECHANICAL PROPERTIES), DISLOCATIONS, ELECTROCHEMISTRY, POLARIZATION, DEFORMATION, STRAIN HARDENING, ELECTRODES, YIELD POINT

Subject Categories : Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE