Existence of multiple critical cooling rates which generate different types of monolithic metallic glass.

ABSTRACT: Via fast differential scanning calorimetry using an Au-based glass as an example, we show that metallic glasses should be classified into two types of amorphous/monolithic glass. The first type, termed self-doped glass (SDG), forms quenched-in nuclei or nucleation precursors upon cooling, whereas in the so-called chemically homogeneous glass (CHG) no quenched-in structures are found. For the Au-based glass investigated, the critical cooling and heating rates for the SDG are 500 K s^-1 and 20,000 K s^-1, respectively; for the CHG they are 4000 K s^-1 and 6000 K s^-1. The similarity in the critical rates for CHG, so far not reported in literature, and CHG's tendency towards stochastic nucleation underline the novelty of this glass state. Identifying di

SUBMITTER: Schawe JEK 

PROVIDER: S-EPMC6430809 | biostudies-literature | 2019 Mar

REPOSITORIES: biostudies-literature