Electron microscopy observations of twin-twin intersections in a particle hardened copper-titanium alloy

Abstract

The twin-twin intersections in the precipitation hardened two-phase copper-titanium alloys were studied using conventional and high-resolution electron microscopy. The incident twin propagation through an obstacle twin was accommodated by both slip and twinning. The ledge associated with the twin-twin intersections was associated with complex sessile configurations. The existence of an accommodation mechanism without shear transfer on conventional {111} planes in the obstacle twin led to the formation of strong rotation fields and activation of secondary twinning in the obstacle twin.