Isothermal devitrification phase transformations at 250degreesC in 17 Al-Ni-Gd (Al = 85-90 at.%) amorphous alloys were systematically investigated using DSC, XRD and TEM techniques. It was found that addition of Al or Ni promoted fcc-Al nanophase formation, while addition of Gd suppressed it. Fcc-Al nanoparticles are formed initially in most alloys at 250degreesC, while a metastable compound (tau(m)) and fcc-Al is formed simultaneously in certain alloys of high Gd content. As a result, a phase formation sequence map at 250degreesC was constructed. This map can be used for finding the optimal devitrification pathway, and developing alloying strategy, to obtain an ideal devitrified microstructure, and thus, is of technological importance.