TRANSIENTS IN ANTIPHASE COARSENING

We consider transient behaviour in antiphase coarsening in simple bina ry alloys, and corrections to late-stage asymptotic scaling with an ex ponent of one half. (The problem might be of some importance to the me tallurgical properties of composite microstructures.) Segments of anti phase boundaries in three dimensions, with initially small total curva ture, evolve rapidly, resulting in an effective growth exponent n(eff) (t) = 1/2[1 + xi'/R(t)BAR] where xi' is a microscopic length and R(t)B AR is the characteristic antiphase-domain size at time t.