RECOVERY OF FLOW STRESS IN DEFORMED SINGLE CRYSTALS OF LITHIUM FLUORIDE

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

Document Details

Document Type
Technical Report
Publication Date
Nov 30, 1960
Accession Number
AD0250456

Entities

People

  • E.s. Machlin

Tags

Communities of Interest

  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Crystals
  • Dislocations
  • Energy
  • Fluorides
  • Heat Of Activation
  • High Temperature
  • Low Temperature
  • Observation
  • Optical Materials
  • Recovery
  • Single Crystals

Readers

  • Manufacturing Engineering.
  • Materials Science (Mechanical Engineering).
  • Nuclear and Radiation Engineering.