Accession Number : AD0710358

Title :   DISLOCATION CHANNELING IN IRRADIATED METALS,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : Smidt,Fred A. , Jr

Report Date : 03 JUN 1970

Pagination or Media Count : 17

Abstract : The present understanding of the phenomenon of dislocation channeling, or the removal of defect aggregates from the slip plane by glide dislocations in irradiated or quenched metals, is reviewed. Channeling is a general feature of any system where penetrable defect aggregates are removed by the glide dislocations. The crystallography of the channels and their correspondence with surface slip traces is shown to be well established. It is shown that several areas of the problem require further research in order to gain an adequate understanding of the phenomenon. In particular the mechanism of initiation of the channels, the dislocation-defect interaction mechanism in which defects are annihilated or assimilated, and the mechanism of work hardening, which stops further deformation in a channel, require further study. In addition, a quantitative correlation between the microscopic parameters of channeling and the macroscopic properties of the work hardening coefficient and ductility is needed. (Author)

Descriptors :   (*METALS, DAMAGE), (*DEFECTS(MATERIALS), REMOVAL), DISLOCATIONS, DEFORMATION, QUENCHING, MICROSTRUCTURE, (U)MICROSTRUCTURE

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE