Torsional relaxation in polycrystalline cadmium as a function of surface phenomena.
Edelson, Burton I.
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An investigation of the tortional after-effects in polycrystalline cadmium wires which had undergone torsional plastic deformation was made. The influence of surface phenomena on relaxation rates was studied. Relaxation rates of clean wires were not influenced by the surrounding media; air, distilled water and dilute sulfuric acid. Relaxation rates of wires which had an oxide surface film were greater than those of the clean wires, and application of acid to oxidized wires caused reversals in the strain versus log time relaxation curves. Cold working caused the initial strain rate to increase; annealing prior to oxidation caused it to decrease. Increasing film thickness did not effect relaxation rate but lengthened the time during which reversal occurred. Delay in applying acid to oxidized wires increased the amount of reversal and the time for it to occur. Oxidizing the wire after twisting caused the initial strain rate to be smaller, but when acid was applied the rate became greater. The results are explained by assuming the oxide films to act as elastic, coherent jackets which modify the normal relaxation rates of the bare wires.
This thesis document was issued under the authority of another institution, not NPS. At the time it was written, a copy was added to the NPS Library Collection for reasons not now known. It has been included in the digital archive for its historical value to NPS. Not believed to be a CIVINS (Civilian Institutions) title.
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