Thermal aging between 250 and 500 degrees C of ordered beta phase in a polycrystalline Cu-Al-Be shape memory alloy were performed, and the formation of phase gamma(2) was studied with optical and transmission electron microscopies and XRD techniques. The growth of gamma(2) phase shows a polynomial behavior, and Avrami curves as well as a Time-Temperature-Transformation diagram were constructed from these results. In addition, the formation of stable gamma(2) precipitates was studied in aged Cu-Al-Be ribbons. The presence of alpha regions surrounding gamma(2) precipitates for longer aging times at higher temperatures was observed, giving a consistent precipitation scheme.