抄録
Elemental powders of Al and Ni with the composition of Al25Ni75 was mechanically alloyed in an Ar gas atmosphere for various periods using a horizontal ball mill. A single phase of Ni solid solution with Al super saturation was obtained by a long time milling. This Ni solid solution transformed into AINi3 compound (Ll2:ordered FCC) at around 700K with the enthalpy of 4.6kJ/mol. The hardness of hot-pressed compacts prepared from MA powders was higher than that of melted and solidified, irrespective of the MA time. The hot pressed compacts of MA powders showed compositional inhomogeneity when powders were milled shorter than 36ks and showed voids when powders were milled longer than 360ks. The suitable MA time for sintering was in the range between 72 and 180ks.
