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• W124865994 abstract "The ideas and experience relevant to the possible existence and formation of metallic glasses, prior to their discovery by Duwez and students, is surveyed. An essential condition for forming a metallic, or any other type, glass in melt quenching is that the resistance of the liquid to homogeneous crystal nucleation remain high to deep undercooling. It was known well before the Duwez et al. discovery that this resistance actually was very great in pure molten metals and it was thought that such resistance was indicative that crystal nucleation was reconstructive.Following their discovery it was established that metallic glasses exhibited all the accepted manifestations of the glass ↔ melt transition as well as structural relaxation and transformation behavior which were generally quite parallel to that which had been well established for the common nonmetallic glasses. Indeed, the structural models, and the issues concerning their applicability, advanced for metallic glass are closely analogous to those which had emerged from studies of the other glasses.Metallic glasses differ from the common bulk glasses in that their glass temperature, Tg, when scaled with their liquidus temperature, Tl, (Trg = Tg/Tl) rarely exceeds 0.6 so that their exposure requires extremely high melt quenching rates. However, some of the few metallic glasses with Trg >0.6 have been formed at quite low quench rates, e.g. < 102 °/sec. Also formation of metal glass, in contrast with that of many other glasses, apparently requires certain impurity admixtures. The admixture must be such that it will enforce some impurity redistribution during crystallization so that crystal growth will be thermally activated and thereby suppressible by rapid quenching. In addition to their necessary growth restraining role, impurity admixtures may facilitate glass formation by increasing Trg. Since Tg seems to be not strongly dependent on composition, such increase probably is effected mainly through admixture depression of Tl.Metallic glasses have exhibited some quite unique physical behavior such as high mechanical strength, in combination with some ductility and toughness, and when ferromagnetically based, exceptionally soft magnetic responses. However, the emphasis in this presentation is on those properties thought to be generally characteristic of the glassy state of matter." @default.
• W124865994 created "2016-06-24" @default.
• W124865994 creator A5019878908 @default.
• W124865994 date "1986-01-01" @default.
• W124865994 modified "2023-09-27" @default.
• W124865994 title "A COMMENTARY ON THE RECOGNITION AND CHARACTERIZATION OF THE METALLIC GLASS STATE" @default.
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• W124865994 doi "https://doi.org/10.1016/b978-0-08-034334-1.50007-0" @default.
• W124865994 hasPublicationYear "1986" @default.
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