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675 results on '"D'Asta M"'

202. Competition between Order and Phase Separation in Au-Ni

Author

Reichert, H., primary, Schöps, A., additional, Ramsteiner, I. B., additional, Bugaev, V. N., additional, Shchyglo, O., additional, Udyansky, A., additional, Dosch, H., additional, Asta, M., additional, Drautz, R., additional, and Honkimäki, V., additional

Published
2005
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238. Structure of liquid Al and Al 67 Mg 33 alloy: comparison between experiment and simulation.

Author

Kramer, M.J., Mendelev, M.I., and Asta, M.

Subjects
AQUEOUS solutions, ALUMINUM-magnesium alloys, SIMULATION methods & models, CHEMICAL structure, MOLECULAR dynamics, SOLID-liquid interfaces, COMPARATIVE studies
Abstract

We report data on the structure of liquid Al and an Al67Mg33alloy obtained from state-of-the-art X-ray diffraction experiments andab initiomolecular dynamics (AIMD) simulations. To facilitate a direct comparison between these data, we develop a method to elongate the AIMD pair correlation function in order to obtain reliable AIMD structure factors. The comparison reveals an appreciable level of discrepancy between experimental and AIMD liquid structures, with the latter being consistently more ordered than the former at the same temperature. The discrepancy noted in this study is estimated to have significant implications for simulation-based calculations of liquid transport properties and solid–liquid interface kinetic properties. [ABSTRACT FROM PUBLISHER]

Published
2014
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245. Little kitty: carrier

Author

Chase, Asta M.

Subjects
Food/cooking/nutrition, General interest
Abstract

While visiting my niece Nancy on a farm near Elyria, Kan., I was sitting on the deck with a bunch of kittens romping nearby. A little girl asked me if [...]

Published
2007

250. On the formation of hierarchically structured L2-NiTiAl type precipitates in a ferritic alloy.

Author

Liebscher, C., Radmilovic, V., Dahmen, U., Asta, M., and Ghosh, G.

Subjects
IRON alloys, HEUSLER alloys, TRANSMISSION electron microscopy, CREEP (Materials), MELTING points, METALLIC composites
Abstract

This study demonstrates a processing sequence used to generate coherent, two-phase L2-NiTiAl/ B2-NiAl precipitates in a ferritic matrix, and documents their microstructural evolution. Dark-field and energy-filtered transmission electron microscopy in combination with energy-dispersive X-ray analysis are used to determine the structure and composition of the different phases in the course of the processing and aging treatment. Through rapid solidification, coherent L2-NiTiAl type precipitates with an internal network of curved, isotropic $$ 1 / 2\langle 100\rangle $$ antiphase boundaries form within the bcc-Fe matrix. The average width of the precipitates in the as-quenched state is 15 nm. During the subsequent aging heat treatment thin, anisotropic B2-NiAl zones are established, resulting in a three-tiered hierarchical microstructure. The L2-NiTiAl precipitates are coherent with the bcc-Fe matrix, while the fine B2-NiAl zones are coherently embedded in the NiTiAl precipitates and aligned along the $$ \langle 100\rangle $$ directions. The L2-NiTiAl parent precipitates have a width of 40 nm in the heat-treated stage and the B2-NiAl zones are 3-7 nm wide. Hence, the addition of Ti to Fe-rich Fe-Ni-Al alloys leads to the formation of coherent L2-NiTiAl precipitates in the bcc-Fe matrix with an internal network of fine, anisotropic B2-NiAl zones arranged in a hierarchical manner. These microstructures are of potential interest for designing and optimizing the mechanical properties of precipitation-strengthened ferritic alloys. [ABSTRACT FROM AUTHOR]

Published
2013
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