Separation of glass transition and crystallization in metallic glasses by temperature-modulated differential scanning calorimetry

摘要

The glass transition behaviour of the four metallic glasses La_(55)Al_(25)Ni_(20), Zn_(65)Mg_(35), and Nd_(60)Fe_(30)Al_(10) and Zr_(30)Y_(30)Al_(15)Ni_(25) has been studied by temperature-modulated differential scanning calorimetry (MDSC). It is clearly demonstrated that the glass transition can be separated from crystallization by MDSC. Two glass transitions have been observed for Zn_(65)Mg_(35), Nd_(60)Fe_(30)Al_(10) and Zr_(30)Y_(30)Al_(15)Ni_(25). Owing to the clearer observation of the glass transition, calculation of the reduced glass temperatures T_(rg) (glass transition temperature divided by the melting point) can now be made with greater confidence.