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