Rapid chemical and topological ordering in supercooled liquid Cu46Zr54

TitleRapid chemical and topological ordering in supercooled liquid Cu46Zr54
Publication TypeJournal Article
Year of Publication2011
AuthorsWessels V, Gangopadhyay AK, Sahu KK, Hyers RW, Canepari SM, Rogers JR, Kramer MJ, Goldman AI, Robinson D, Lee JW, Morris JR, Kelton KF
Journal TitlePhysical Review B
Date Published03
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberISI:000288317900004
Keywordsamorphous-alloys, binary, BULK METALLIC-GLASS, forming ability, model, molecular-dynamics, structural, transition, x-ray-diffraction

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.

URL<Go to ISI>://000288317900004http://prb.aps.org/pdf/PRB/v83/i9/e094116
Alternate JournalPhys. Rev. B