GLASS-FORMATION AND EXTENDED SOLUBILITIES IN MECHANICALLY ALLOYED COBALT TRANSITION-METAL ALLOYS

Binary Co-TM (TM ≡ Mn, Cr, V) alloys have been prepared by mechanical alloying of elemental powders in a planetary ball mill and investigated by X-ray diffraction, differential scanning calorimetry and saturation magnetization measurements. For Co-V, an amorphous phase appears in the central composition range, whereas for Co-Cr and Co-Mn an extended solid solution can be obtained during mechanical alloying. The extent of the glass-forming range is discussed in terms of a thermodynamic approach. The larger the driving force for the interdiffusion reaction the wider the glass-forming range. © 1990.