Abstract
Conventional and high resolution transmission electron microscopy has been used to study the effect of interphase boundaries on the deformation of a polyphase aggregate. The aggregate consists of augite which during cooling has exsolved enstatite and pargasite lamellae. It originates from a pyroxenite dyke of the Balmuccia peridotite massif located within the Ivrea Zone (NW-Italy). Deformation of the aggregate may have taken place during tilting of the Ivrea Zone at temperatures of about 650 °C. During deformation lattice dislocations interact with the interphase boundaries. Incorporation of lattice dislocations into the boundary leads to a change of the interface structure. The structural change may be interpreted as a superposition of a subgrain structure on the interface misfit structure. In general, tilt and twist components are produced, with tilts about the common chain axis being largest. Different mechanisms of dislocation-interface interactions are discussed.
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