Formation of metastable Li2Al3Y through rapid solidification processing. Foley, J., C., Perepezko, J., H., & Skinner, D., J. Technical Report 1994. Paper abstract bibtex A microstructure composed of coherent metastable L12 second-phase particles in a matrix of a supersaturated Al solid solution has been produced via rapid solidification processing of AlY alloys. Splat-quenched samples of the nominal compositions Al with 1, 3, 5, and 8 at.% Y and droplet samples made with the droplet emulsion technique were characterized by differential scanning calorimetry (DSC), differential thermal analysis (DTA), scanning electron microscopy, X-ray diffraction (XRD), and transmission electron microscopy. The 5 and 8 at.% Y splat samples exhibit a uniform fine dispersion of coherent metastable L12 second-phase particles with a lattice parameter of 0.4234 nm, while the 1 at.% Y splat sample exhibits a cellular structure. Thermal cycling of splat-quenched A1-3at.%Y showed an exothermic signal on first heating at around 240°C corresponding to the partial decomposition of the metastable structure, with some retained L12 phase structure detectable by XRD following heating of the sample to 550 °C in the DSC. DTA of the droplets revealed undercoolings in excess of 100 °C for the alloy composition range examined. © 1994.
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title = {Formation of metastable Li2Al3Y through rapid solidification processing},
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abstract = {A microstructure composed of coherent metastable L12 second-phase particles in a matrix of a supersaturated Al solid solution has been produced via rapid solidification processing of AlY alloys. Splat-quenched samples of the nominal compositions Al with 1, 3, 5, and 8 at.% Y and droplet samples made with the droplet emulsion technique were characterized by differential scanning calorimetry (DSC), differential thermal analysis (DTA), scanning electron microscopy, X-ray diffraction (XRD), and transmission electron microscopy. The 5 and 8 at.% Y splat samples exhibit a uniform fine dispersion of coherent metastable L12 second-phase particles with a lattice parameter of 0.4234 nm, while the 1 at.% Y splat sample exhibits a cellular structure. Thermal cycling of splat-quenched A1-3at.%Y showed an exothermic signal on first heating at around 240°C corresponding to the partial decomposition of the metastable structure, with some retained L12 phase structure detectable by XRD following heating of the sample to 550 °C in the DSC. DTA of the droplets revealed undercoolings in excess of 100 °C for the alloy composition range examined. © 1994.},
bibtype = {techreport},
author = {Foley, James C. and Perepezko, John H. and Skinner, David J.}
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