Abstract
Copper canister will be used in Scandinavia for final storage of spent nuclear fuel. The copper will be exposed to temperatures of up to 100 °C. The creep mechanism at near ambient temperatures has been assumed to be glide of dislocations, but this has never been verified for copper or other materials. In particular, no feasible mechanism for glide based static recovery has been proposed. To attack this classical problem, a glide mobility based on the assumption that it is controlled by the climb of the jogs on the dislocations is derived and shown that it is in agreement with observations. With dislocation dynamics (DD) simulations taking glide but not climb into account, it is demonstrated that creep based on glide alone can reach a quasi-stationary condition. This verifies that static recovery can occur just by glide. The DD simulations also show that the internal stress during creep in the loading direction is almost identical to the applied stress also directly after a load drop, which resolves further classical issues.
Highlights
Copper shows creep deformation at as low a temperature as 75 ◦ C
The glide rate of dislocations in copper at low temperatures is much higher than the climb rate
The glide rate has been derived based on the assumption that it is controlled by the climb of the jogs on the dislocations
Summary
Copper shows creep deformation at as low a temperature as 75 ◦ C. The appearance of the creep curves is quite similar to those recorded at higher temperatures. Recovery creep theory is the basis of our understanding of the mechanisms during plastic deformation at elevated temperatures. Recovery is based on climb of dislocations that can move in a non-conservative way. In this way, dislocations of opposite sign can attract and annihilate each other. Any recovery must be based on glide It has been assumed in general that the dislocation mobility is controlled by glide at low temperatures [1,4]
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