The effect of Pt-group metal additions on the thermal stability of Fe- and Ni-based glassy alloys

The influence of dilute concentrations (<10 at.%) of Pt-group metals (Re, Ru, Os, Ir, Pd and Pt) on the thermal-stability of melt-spun (Fe or Ni) Si₁₀B₁₂-based amorphous alloys has been investigated by differential scanning calorimetry. The stability of the Fe-based alloys, with the exception of those containing Pd or Pt, can be related to both the electronic and atomic-size differences between solvent and solute metal species, as we observed previously for other solutes from groups IVa–VIa. Addition of Ru, Pd or Pt to glassy NiSi₁₀B₁₂ has little effect on the stability, and no correlation with atomic size or electron concentration could be established.