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CORRESPONDENCE From our readers SOLVING THE PUZZLE OF EUTECTIC temperature, Hume-Rothery and Anderson COMPOSITIONS WITH ‘MIRACLE GLASSES’ suggested that the eutectic liquid structure must consist of icosahedral 1–5–1–5–1 atomic chains, To the editor — The structural model for which can be decorated in such a way that they metallic glasses published in the October issue of do not have B–B nearest neighbours. However, Nature Materials may account for the observed liquid structures cannot be modelled by non- compositions of binary A B eutectics, which atom-sharing atomic clusters, which necessarily x y occur most frequently at integer values of x result in overall alloy compositions that are and y. In 1935, D. Stockdale suggested that, in different from that of individual clusters. binary alloy phase diagrams, the compositions Hume-Rothery and Anderson themselves of eutectic points should correspond with simple characterized their formulations as “admittedly whole-number ratios of the two kinds of atoms speculative and incomplete” and to my A (solvent > 50 at.%) and B (solute < 50 at.%). knowledge the puzzle regarding frequently There was insuffi cient data to confi rm this occurring eutectic compositions has remained prediction at the time, but in 1960, W. Hume- unresolved. Although not
Nature Materials – Springer Journals
Published: Jan 1, 2005
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