Accession Number : AD0642422

Title :   AN INVESTIGATION OF EXO-ELECTRON EMISSION FROM VARIOUS MATERIALS USING ABRASION AND ULTRASONIC TECHNIQUES.

Descriptive Note : Technical memo.,

Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK ORDNANCE RESEARCH LAB

Personal Author(s) : Williams,R. A.

Report Date : 03 OCT 1966

Pagination or Media Count : 71

Abstract : Exo-electron emission is the emission of electrons from materials which have been subjected to structural deformation. Brief descriptions of previous investigations, models and theories are given. Experimentally the phenomenon was investigated using the following materials: aluminum, brass, copper, stainless steel, cold rolled steel, columbium, lead, and nickel. An attempt to enhance the emission from aluminum 6061 was made using various stimuli. These stimuli include different abrasion methods, temperature variation, and ultrasonic irradiation. All of these stimuli were able to produce emission increases, but for prolonged emission a continual deformation appears necessary. The results of the investigation are discussed in relation to a number of theories and models. Satisfactory agreement between models was found, but a model involving a vacancy diffusion process appears most plausible. (Author)

Descriptors :   (*METALS, EMISSIVITY), ELECTRONS, ULTRASONIC RADIATION, TEMPERATURE, DEFORMATION, ABRASIVES, SURFACES

Subject Categories : Metallurgy and Metallography
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE