Microstructural Observations on High Strength Polycrystalline Iron Whiskers.
VIRGINIA UNIV CHARLOTTESVILLE DEPT OF MATERIALS SCIENCE
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Polycrystalline iron whiskers produced by chemical vapor decomposition in the presence of a magnetic field have been investigated in regard to their microstructure and composition by transmission electron microscopy, field ion microscopy, and by X-ray and electron diffraction techniques. It was found that the whiskers consisted of a unique and complex microdispersion of iron oxides, iron carbide, and atomic carbon which bond the very small alpha-iron crystallites into a non-porous microstructure of high integrity. The mixing of strong covalent bonding with metallic bonding is proposed to explain the exceptionally high tensile strength of the whiskers. Author