Slip transfer at coherent twin boundaries in L12-ordered alloys was investigated by analysis of plastically deformed Cu3Au and Ni3Al specimens in a transmission electron microscope. A comparison between the ex situ deformed material and previous in situ experiments was made. In ordered Cu3Au, antiphase boundaries induced by slip transfer were found at a coherent twin boundary, similar to the in situ deformed material. On the other hand, in Ni3Al superlattice intrinsic stacking faults were detected at coherent twin boundaries which have not been observed in in situ deformed material. A possible mechanism for superlattice intrinsic stacking fault formation was discussed. The transfer of slip, and the associated creation of stacking faults at coherent twin boundaries in both materials was described in terms of absorption of super-dislocations in the boundary and the general criteria for slip transfer at grain boundaries.

Slip Transfer at Coherent Twin Boundaries in Ni3Al and Ordered Cu3Au. Tichelaar, F.D., Rongen, P.H.H., Zhang, Y.G., Schapink, F.W.: Interface Science, 1994, 2[1], 105-17