Observation of an apparent first-order glass transition in ultrafragile Pt-Cu-P bulk metallic glasses.

ABSTRACT: An experimental study of the configurational thermodynamics for a series of near-eutectic Pt80-x Cu x P20 bulk metallic glass-forming alloys is reported where 14 < x < 27. The undercooled liquid alloys exhibit very high fragility that increases as x decreases, resulting in an increasingly sharp glass transition. With decreasing x, the extrapolated Kauzmann temperature of the liquid, T K , becomes indistinguishable from the conventionally defined glass transition temperature, T g For x < 17, the observed liquid configurational enthalpy vs. T displays a marked discontinuous drop or latent heat at a well-defined freezing temperature, T gm The entropy drop for this first-order liquid/glass transition is approximately two-thirds of the entropy of fusion of the crystallized eutectic alloy. Below

SUBMITTER: Na JH 

PROVIDER: S-EPMC7022193 | biostudies-literature | 2020 Feb

REPOSITORIES: biostudies-literature