PREDICTION OF BINARY TRANSITION TRANSITION-METAL AMORPHOUS-ALLOYS BY MECHANICAL ALLOYING

The glass forming ability of binary TM-TM (TM = transition metal) allo ys produced by mechanical alloying is studied with both two-dimensiona l maps of Miedema's coordinates and combinative coordinates. The forme r is constructed of Miedema's coordinates, the differences of electron egativities Delta phi and electron densities Delta n(ws)(1/3); the lat ter is constructed of the ratio Delta phi/Delta n(ws)(1/3) and size fa ctor(R(1) - R(2))/R(2). In these maps, binary systems which formed amo rphous phase are clearly separated from the non-formed systems by a cu rve. The equations of the curves are y = 3.825x, and y = 2.52x(-1/4) f or the pure Miedema coordinates and combinative coordinates, respectiv ely.