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T. Masumoto – One of the best experts on this subject based on the ideXlab platform.

  • Soft-Magnetic Properties of Nanocrystalline Fe-Zr-B-Ni Bulk Alloy Produced by Warm Extrusion
    Japanese Journal of Applied Physics, 2014
    Co-Authors: Akinori Kojima, Akihiro Makino, Y. Kawamura, Akihisa Inoue, T. Masumoto

    Abstract:

    Magnetic properties of nanocrystalline Fe90-x Zr7B3Nix ( x=2–4) melt-spun ribbons and consolidated Bulk Alloys have been investigated. The magnetostriction of Fe90-x Zr7B3Nix ribbon changed from -1.8×10-6 to 1.8×10-6 when x changed from 0 to 4 and became zero at x=1.5. Soft-magnetic properties of ribbon and consolidated Bulk Fe90-x Zr7B3Nix were better than those of Fe90Zr7B3. Nanocrystalline Fe86Zr7B3Ni4 consolidated Bulk with grain sizes of 10–20 nm exhibited magnetic flux density of 1.55 T, maximum permeability of 23000, effective permeability of 3360 at 300 Hz, and coercivity of 14 A/m.

  • Soft-magnetic properties of nanocrystalline bcc Fe-(Nb, Zr)-B Bulk Alloys consolidated by warm extrusion
    Materials Transactions Jim, 1995
    Co-Authors: Akinori Kojima, Akihiro Makino, H. Horikiri, Y. Kawamura, Akihisa Inoue, T. Masumoto

    Abstract:

    We obtained Fe 84 Nb 7 B 9 Bulk Alloys by extruding amorphous powders at temperatures (T e ) between 653 and 723 K and pressures (P e ) of 820 to 1210 MPa, and Fe 90 Zr 7 B 3 Bulk Alloys by extruding at T e of 673 to 698 K and P e of 920 to 940 MPa. Subsequent annealing of these Bulk Alloys at 923 K for 3.6 ks causes the formation of a nanocrystalline bcc phase with grain sizes of 9 to 11 nm for Fe 84 Nb 7 B 9 and 20 to 30 nm for Fe 90 Zr 7 B 3 . The bcc Fe 84 Nb 7 B 9 Bulk Alloy exhibits a magnetization (B 800 ) of 1.40 T, a permeability (μ e ) of 1120 at 300 Hz, and a coercive force (H c ) of 48 A/m in the extrusion condition of T e =698 K and P e =870 MPa. Similarly, the B 800 , μ e and H c of the bcc Fe 90 Zr 7 B 3 Bulk Alloy prepared at T e =698 K and P e =923 MPa are 1.57T, 1880 and 29A/m, respectively. The soft-magnetic properties of the bcc Fe 90 Zr 7 B 3 Bulk Alloy are superior to those of the bcc Fe 84 Nb 7 B 9 Bulk Alloy, presumably because of the formation of a more homogeneous bcc structure for the former Alloy.

  • Production of nanocrystalline b.c.c. FeNbB Bulk Alloys by warm extrusion and their magnetic properties
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 1994
    Co-Authors: Akinori Kojima, Akihiro Makino, H. Horikiri, Y. Kawamura, Akihisa Inoue, T. Masumoto

    Abstract:

    Abstract A Bulky Fe 84 Nb 7 B 9 Alloy was obtained by extruding the powders ground from amorphous ribbon, at temperatures T e between 563 K and 723 K at pressures P e between 824 MPa and 1208 MPa and at a speed of 5 mm s −1 . The Bulk Fe 84 Nb 7 B 9 Alloy extruded at T e = 698 K and P e = 1208 MPa is in a fully consolidated state has a density of about 99%. The Bulk Alloy is composed of a mostly single b.c.c. phase with a grain size of about 10 nm after annealing for 3.6 ks at temperatures between 873 K and 973 K, and its soft magnetic property tends to better for the Bulks extruded at lower pressures. The Bulk Alloy extruded at T e = 698 K and P e = 824 MPa exhibits a high saturation magnetization B s of 1.40 T and a low coercive force H c of 64 A m −1 after annealing at 698 K.

Akinori Kojima – One of the best experts on this subject based on the ideXlab platform.

  • Soft-Magnetic Properties of Nanocrystalline Fe-Zr-B-Ni Bulk Alloy Produced by Warm Extrusion
    Japanese Journal of Applied Physics, 2014
    Co-Authors: Akinori Kojima, Akihiro Makino, Y. Kawamura, Akihisa Inoue, T. Masumoto

    Abstract:

    Magnetic properties of nanocrystalline Fe90-x Zr7B3Nix ( x=2–4) melt-spun ribbons and consolidated Bulk Alloys have been investigated. The magnetostriction of Fe90-x Zr7B3Nix ribbon changed from -1.8×10-6 to 1.8×10-6 when x changed from 0 to 4 and became zero at x=1.5. Soft-magnetic properties of ribbon and consolidated Bulk Fe90-x Zr7B3Nix were better than those of Fe90Zr7B3. Nanocrystalline Fe86Zr7B3Ni4 consolidated Bulk with grain sizes of 10–20 nm exhibited magnetic flux density of 1.55 T, maximum permeability of 23000, effective permeability of 3360 at 300 Hz, and coercivity of 14 A/m.

