Accession Number : AD0286320

Title :   SOME ASPECTS OF GRAIN BOUNDARY MIGRATION IN PLASTICALLY DEFORMED SINGLE CRYSTALS

Corporate Author : BROWN UNIV PROVIDENCE R I METALS RESEARCH LAB

Personal Author(s) : BASU,B.K. ; ELBAUM,C.

Report Date : MAY 1962

Pagination or Media Count : 1

Abstract : The migration of various grain boundaries is studied in Al specimens; these specimens are prepared from single crystals, deformed plastically at room temperature. Boundary velocities are measur d (for a given temperature) as a function of boundary rotation and position paramenters. Dislocation densities and arrangements are determined in the recrystallized volume of the specimen, by means of an X-ray diffraction technique suitable for this purpose. Large differences have been found in the mobility of grain boundaries, as a function of boundary position (tilt or twist), for a given rotation angle. Correlations between boundary angle and dislocation density in the recrystallized volume are discussed. The passage of certain grain boundaries was found to produce crystals of unusually low dislocation density and very uniform reflecting power for X-rays. Crystals of comparable perfection are frequently encountered in some ionic and covalent solids, but are quite unusual in Al. (Author)

Descriptors :   *ALUMINUM, *GRAIN STRUCTURES (METALLURGY), *SINGLE CRYSTALS, CRYSTALLIZATION, CRYSTALS, DEFORMATION, PLASTIC PROPERTIES, SOLIDS, X RAY DIFFRACTION

Distribution Statement : APPROVED FOR PUBLIC RELEASE