Coincidence of collective relaxation anomaly and specific heat peak in a bulk metallic glass-forming liquid

Article

关键词: MODE-COUPLING-THEORY;    INTERMEDIATE SCATTERING FUNCTION;    LENNARD-JONES MIXTURE;    CU-ZR-AL;    NEUTRON-SCATTERING;    SUPERCOOLED LIQUIDS;    PHASE-TRANSITION;    BETA-RELAXATION;    DYNAMICS;    ALLOYS;   

DOI  :  10.1103/PhysRevB.92.024202

来源: SCIE

【 摘 要 】

The study of relaxational behavior of multicomponent metallic liquids still holds the key to understanding and improving the glass-forming abilities of bulk metallic glasses. Herein, we report measurements of the collective relaxation times in a melted bulk metallic glass (LM601 Zr51Cu36Ni4Al9) in the kinetic regime (Q: 1.5-4.0 angstrom(-1)) using quasielastic neutron scattering. The results reveal an unusual slope change in the Angell plots of the collective relaxation time of this metallic liquid around 950 degrees C, beyond the melting point of the material. Specific heat capacity measurement also reveals the presence of a peak around the same temperature. The coincidence is rationalized using Adams-Gibbs theory, and motivates more careful experimental and computational studies of the metallic liquids in the future.

【 授权许可】

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