REENTRANT CORNER MECHANISM OF FCC CRYSTAL-GROWTH OF A-TYPE TWIN LAMELLA - THE MONTE-CARLO SIMULATION APPROACH

A Monte-Carlo method is used to simulate the re-entrant corner growth of an fcc (111) crystal surface on which emerged the outcrop of a twin lamella of type A, composed of parallel stacking faults bounded by pa rtial dislocations. The results are compared with those of twin lamell ae of type B, stacking fault and screw dislocation mechanisms. It is f ound that the activity of the re-entrant corner mechanism induced by t he A-type lamella is smaller than that of the B-type twin lamella mech anism, and that it is larger than that of the stacking fault mechanism . However, it is less than that of the screw dislocation mechanism at low supersaturation.