Abstract
Nonlinear viscoelasticity influenced by an in situ nanocrystallization under constant load compression at the glass transition temperature, Tg, is investigated with a Cu 6 0 Zr 3 0 Ti 1 0 (at %) bulk metallic glass (BMG). The experimental curves showed the characteristics, softening and subsequent recovering phenomena which have been observed in a 'stable' Zr-based BMG and also hardening through whole deformation process due to the in situ nanoprecipitation in the glass matrix. These characteristics are fairly reproduced by the fictive stress model extended by the Johnson-Mehl-Avrami (JMA) equation and mixture rule for respectively expressing influences of the Newtonian viscosity and of Young's modulus and critical stress on volume fraction of the nanoprecipitates.
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