Abstract
The microstructure of polycrystalline iron whiskers, produced by chemical vapor decomposition in a magnetic field, is found to consist of a core extending the length of the whiskers surrounded by a series of approximately cylindrical layers made up of particles whose diameters are about 1000–3000 Å. These layers of particles are arranged to form a series of nearly concentric cylinders centered on the core. The grain size in both the core and the surrounding particles is found to be between 50 and 200 Å. The very high strength of these whiskers, 800 MPa, is considered a result of extreme grain refinement strengthening.
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