Effect of initial nanocrystal on structural stability of Ti₄₀Zr₂₅Ni₈ Cu₉Be₁₈ amorphous alloy

Ti₄₀Zr₂₅Ni₈ Cu₉Be₁₈ bulk alloy with amorphous/nanocrystalline structure was prepared by electromagnetic induce melting-injection casting. Crystallization of amporhous/nanocrystalline alloy during homogeneous deformation was investigated based on comparing with Ti₄₀Zr₂₅Ni₈ Cu₉Be₁₈ alloy with amorphous structure. The results indicate that the existence of initial nanocrystal doesn't decrease the structure stability of amporhous/nanocrystalline alloy during rheologic process in supercooled liquid region. Moreover, the activated energy of amporhous/nanocrystalline alloy is 233.21 kJ/mol, and is roughly equal to that of amorphous alloy. Avrami exponent of amporhous/nanocrystalline alloy ranges from 2 to 0.5, which is lower than that of the amorphous alloy. This indicates that the initial nanocrytal wouldn't promote crystallization.