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Suzudo, Tomoaki; Onitsuka, Takashi*; Fukumoto, Kenichi*
no journal, ,
The irradiation produces various defects such as dislocation loops, voids, and solute clusters. Since they become obstacles for dislocations, research on the interaction between dislocations and obstacles has been pursued. Regarding the slip plane of BCC iron, the slip plane is {110} at low temperature but changes to {112} when the temperature increases to about room temperature; however, this phenomena has not been reproduced by molecular dynamics. We reconsidered the interatomic potential to reproduce the above temperature transition of the slip plane by molecular dynamics. In addition, the mechanism of the transition was discussed from the Peierls potential of the screw dislocation. As a result, it was found that the temperature transition of the slip plane can be reproduced by selecting an appropriate interatomic potential. It was also found that the temperature transition was likely to have been caused by temperature fluctuations of the lattice.
Suzudo, Tomoaki; Fukumoto, Kenichi*
no journal, ,
Body-centered cubic (BCC) metals are applied as structural materials to many components of nuclear reactors, and their thermal and mechanical integrity are of great importance. Much of the deformation of BCC metals at low temperatures is due to the movement of screw dislocations. The motion of screw dislocations in BCC metals is known to be complex. In this research, we succeeded in reproducing the transition of the slip plane as the temperature rise observed in the experiment for the first time using the latest molecular dynamics modeling method. Next, we devised an algorithm to analyze dislocation jumps over the Peierls barrier with high resolution, and showed that the cause of this slip-plane transition phenomenon is likely thermal fluctuation of lattice.