Abstract
The effect of pre-treatment above glass transition temperature ( T g) on the reversible structural relaxation in a Zr 62Al 8Ni 13Cu 17 bulk metallic glass at sub- T g annealing has been investigated. It is found that the enthalpy relaxation can be well described by a stretched exponential function. A free-volume model can only qualitatively simulate the process of enthalpy recovery. Sub- T g heat treatments after enthalpy recovery have almost no effect on the following crystallization, which can be accelerated when critical clusters are formed for a longer time annealing.
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