It was established that incident-twin propagation through an obstacle-twin could be accommodated by both slip and twinning. Experimental results indicated that, for the incorporation of an incident-twin into an obstacle-twin/matrix interface, triplets of twinning dislocations were not a necessary condition. The ledge which was associated with the intersection could be associated with complex sessile configurations. Experimental results indicated the existence of an accommodation mechanism, that did not involve shear transfer on conventional (111) planes in the obstacle-twin, and led to the formation of strong rotation fields. The activation of secondary twinning in the obstacle-twin could result from this mechanism.

Electron Microscopic Observations of Twin-Twin Intersections in a Particle-Hardened Copper-Titanium Alloy. T.Radetic, V.Radmilovic, W.A.Soffa: Scripta Materialia, 1999, 40[7], 845-52