Interphase boundaries, between the matrix and '-precipitates, were investigated by means of positron annihilation and small-angle X-ray scattering. Full coherence for at least 2 pairs of boundary planes, and an absence of coarsening, were found. Particle dimensions of 8, 26 and 60nm were associated with matrix directions of <113>, <110> and <332>. A second positron lifetime component of 137ps was attributed to trapping at structural misfit dislocations, associated with ledges, with Burgers vectors of a/12<112>. These contained no jogs. A gradual change in concentration, caused by elastic interactions, appeared to occur at the matrix/particle interface (within a region that was about 1nm in thickness) and reduced the elastic strain.

V.Gröger, P.Fratzl, W.Pahl, O.Paris, G.Bischof, G.Krexner: Acta Metallurgica et Materialia, 1995, 43[3], 1305-11