Merging of the α and β relaxations and aging via the Johari–Goldstein modes in rapidly quenched metallic glasses

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This paper provides evidence that the physical aging of deeply and rapidly quenched metallic glasses is promoted by the Johari–Goldstein slow β relaxation, resulting in a significant irreversible increase in the mechanical modulus on initial heating. Dynamic mechanical analysis has been used to characterize relaxation phenomena of a strong and a fragile metallic glass. In addition, we can extrapolate the temperature dependence of β- and α-relaxation peaks to higher temperatures and calculate the merging temperature for both types of glasses.