ANOMALOUSLY HIGH-RATE OF GRAIN-BOUNDARY DISPLACEMENT UNDER FAST SHEARLOADING

A computer simulation is made of the grain boundary behavior in an alu minum sample under conditions of fast shear loading. The calculations are made using a molecular dynamics method and pseudopotential theory. It is observed that under these loading conditions, the grain boundar ies may undergo displacement at an anomalously high speed, even exceed ing the rate of the applied shear. The atomic mechanisms responsible f or this effect are investigated. (C) 1997 American Institute of Physic s. [S1063-7850(97)02607-4].