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Michael Feuerbacher – One of the best experts on this subject based on the ideXlab platform.

  • Single-crystal growth of the complex metallic Alloy Phase Mg32(Al,Zn)49
    Intermetallics, 2008
    Co-Authors: Michael Feuerbacher, C. Thomas, Stefan Roitsch
    Abstract:

    Abstract Single crystals of Mg 32 (Al,Zn) 49 , a complex metallic Alloy Phase with 162 atoms per unit cell and a lattice parameter of 14.16 A, were grown by means of the Bridgman and the Czochralski technique. We are able to produce single crystals of high structural quality with volumes of up to 3 cm 3 and a composition of about Mg 36 Al 27 Zn 37 .

  • Single-crystal growth of the complex metallic Alloy Phase β-Al–Mg
    Intermetallics, 2007
    Co-Authors: Marta Lipińska-chwałek, C. Thomas, Stefan Roitsch, S. Balanetskyy, Michael Feuerbacher
    Abstract:

    Abstract The development of a single-crystal growth route for the complex metallic Alloy Phase β-Al3Mg2 is presented. After initial probing of the Phase diagram in the vicinity of the existence range of the β-Phase, we performed single-crystal growth experiments employing various techniques. The Czochralski and self-flux growth turned out to be the most suitable for this Phase, and with both we reproducibly achieved single crystals of several cubic centimeters in volume. While the Czochralski technique allows for the production of deliberately oriented single crystals, the self-flux technique is capable of producing very large but unoriented single grains.

  • Plastic deformation properties of the orthorhombic complex metallic Alloy Phase Al13Co4
    Intermetallics, 2007
    Co-Authors: Marc Heggen, Dewei Deng, Michael Feuerbacher
    Abstract:

    Abstract Plastic deformation experiments were performed on single crystals of the orthorhombic Al 13 Co 4 complex metallic Alloy Phase. The material was compression tested in a temperature range between 873 and 1073 K at a strain rate of 10 −5  s −1 . The stress–strain curves show a pronounced yield-point effect followed by a regime of weak work hardening. Incremental tests, i.e. stress-relaxation tests and temperature changes, were conducted in order to determine thermodynamic activation parameters of the deformation process. After deformation the samples exhibit localised zones of inhomogeneous deformation. Microstructural investigations by means of transmission elecelectron microscopy reveal a high density of dislocation with [010] Burgers vector terminating (001) planar defects. Contrast-extinction experiments show that the Burgers vectors of dislocations as well as the displacement vectors of the planar defects are parallel to the [010] direction. The basic mechanism of plastic deformation is dislocation glide on (001) planes.

Hirotaro Mori – One of the best experts on this subject based on the ideXlab platform.

  • In-situobservation of Alloy Phase formation in nanometre-sized particles in the Sn–Bi system
    Philosophical Magazine, 2004
    Co-Authors: Jung-goo Lee, Hirotaro Mori
    Abstract:

    Alloy Phase formation in nanometre-sized particles has been studied by in-situ transmission elecelectron microscopy using particles in the Sn–Bi system. Observations have been carried out at a temperature (i.e. 350 K) above the eutectic temperature. For tin-rich compositions, with increasing concentration of bismuth, a particle (approximately 8 nm in size) of the terminal tin solid solution changed directly into a particle of the liquid Phase, without going through the stage of solid–liquid coexistence. On the other hand, for bismuth-rich compositions, a particle (approximately 8 nm in size) of the terminal bismuth solid solution changed first to a particle with a crystal–liquid two-Phase microstructure and eventually to a particle of the liquid Phase, with increasing concentration of tin. Thermodynamic model calculations indicate that the contribution of the solid–liquid interfacial energy to the total Gibbs freefree energy of an Alloy particle with a solid–liquid two-Phase microstructure becomes large enough to…

  • Particle-size dependence of Alloy Phase formation in isolated particles in the In-Sn system
    Journal of Vacuum Science & Technology A: Vacuum Surfaces and Films, 2003
    Co-Authors: Jung-goo Lee, Hirotaro Mori
    Abstract:

