Creep of Copper under Deuteron Bombardment

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Abstract
The creep rate of copper under deuteron bombardment has been investigated using the 16-Mev external beam of the University of Pittsburgh cyclotron. Measurements were made of the second stage creep rate of a copper wire under deuteron bombardment at a temperature of 260°C and a loading of 10,000 psi. Within the precision of the experiment ±20 percent, the creep rate during and after bombardments of 10 to 20 hours duration was unchanged from the creep rate preceding bombardment. Theoretical considerations of the type discussed by Slater, predict that with the available deuteron flux of 1012 particles per cm2 per sec there should be no appreciable change in creep rate. The available deuteron flux cannot displace enough atoms from their normal lattice sites to produce a dislocation involving a hundred atoms or more; further, the steady-state density of displaced atoms is not enough to impede the motion of those dislocations present in the crystals. While regions of increased local temperature are produced during bombardment, these also should not affect the creep rate. Thus, apparently the considerations of solid-state theory are confirmed and creep rates should not be expected to increase for all metals under bombardment.

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