Correlation between the glass-forming ability and activation energy of crystallization for Zr_75−xNi₂₅Al _x metallic glasses

Abstract

The thermal stability and the kinetics of glass transition and crystallization for Zr_75−xNi₂₅Al _x (x = 8–15) metallic glasses were investigated using differential scanning calorimetry (DSC) under continuous heating conditions. The apparent activation energy of glass transition rises monotonously with the Al content increasing; the activation energy of crystallization increases with Al changing from 8at% to 15at%, and then decreases with Al further up to 24at%, which exhibits a good correlation to the thermal stability and the glass-forming ability (GFA). The Zr₆₀Ni₂₅Al₁₅ metallic glass with the largest supercooled liquid region and GFA possesses the highest activation energy of crystallization. The relation between the thermal stability, GFA and activation energy of crystallization was discussed in terms of the primary precipitated phases.

Keywords

metallic glass / thermal stability / glass-forming ability / crystallization kinetics / activation energy

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