    Particle-size dependence of Alloy Phase formation in isolated particles has been studied by transmission elecelectron microscopy at room temperature, using Alloy particles in the In–Sn binary system. In approximately 16-nm-sized particles, essentially the same Alloy Phases as those in bulk materials formed. Namely, at compositions near the eutectic composition, a mixture of two crystalline Phases formed. However, when the size of particles was decreased down to approximately 10 nm in diameter, a liquid Phase, which is not an equilibrium Phase in bulk materials at room temperature, formed. The formation of a liquid Phase is ascribed to the large suppression of the eutectic temperature associated with size reduction.

  • IN-SITU OBSERVATION OF Alloy Phase FORMATION IN ISOLATED NANOMETER-SIZED PARTICLES
    Microscopy and Microanalysis, 2002
    Co-Authors: Hirotaro Mori, Jung-goo Lee, Hidehiro Yasuda
    Abstract:

    Alloy Phase formation in isolated nanometer-sized particles has been studied by transmission elecelectron microscopy, using Alloy particles in the Au-Sn, Bi-Sn, and In-Sn binary systems. When the size of particles was decreased down to approximately 10 nm in diameter, a thermodynamically stable amorphous Phase appeared in the former two systems whereas a liquid Phase formed in the latter system. Neither the amorphous nor the liquid Phase is an equilibrium Phase in bulk materials at room temperature. The formation of these Phases at room temperature is ascribed to the large suppression of the eutectic temperature associated with size reduction.

Stefan Roitsch – One of the best experts on this subject based on the ideXlab platform.

  • Single-crystal growth of the complex metallic Alloy Phase Mg32(Al,Zn)49
    Intermetallics, 2008
    Co-Authors: Michael Feuerbacher, C. Thomas, Stefan Roitsch
    Abstract:

    Abstract Single crystals of Mg 32 (Al,Zn) 49 , a complex metallic Alloy Phase with 162 atoms per unit cell and a lattice parameter of 14.16 A, were grown by means of the Bridgman and the Czochralski technique. We are able to produce single crystals of high structural quality with volumes of up to 3 cm 3 and a composition of about Mg 36 Al 27 Zn 37 .

  • Single-crystal growth of the complex metallic Alloy Phase β-Al–Mg
    Intermetallics, 2007
    Co-Authors: Marta Lipińska-chwałek, C. Thomas, Stefan Roitsch, S. Balanetskyy, Michael Feuerbacher
    Abstract:

    Abstract The development of a single-crystal growth route for the complex metallic Alloy Phase β-Al3Mg2 is presented. After initial probing of the Phase diagram in the vicinity of the existence range of the β-Phase, we performed single-crystal growth experiments employing various techniques. The Czochralski and self-flux growth turned out to be the most suitable for this Phase, and with both we reproducibly achieved single crystals of several cubic centimeters in volume. While the Czochralski technique allows for the production of deliberately oriented single crystals, the self-flux technique is capable of producing very large but unoriented single grains.

Hidehiro Yasuda – One of the best experts on this subject based on the ideXlab platform.

  • IN-SITU OBSERVATION OF Alloy Phase FORMATION IN ISOLATED NANOMETER-SIZED PARTICLES
    Microscopy and Microanalysis, 2002
    Co-Authors: Hirotaro Mori, Jung-goo Lee, Hidehiro Yasuda
    Abstract:

    Alloy Phase formation in isolated nanometer-sized particles has been studied by transmission electron microscopy, using Alloy particles in the Au-Sn, Bi-Sn, and In-Sn binary systems. When the size of particles was decreased down to approximately 10 nm in diameter, a thermodynamically stable amorphous Phase appeared in the former two systems whereas a liquid Phase formed in the latter system. Neither the amorphous nor the liquid Phase is an equilibrium Phase in bulk materials at room temperature. The formation of these Phases at room temperature is ascribed to the large suppression of the eutectic temperature associated with size reduction.

