The influence of quenching procedures on the kinetics of embrittlement in a Fe40Ni40B20 metallic glass

Abstract

The kinetics of mechanical stability (embrittlement), stress relief, and crystallization of Fe₄₀Ni₄₀B₂₀ metallic glassy ribbons obtained by different melt spin quenching processes were investigated. Ribbons made with higher rate of quenching exhibit better mechanical stability over those made with lower quenching rate. The thermal stability, temperatures, and activation energies for crystallization of all ribbons, however, are identical. The rates of stress relief are higher for ribbons made with higher quenching rate. Values of activation energy for stress relief are about the same for all ribbons. These activation energies for stress relief are also close to those values reported for structural relaxation.