Accession Number : AD0720781

Title :   Microscope Observations of TNT Crystallisation,

Corporate Author : DEFENCE STANDARDS LABS MARIBYRNONG (AUSTRALIA)

Personal Author(s) : Chick,M. C. ; Connick,W. ; Thorpe,B. W.

Report Date : 14 APR 1970

Pagination or Media Count : 11

Abstract : The growth and grain structure of cast TNT have been observed in thin films using a polarishing microscope. Growth rate of solid into liquid is found to increase with undercooling from the melting point at 80C to a peak at about 30C. Growth rate at lower temperatures decreases with undercooling until it is zero at - 15C where a glass is formed. At nucleation temperatures above about 60C, growth is of the normal linear form where elongated grains with preferred orientation grow with faceted interfaces and a strong tendency to form intergranular voids. At high undercoolings growth is spherulitic. (Author)

Descriptors :   (*TNT, CRYSTAL GROWTH), GRAIN SIZE, MICROSTRUCTURE, CRYSTALLIZATION, NUCLEATION, ELECTRON MICROSCOPY, FILMS, AUSTRALIA

Subject Categories : Ammunition and Explosives
      Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE