Effects of 5%Ni addition on thermal stability and crystallization behavior of Mg₆₅Cu₂₅Tb₁₀ bulk metallic glass

The effects of 5%Ni addition on the glass forming ability, thermal stability and crystallization behavior of Mg₆₅Cu₂₅Tb₁₀ bulk metallic glass were investigated using X-ray diffractometry, differential scanning calorimetry and transmission electron microscopy. The small amount of Ni addition reduces the glass forming ability and thermal stability due to a significant decrease in the crystallization activation energy. Analyses of crystallization kinetics give evidence to the existence of quenched-in nuclei in amorphous Mg₆₅Cu₂₀Ni₅Tb₁₀. Final crystallization products are basically same for Mg₆₅Cu₂₅Tb₁₀ and Mg₆₅Cu₂₀Ni₅Tb₁₀.