Accession Number:

AD0720781

Title:

Microscope Observations of TNT Crystallisation,

Descriptive Note:

Corporate Author:

DEFENCE STANDARDS LABS MARIBYRNONG (AUSTRALIA)

Personal Author(s):

Report Date:

1970-04-14

Pagination or Media Count:

11.0

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

Subject Categories:

  • Ammunition and Explosives
  • Crystallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE