SOME OBSERVATIONS ON THE EFFECTS OF HYDROSTATIC PRESSURES TO 20,000 ATMOSPHERES ON THE STRUCTURE OF POLYCRYSTALLINE BISMUTH

Abstract

The effects of extreme hydrostatic pressure on a polycrystalline material which exhibits a high degree of elastic anisotropy were studied. Metallographically prepared polycrystalline bismuth samples were subjected to pressure levels up to 20,000 atmospheres in a piston type gas-liquid system. The observed structural changes consisted of deformation localized along the grain boundaries, which appears to be a boundary migration phenomena, and widespread slip and cross slip. Subsequent deformation is progressive with increased pressure, and is substantially different in type from the deformation characteristic of uniaxial compression. (Author)

Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1962
Accession Number
AD0276468

Entities

People

  • C.g. Homan
  • T.e. Davidson

Tags

DTIC Thesaurus Topics

  • Anisotropy
  • Atmospheres
  • Boundaries
  • Compression
  • Crystal Structure
  • Dynamic Pressure
  • Grain Boundaries
  • Hydrostatic Pressure
  • Materials
  • Migration
  • Observation
  • Polycrystals
  • Static Pressure

Readers

  • Combustion and Flow Dynamics.
  • Geotechnical Engineering.
  • Powder metallurgy of Titanium alloys.