Mechanical Alloying Process of Al₇₀Pd_30-xM_nx Mixed Powders

Abstract

Pure crystalline powders of Al, Pd and Mn have been mechanically alloyed using a conventionally planetary ball mill (Fritsch "Pulverisette 7") with the intensity at 7 in an Ar atmosphere and A₇₀Pd_30-xMn_x (X=5, 10, 15 and 20) alloy powders have been synthesized. The alloying process was examined by X-ray diffractometry. An icosahedral phase quasicrystal with face-centred six=dimensional hypercubic lattice is obtained directly during milling for Al₇₀Pd_30-xMn_x powders with compositions X=5 and 10. The results are compared with data for liquid-solidified alloys. For Al₇₀Pd_30-xMn_x powders with compositions X=15 and 20, the formation of quasicrystalline phase is not observed.