The role of matrix dislocations in growth ledge formation on f.c.c.[sbnd]b.c.c. interfaces in a Ni[sbnd]Cr alloy

Abstract

The structure of the interfaces between a f.c.c. matrix and b.c.c. precipitates, across which a Kurdjumov-Sachs orientation relationship holds, was examined in a Ni-45 mass% Cr alloy. Intruder matrix dislocations, whose Burgers vector is not parallel to the (111)_f.c.c ∥(110)_b.c.c, interface, were found to create new growth ledges. These dislocations can accommodate the misfit between the interplanar spacings of close-packed planes parallel to each other.