  • Alloy Phase formation in nanometer-sized particles in the In-Sn system
    Physical Review B, 2002
    Co-Authors: Jung-goo Lee, Hirotaro Mori, Hidehiro Yasuda
    Abstract:

    Department of Mechanical Engineering, Kobe University, Rokkodai, Nada, Kobe 657-8501, Japan~Received 6 September 2001; revised manuscript received 10 December 2001; published 27 March 2002!Alloy Phase formation in the In-Sn binary system has been studied as a function of the particle size byin situtransmission electron microscopy at room temperature. In approximately 16-nm-sized particles, Alloy Phasesformed were essentially the same as for those in bulk material. However, in particles less than approximately10 nm in size, the formation of a liquid Phase, which is not an equilibrium Phase in bulk at room temperature,was confirmed. The formation of the liquid Phase can be ascribed to the large suppression of the eutectictemperature associated with the size reduction.DOI: 10.1103/PhysRevB.65.132106 PACS number~s!: 64.70.2p

Jung-goo Lee – One of the best experts on this subject based on the ideXlab platform.

  • In-situobservation of Alloy Phase formation in nanometre-sized particles in the Sn–Bi system
    Philosophical Magazine, 2004
    Co-Authors: Jung-goo Lee, Hirotaro Mori
    Abstract:

    Alloy Phase formation in nanometre-sized particles has been studied by in-situ transmission electron microscopy using particles in the Sn–Bi system. Observations have been carried out at a temperature (i.e. 350 K) above the eutectic temperature. For tin-rich compositions, with increasing concentration of bismuth, a particle (approximately 8 nm in size) of the terminal tin solid solution changed directly into a particle of the liquid Phase, without going through the stage of solid–liquid coexistence. On the other hand, for bismuth-rich compositions, a particle (approximately 8 nm in size) of the terminal bismuth solid solution changed first to a particle with a crystal–liquid two-Phase microstructure and eventually to a particle of the liquid Phase, with increasing concentration of tin. Thermodynamic model calculations indicate that the contribution of the solid–liquid interfacial energy to the total Gibbs free energy of an Alloy particle with a solid–liquid two-Phase microstructure becomes large enough to…

  • Particle-size dependence of Alloy Phase formation in isolated particles in the In-Sn system
    Journal of Vacuum Science & Technology A: Vacuum Surfaces and Films, 2003
    Co-Authors: Jung-goo Lee, Hirotaro Mori
    Abstract:

    Particle-size dependence of Alloy Phase formation in isolated particles has been studied by transmission electron microscopy at room temperature, using Alloy particles in the In–Sn binary system. In approximately 16-nm-sized particles, essentially the same Alloy Phases as those in bulk materials formed. Namely, at compositions near the eutectic composition, a mixture of two crystalline Phases formed. However, when the size of particles was decreased down to approximately 10 nm in diameter, a liquid Phase, which is not an equilibrium Phase in bulk materials at room temperature, formed. The formation of a liquid Phase is ascribed to the large suppression of the eutectic temperature associated with size reduction.

  • IN-SITU OBSERVATION OF Alloy Phase FORMATION IN ISOLATED NANOMETER-SIZED PARTICLES
    Microscopy and Microanalysis, 2002
    Co-Authors: Hirotaro Mori, Jung-goo Lee, Hidehiro Yasuda
    Abstract:

    Alloy Phase formation in isolated nanometer-sized particles has been studied by transmission electron microscopy, using Alloy particles in the Au-Sn, Bi-Sn, and In-Sn binary systems. When the size of particles was decreased down to approximately 10 nm in diameter, a thermodynamically stable amorphous Phase appeared in the former two systems whereas a liquid Phase formed in the latter system. Neither the amorphous nor the liquid Phase is an equilibrium Phase in bulk materials at room temperature. The formation of these Phases at room temperature is ascribed to the large suppression of the eutectic temperature associated with size reduction.