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

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

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 ob...

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Bibliographische Detailangaben
Hauptverfasser: DAVIDSON,T.E, HOMAN,C.G
Format: Report
Sprache:eng
Schlagworte:
CRYSTAL STRUCTURE
DEFORMATION
HYDROSTATIC PRESSURE
SHEAR STRESSES
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Zusammenfassung: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)