Transmission electron microscopy has often been used to observe the nature of the heavily cold worked condition in metals in order to evaluate the effect of this microstructure on subsequent processes and properties. However, interpretation of a heavily cold rolled microstructure when viewed normal to the rolling plane is made difficult by the fact that the average thickness of the elongated cells resulting from such deformation is often smaller than the thickness of the foil. The final thickness of a heavily rolled structure is often too thin for convenience in making thin foils trans- verse to the rolline plane. The technique of plating copper to thicken the thin cold rolled sample sufficiently for om pat ibility with standard methods for preparing transmission foils has been successfully used.
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