Etch Pits at Dislocations in Nickel

A technique has been developed of revealing both grown-in and glide dislocations in nickel by etching any arbitrarily chosen crystal plane. The success of the method does not depend on decoration of dislocations and hence can be applied to the study of deformed structures without the necessity for a heat treatment. The geometric features of the etch pits are reported and their relationships to the crystallographic directions and planes of Ni are discussed. Bend tests showed a satisfactory agreement between calculated and measured dislocation densities. The etch has been employed to reveal dislocation distribution in as-grown, annealed, and deformed crystals.

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