Abstract
Electron irradiation effects on the phase stability and microstructure change of conventional Zr 66.7Cu 33.3 amorphous alloy and Zr 65.0Al 7.5Cu 27.5 metallic glass were examined. The amorphous phase was unstable under electron irradiation at 298 K and f.c.c.-Zr 2Cu precipitates were formed. Although b.c.t.-Zr 2Cu with coarse grains precipitated from the amorphous phase by thermal annealing, a nanocrystalline structure composed of f.c.c.-Zr 2Cu precipitates and amorphous matrix was obtained by electron irradiation. There was a threshold total dose density for electron irradiation induced crystallization. The density for Zr 65.0Al 7.5Cu 27.5 was larger than that for Zr 66.7Cu 33.3. The b.c.t.-Zr 2Cu precipitates in thermal equilibrium were unstable under electron irradiation and were transformed to f.c.c.-Zr 2Cu through the amorphous phase.
Published Version
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