O-LATTICE ANALYSES OF INTERFACIAL MISFIT .2. SYSTEMS CONTAINING INVARIANT LINES

Mismatch in interfaces containing an invariant line is analysed on the basis of the O-lattice concept and the properties of the invariant li ne strain. An optimum orientation relationship is proposed to satisfy the requirement for the existence of the O lines. The corresponding ha bit plane will contain the O lines, and the mismatch in the habit plan e will be accommodated completely by a single set of dislocations. The concept of an effective invariant line is introduced. An example is g iven for a Zr-2.5 wt% Nb alloy, showing the method of search for the o ptimum orientation relationship. The corresponding interfacial structu re in the habit plane is also provided.