The effects of Cu and Fe additions on the thermal stability, microstructure and mechanical properties of Al 85 ?Ni 8.5 ?Mm 6.5 ,Al 84 ?Ni 8.5 ?Mm 6.5 Cu 1 ,Al 84 ?Ni 8.5 ?M m6.5 Fe 1 alloys, manufactured by gas atomization, degassing and hot-extrusion were investigated. Gas atomization, with a wide super-cooled liquid region, allowed the alloy powders to exhibit varying microstructure depending primarily on the powder size and composition. Al hotextruded alloys consisted of homogeneously-distributed fine-grained fcc-Al matrix and intermetallic compounds. A substitution of 1 at.% Al by Cu increased the thermal stability of the amorphous phase and produced alloy microstructure with smaller fcc-Al grains. On the other hand, the same substitution of 1 at.% Al by Fe decreased the stability of the amorphous phase and produced larger fcc-Al grains. The formation of intermetallic compounds such as Al 3 Ni,Al 11 Ce 3 andAl 11 La 3 was suppressed by the addition of Cu or Fe. Among the three alloys examined, the highest Vickers hardness and compressive strength were obtained for Al 84 ?Ni 8.5 ?M m6.5 Cu 1 alloy, and related to the finest fcc-Al grain size attained from increased thermal stability with Cu addition.