Electron Irradiation Induced Phase Transformation in Zr_(66.7)Cu_(33.3) and Zr_(66.7)Pd_(33.3) Metallic Glass

摘要

Crystallization and phase selection in Zr_(66.7)Cu_(33.3) and Zr_(66.7)Pd_(33.3) metallic glass during thermal annealing and electron irradiation were examined. During thermal annealing an equilibrium C11_b -Zr_2Cu phase directly precipitated in the amorphous phase of Zr_(66.7)Cu_(33.3) metallic glass while a thermal equilibrium C11_b-Zr-2Pd phase formed after icosahedral quasi-crystalline phase precipitation in Zr_(66.7)Pd_(33.3) metallic glass. The amorphous phase was not stable under electron irradiation and metastable crystalline phases with face-centered cubic-based structure formed in both kinds of metallic glass by electron irradiation induced crystallization. The unique phase selection in electron irradiation induced crystallization is due to a change in the phase stability of crystal, quasi-crystal and amorphous phase under electron irradiation.