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Evidence for cooling‐rate‐dependent icosahedral short‐range order in a Cu–Zr–Al metallic glass
Author(s) -
Hermann Helmut,
Kühn Uta,
Wendrock Horst,
Kokotin Valentin,
Schwarz Björn
Publication year - 2014
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s1600576714021232
Subject(s) - icosahedral symmetry , materials science , diffraction , amorphous metal , metal , thermal , range (aeronautics) , crystallography , slow cooling , short range order , thermodynamics , analytical chemistry (journal) , metallurgy , chemistry , alloy , composite material , optics , physics , chromatography
Samples of Cu 47.5 Zr 47.5 Al 5 metallic glass were prepared at different cooling rate, R . The dependence of the X‐ray diffraction patterns on R was analysed by comparing them with corresponding patterns of computer‐simulated models generated at different cooling rates as well. The observed changes in the experimental diffraction patterns are reproduced by the simulations, showing an increasing fraction of icosahedral clusters with decreasing cooling rate. The difference of the fractions of icosahedrally coordinated atoms in mould‐cast and rapidly quenched Cu 47.5 Zr 47.5 Al 5 averages to 3 (1)%. Different frozen‐in thermal displacements and different density are ruled out as a possible origin for the experimental observations.