Abstract The present study reports the results of the effects of cold-work on an alloy undergoing an order - disorder transformation. The particular system chosen was the Ni 4Mo composition which possesses an ordered b.c.t. structure below 868°C, while above this critical temperature a disordered f.c.c. lattice is present. By analysing X-ray diffraction, metallography and hardness measurements, it has been possible to compare the kinetics of ordering of a 60% deformed sample with an asquenched alloy. Though in both cases a heterogenous growth mode was operative, the cold-worked sample on a macroscopic scale exhibited a much more uniform domain size than did the as-quenched alloy. Moreover, this latter regular microstructure had faster growth kinetics than had the as-quenched alloy.