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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 12 (1990), S. 587-595 
    ISSN: 0392-6737
    Keywords: Amorphous materials ; glasses ; Solubility segregation ; mixing ; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Diagrammi di energia libera di leghe amorfe sono costruiti usando un modello semiempirico di Miedema di calori di formazione. Questi diagrammi tengono conto dell'intervallo sperimentale di concentrazione che forma il vetro i leghe binarie di metalli di transizione. Uno dei fattori principali che controllano la formazione di vetro è il contributo elastico al calore di mescolanza della fase di soluzione solida. Diagrammi di energia libera di questo tipo sono anche utili per interpretare alcuni processi caratteristici che avvengono nei sistemi amorfi, come la vetrificazione spontanea osservata da Van Allmen e collaboratori in molte leghe basate su Ti e Nb.
    Abstract: Резюме Используя полуэмпическую модель Миедема теплоты образования, конструируются диаграммы свободной энергии для аморфных сплавов. Эти дизграммы обьясняют экспериментальную концентрационную область образования стекла в бинарных сплавах переходных металлов. Один из основных факторов, контролирующих образование стекла, представляет упругнй вклад в теплоту смешивания фазы твердого раствора. Диаграммы свободной энергии этого типа также полезны для интерпретации некоторых характеристических процессов, происходящих в аморфных системах, таких как спонтанное стеклование, наблюденное фон Амменом и сотрудниками в некоторых сплавах на основе титана и на основе ниобия.
    Notes: Summary Free-energy diagrams of amorphous alloys are constructed using Miedema's semiempirical model of heats of formation. These diagrams account for the experimental glass-forming concentration range in binary alloys of transition metals. One of the main factors controlling glass formation is the elastic contribution to the heat of mixing of the solid solution phase. Free-energy diagrams of this kind are also useful for interpreting some characteristic processes occurring in amorphous systems, such as the spontaneous vitrification observed by Von Allmen and coworkers in several Ti-based and Nb-based alloys.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The amorphization of Mg-Cu-Sn alloys with various compositions has been studied using the melt-spinning technique, with particular emphasis on the magnesium-rich corner of the ternary phase diagram. The results have been interpreted in terms of Miedema's theory, which highlights competition between the amorphous phase and crystalline solid solutions. Competition by ordered intermetallic compounds has also to be considered in order to explain the restricted amorphization region found in these experiments.
    Type of Medium: Electronic Resource
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