Rapid chemical and topological ordering in supercooled liquid Cu46Zr54

Article

关键词: BULK METALLIC-GLASS;    X-RAY-DIFFRACTION;    MOLECULAR-DYNAMICS;    STRUCTURAL MODEL;    AMORPHOUS-ALLOYS;    FORMING ABILITY;    BINARY;    TRANSITION;   

DOI  :  10.1103/PhysRevB.83.094116

来源: SCIE

【 摘 要 】

Evidence for rapid ordering in a supercooled Cu46Zr54 liquid, obtained from high-energy x-ray diffraction in a containerless processing environment, is presented. Relatively sudden changes were observed in the topological and chemical short-range order near 850 degrees C, a temperature that is 75 degrees C below the liquidus temperature and 465 degrees C above the glass transition temperature. A peak in the specific heat was observed with supercooling, with an onset near 850 degrees C (the same temperature as the onset of ordering) and a maximum near 700 degrees C, consistent with the prediction of a molecular-dynamics calculation using embedded atom potentials. The chemical and topological ordering measured here are in agreement with predictions of a rapid development of chemically ordered icosahedral clusters in the supercooled liquid.

【 授权许可】

Free