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Your search keyword '"[ CHIM.MATE ] Chemical Sciences/Material chemistry"' showing total 2 results
Start Over Descriptor "[ CHIM.MATE ] Chemical Sciences/Material chemistry" Journal journal of alloys and compounds
2 results on '"[ CHIM.MATE ] Chemical Sciences/Material chemistry"'

1. High cooling rate cells, dendrites, microstructural spacings and microhardness in a directionally solidified Al–Mg–Si alloy

Author

Noé Cheung, Nathalie Mangelinck-Noël, Crystopher Brito, Guillaume Reinhart, Amauri Garcia, José E. Spinelli, Henri Nguyen-Thi, Department of manufacturing and materials engineering, University of Campinas - UNICAMP, Institut des Matériaux, de Microélectronique et des Nanosciences de Provence ( IM2NP ), Aix Marseille Université ( AMU ) -Université de Toulon ( UTLN ) -Centre National de la Recherche Scientifique ( CNRS ), Department of Materials Engineering, Federal University of Sao Carlos, UFSCar, Institut des Matériaux, de Microélectronique et des Nanosciences de Provence (IM2NP), Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU), Aix Marseille Université (AMU)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), and Universidade Federal de São Carlos [São Carlos] (UFSCar)

Subjects
Materials science, Mechanical Engineering, Metallurgy, Alloy, Metals and Alloys, Analytical chemistry, Intermetallic, [CHIM.MATE]Chemical Sciences/Material chemistry, Cooling rates, engineering.material, Microstructure, Indentation hardness, Solidification, Cooling rate, Hardness, Mechanics of Materials, [ CHIM.MATE ] Chemical Sciences/Material chemistry, Unidirectional solidification, Materials Chemistry, engineering, Dendritic / cellular transition
Abstract

International audience; Transient unidirectional solidification experiments have been carried out with an Al–3 wt%Mg–1 wt%Si alloy under cooling rates (T_ ) in the range 0.2–45 K/s. A reverse cells > dendrites transition is shown to occur with the high-cooling rate cellular region associated with T_ > 2 K/s and the dendritic region with T. < 0.8 K/s. Experimental growth laws correlating the cellular and dendritic spacings with the cooling rate are proposed. It is shown that the microhardness is directly influenced by both morphologies of the Al-rich matrix and by the relative fractions of Mg2Si and Fe bearing intermetallics that vary differently with the cooling rate.

Published
2015
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2. Correlation between milling parameters and microstructure characteristics of nanocrystalline copper powder prepared via a high energy planetary ball mill

Author

Frédéric Bernard, A.I. Ustinov, Eric Gaffet, O. Boytsov, Laboratoire de Recherche sur la Réactivité des Solides ( LRRS ), Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS ), Institut de Recherches sur les Archéomatériaux ( IRAMAT ), Université de Technologie de Belfort-Montbeliard ( UTBM ) -Université d'Orléans ( UO ) -Université Bordeaux Montaigne-Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Recherche sur la Réactivité des Solides (LRRS), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les Archéomatériaux (IRAMAT), and Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Université Bordeaux Montaigne-Université de Technologie de Belfort-Montbeliard (UTBM)

Subjects
Materials science, 02 engineering and technology, Edge (geometry), 01 natural sciences, High Energy Physics::Theory, Condensed Matter::Materials Science, Condensed Matter::Superconductivity, Powder metallurgy, 0103 physical sciences, Materials Chemistry, Ball mill, ComputingMilieux_MISCELLANEOUS, 010302 applied physics, Mechanical Engineering, Metallurgy, Metals and Alloys, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Microstructure, Nanocrystalline material, Shock (mechanics), Mechanics of Materials, [ CHIM.MATE ] Chemical Sciences/Material chemistry, Crystallite, Dislocation, 0210 nano-technology
Abstract

The microstructure evolution of Cu-nanostructured powders versus the ball milling conditions was investigated by whole peak profile powder pattern modeling method. This method allows defining in some approach the characteristics of as-milled Cu powder microstructure in terms of crystallite size, type and density of dislocations and twin faults density. It is shown that the change of microstructure characteristics of as-milled Cu powder versus the ball milling conditions (under constant time of the ball milling) depend on only some energy parameters of the milling, for example, average size of crystallite is uniquely defined by energy of the shock, whereas the portion of edge and screw components of dislocation structures depend on a ratio between normal and tangential components of shock.

Published
2007
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