  • Structural and magnetic properties of nanocrystalline fe-rich fe-nb-nd-b sintered magnets produced by consolidating amorphous powders
    IEEE Transactions on Magnetics, 1997
    Co-Authors: Akinori Kojima, Akihiro Makino, A. Inoue

    Abstract:

    Nanocrystalline Bulk Fe88Nb2Nd5B5and Fe86Nb2Nd7B5 Alloys were made by consolidating amorphous powders with an electric-pulse-currentsintering method and subsequent annealing. Bulk Alloy made by consolidating amorphous powders has a higher density (the maximum density could reach 7.5 g/cm3consolidating at 873 K and 636 MPa) than that made by consolidating crystalline powders, presumably because the amorphous Alloy softens around the crystallization temperature. The structure formed after annealing at 1023 K for 180 s shows a nanocrys talline composite consisting of bcc-Fe, Nd2Fe14B and Fe3B or Fe2B phases with grain sizes of 20-40 nm The nanocrystalline Bulk Fe88Nb2Nd5B5Alloy shows hard magnetic properties, remanence (Jr) of 1.05 T, coercive force (H0J) of 263 kA/m, and maximum energy product ((BH)max) of 75 kJ/m3. © 1997 IEEE.

  • Soft-magnetic properties of nanocrystalline bcc Fe-(Nb, Zr)-B Bulk Alloys consolidated by warm extrusion
    Materials Transactions Jim, 1995
    Co-Authors: Akinori Kojima, Akihiro Makino, H. Horikiri, Y. Kawamura, Akihisa Inoue, T. Masumoto

    Abstract:

    We obtained Fe 84 Nb 7 B 9 Bulk Alloys by extruding amorphous powders at temperatures (T e ) between 653 and 723 K and pressures (P e ) of 820 to 1210 MPa, and Fe 90 Zr 7 B 3 Bulk Alloys by extruding at T e of 673 to 698 K and P e of 920 to 940 MPa. Subsequent annealing of these Bulk Alloys at 923 K for 3.6 ks causes the formation of a nanocrystalline bcc phase with grain sizes of 9 to 11 nm for Fe 84 Nb 7 B 9 and 20 to 30 nm for Fe 90 Zr 7 B 3 . The bcc Fe 84 Nb 7 B 9 Bulk Alloy exhibits a magnetization (B 800 ) of 1.40 T, a permeability (μ e ) of 1120 at 300 Hz, and a coercive force (H c ) of 48 A/m in the extrusion condition of T e =698 K and P e =870 MPa. Similarly, the B 800 , μ e and H c of the bcc Fe 90 Zr 7 B 3 Bulk Alloy prepared at T e =698 K and P e =923 MPa are 1.57T, 1880 and 29A/m, respectively. The soft-magnetic properties of the bcc Fe 90 Zr 7 B 3 Bulk Alloy are superior to those of the bcc Fe 84 Nb 7 B 9 Bulk Alloy, presumably because of the formation of a more homogeneous bcc structure for the former Alloy.

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

  • Real time X-ray imaging of soldering processes at the SPring-8 synchrotron
    2017 International Conference on Electronics Packaging (ICEP), 2017
    Co-Authors: K. Nogita, M.a.a. Mohd Salleh, G. Zeng, S.d. Mcdonald, C. Gourlay, H. Yasuda

    Abstract:

    Real time X-ray imaging videos of the entire soldering process for preform solders, solder pastes and BGA solders as well as solder Alloy solidification and microstructure characterisation has been achieved over numerous experiments at the SPring-8 synchrotron. This paper overviews the developments of this challenging technique and provides key findings related to understanding the reliability of solder joints. There are large difference when comparing the microstructures and solidification pathways between soldered Alloys on Cu substrates (Cu-OSP) and Bulk Alloy solidification.

  • Alloy phase formation in nanometer-sized particles
    Materials Science and Engineering A, 2001
    Co-Authors: H Mori, H. Yasuda

    Abstract:

    Alloy phase formation in nanometer-sized particles has been studied by transmission electron microscopy using particles in the Au-Sn system. When tin atoms are vapor-deposited onto nanometer-sized gold particles, rapid dissolution of tin atoms into gold particles takes place, and as a result, particles of an Au-rich solid solution, of a topologically disordered amorphous-like Alloy and of the AuSn compound are formed, depending upon the concentration of tin in a composition range from 0 to 59 at.% Sn. A remarkable enhancement of solubility has been observed in the Au-rich solid solution and the AuSn compound. There is a possibility that the topologically disordered amorphous-like phase, which appears in the middle of a two-phase region (i.e. Au5Sn-AuSn region) of the phase diagram for the Bulk Alloy, is not a non-equilibrium phase. © 2001 Elsevier Science B.V. All rights reserved.