Dislocation studies on deformed single crystals of high-purity iron using positron annihilation: determination of dislocation densities

Technical Report · Tue Jul 15 04:00:00 EDT 1986

OSTI ID:6749440

Park, Y; Waber, J T; Meshii, M; Snead, C L; Park, C G

A new method for determining the total number of dislocations per unit area, as well as the fraction of screw and edge components, is presented. Single-crystal specimens that have been a) bent over a mandrel, b) cold rolled at room temperature, and c) deformed in tension at 200 K were studied. Etch pits were studied in connection with this work and were found to be primarily of the (111) type. The density of emergent dislocations as determined by the etch pits was found to be smaller than the number determined by the positron-annihilation technique.

• Research Organization: Northwestern Univ., Evanston, IL (USA). Dept. of Materials Science and Engineering
• OSTI ID: 6749440
• Report Number(s): AD-A-175601/4/XAB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
42 ENGINEERING
420500 -- Engineering-- Materials Testing
656002* -- Condensed Matter Physics-- General Techniques in Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANNIHILATION
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
BASIC INTERACTIONS
BENDING
CHEMICAL ANALYSIS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTALS
DEFORMATION
DISLOCATIONS
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ELEMENTS
ETCHING
FERMIONS
INTERACTIONS
IRON
LEPTONS
LINE DEFECTS
METALS
MONOCRYSTALS
NONDESTRUCTIVE ANALYSIS
POSITRONS
STRESSES
SURFACE FINISHING
TRANSITION ELEMENTS