Accession Number : AD0612160

Title :   THE RECOVERY OF THE ULTRASONIC ATTENUATION IN COPPER SINGLE CRYSTALS FOLLOWING SMALL PLASTIC DEFORMATION,

Corporate Author : WATERVLIET ARSENAL N Y

Personal Author(s) : Frankel,Julius

Report Date : 1962

Pagination or Media Count : 17

Abstract : When a metal undergoes small plastic deformation, there is a change in its apparent Young's Modulus and internal friction. Both of these quantities recover following the deformation. This experiment was made to study the decrease of ultrasonic attenuation in copper single crystals following small plastic deformation. The change in the attenuation of an ultrasonic wave in a stressed single crystal does not take place smoothly. This work indicates that more than one recovery process is involved, and that the most clearly measured process has an activation energy of 1.5ev.

Descriptors :   (*COPPER, SINGLE CRYSTALS), (*ULTRASONIC RADIATION, SINGLE CRYSTALS), (*SINGLE CRYSTALS, ULTRASONIC RADIATION), (*DEFORMATION, COPPER), HEAT OF ACTIVATION, ATTENUATION, STRESSES, ELASTIC PROPERTIES, CRYSTAL DEFECTS, MATHEMATICAL ANALYSIS

Distribution Statement : APPROVED FOR PUBLIC RELEASE