Electron-irradiation-induced nano-crystallization in quasicrystal-forming Zr-based metallic glass

Abstract

Phase selection in electron-irradiation-induced crystallization and crystal-to-amorphous-to-crystal (C–A–C) transition at 298 K in quasicrystal-forming Zr–Pt metallic glass alloys were investigated. Two types of f.c.c. nano-crystalline precipitates were formed in amorphous Zr 80Pt 20 and Zr 66.7Pt 33.3 alloys under electron irradiation; such unique nano-crystalline structures were not observed during thermal annealing. It was inferred that unique phase selection in electron-irradiation-induced crystallization and thermal crystallization can be explained by the large negative chemical mixing enthalpy (Δ H chem) in Zr–Pd and Zr–Pt alloys.