Accession Number : AD0250456

Title :   RECOVERY OF FLOW STRESS IN DEFORMED SINGLE CRYSTALS OF LITHIUM FLUORIDE

Corporate Author : MATERIALS RESEARCH CORP YONKERS NY

Personal Author(s) : MACHLIN, E.S.

Report Date : 30 NOV 1960

Pagination or Media Count : 1

Abstract : THE TIME AND TEMPERATURE DEPENDENCE OF THE FLOW STRESS IN LIF SINGLE CRYSTALS WAS MEASURED. A TWO STAGE RECOVERY WAS FOUND. THE LOW TEMPERATURE RECOVERY OBEYED AN ACTIVATION ENERGY OF 5250 PLUS OR MINUS 700 CAL/MOL. THE HIGH TEMPERATURE RECOVERY FOLLOWED AN ACTIVATION ENERGY OF 43,500 PLUS OR MINUS 6000 CAL/MOL. BASED ON OBSERVATION OF THE PRESENCE OR LACK OF MOTION OF DISLOCATIONS DURING RECOVERY A THEORY FOR THE RECOVERY PROCESS IS SUGGESTED. THE RATE DETERMINING STEP FOR LOW TEMPERATURE RECOVERY IS SUGGESTED TO BE THE GLIDE OF NONCONSERVATIVE JOGS ALONG SCREW DISLOCATIONS; THAT FOR HIGH TEMPERATURE RECOVERY IS DISLOCATION CLIMB AND THE ANNIHILATION OF JOGS ALONG EDGE DISLOCATIONS

Descriptors :   *SINGLE CRYSTALS, *STRESSES, FLUORIDES, LITHIUM COMPOUNDS, MEASUREMENT, MECHANICAL PROPERTIES, RECOVERY.

Distribution Statement : APPROVED FOR PUBLIC RELEASE