Al-15Cu-1Mg alloys have been directionally solidified in 3㎜ diameter alumina tubes under the conditions of 760℃ of furnace temperature and 12㎝/hr of furnace moving velocity(V). By analyzing the evolution of the temperature profiles along the alloy length, the position of the solid/liquid interface, temperature gradient(G) and local growth velocity (R) were determined. These growth characteristics were compared for 6, 10, 14㎝ length alloys. Steady state growth region was obtained in 15㎝ length alloy, not in 6, 10㎝.