Structural basis for supercooled liquid fragility established by synchrotron-radiation method and computer simulation
- WPI Advanced Institute for Materials Research, Tohoku University, Aoba-Ku, Sendai 980-8577 (Japan)
- Institute for Materials Research, Tohoku University, Aoba-Ku, Sendai 980-8577 (Japan)
- European Synchrotron Radiation Facility, 38042, Grenoble (France)
- Joint Institute for Neutron Sciences, Department of Materials Science and Engineering and Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996 (United States)
Metallic melts above the liquidus temperature exhibit nearly Arrhenius-type temperature dependence of viscosity. On cooling below the equilibrium liquidus temperature metallic melts exhibit a non-Arrhenius temperature dependence of viscosity characterized by liquid fragility phenomenon which origin is still not well understood. Structural changes and vitrification of the Pd{sub 42.5}Cu{sub 30}Ni{sub 7.5}P{sub 20} liquid alloy on cooling from above the equilibrium liquidus temperature are studied by synchrotron radiation X-ray diffraction and compared with the results of first-principles calculations. Subsequent analysis of the atomic and electronic structure of the alloy in liquid and glassy states reveals formation of chemical short-range order in the temperature range corresponding to such a non-Arrhenius behavior. The first-principles calculations were applied to confirm the experimental findings.
- OSTI ID:
- 22036695
- Journal Information:
- Journal of Applied Physics, Vol. 110, Issue 4; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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