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  • Electronic Resource  (170)
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  • Electronic Resource  (170)
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  • 1
    Electronic Resource
    Electronic Resource
    Soft magnetic properties of nanocrystalline bcc Fe-Zr-B and Fe-M-B-Cu (M=transition metal) alloys with high saturation magnetization (invited) : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6232-6237 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A mostly single bcc phase with nanoscale grain sizes of 10 to 20 nm was found to form by annealing amorphous Fe-Zr-B, Fe-Hf-B, and Fe-M-B-Cu(M=Ti, Zr, Hf, Nb, and Ta) alloys for 3.6 ks in the range of 723 to 923 K. The high permeability (μe) above 10 000 at 1 kHz combined with high saturation magnetization (Bs) above 1.5 T was obtained for the bcc alloys. The highest μe and Bs values reach 14 000 and 1.7 T for Fe91Zr7B2, 20 000 and 1.55 T for Fe87Zr7B5Cu1, and 48 000 and 1.52 T for Fe86Zr7B6Cu1. Magnetostriction (λs) decreases significantly by the phase transition from amorphous to bcc phase and is measured to be 1 × 10−6 for the bcc Fe86Zr7B6Cu1 alloy. The small λs as well as the small grain size is concluded to be the reason for the good soft magnetic properties. The lattice parameter of this bcc phase is 0.2870 nm being larger than that of pure α-Fe. The small λs seems to be achieved by the dissolution of solute elements above an equilibrium solubility limit. The bcc Fe86Zr7B6Cu1 alloy also shows the low core loss of 0.066 W/kg at 1 T and 50 Hz, which is considerably smaller than that of amorphous Fe78Si9B13 and bcc Fe-3.5mass%Si alloys in practical uses as core materials in transformer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350006
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  • 2
    Electronic Resource
    Electronic Resource
    The formation of decagonal and icosahedral phases in Al75−xPd25Crx (x 〈3 at.%) quasicrystals (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 2728-2730 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An Al75Pd25 decagonal (D) phase changes to an F-type icosahedral (I) phase by the substitution of 3 at. % Cr for Al in a rapidly solidified state. The coexisting I and D phases in a rapidly solidified Al73Pd25Cr2 alloy have a close orientation relationship, in which a tenfold axis of the D phase coincides with a fivefold axis of the I phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348627
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  • 3
    Electronic Resource
    Electronic Resource
    New Fe-based amorphous alloys with large magnetostriction and wide supercooled liquid region before crystallization (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 4491-4493 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A glass transition, followed by a supercooled liquid region was found in wide composition ranges of 0–65 at % Co and 1.5–7 at % Ln in Fe80−x−yCoxLnyB20 (Ln=Nd, Sm, Tb, or Dy) amorphous alloys. The supercooled liquid region (ΔTx) shows the largest value of 41 K for the Fe47Co30Sm3B20 alloy. An internal equilibrium state leading to the disappearance of the previous thermal history was achieved within a temperature interval of 15 K. The Fe–Co–Ln–B amorphous alloys exhibit soft ferromagnetism with saturated magnetization (Bs) of 0.84–1.66 T and coercivity (Hc) of 5.0–36 A/m. A high magnetostriction (λs) exceeding 40×10−6 was also observed in the composition range of 0–10 at % Co and 1.5–3 at % Ln (Ln=Sm, Tb, or Dy). The highest λs reaches 58×10−6 for Fe68.5Co10Ln1.5B20 (Ln=Sm or Tb), which is higher than the highest value (44×10−6) for previously reported amorphous alloys. All the Fe68.5Co10Ln1.5B20 amorphous alloys have good bending ductility. The tensile strength, Vickers hardness and Young's modulus of the Fe68.5Co10Sm1.5B20 alloy are 3220 MPa, 990 and 76.5 GPa, respectively. The combination of high λs, high Bs, low Hc, large ΔTx, good ductility and high mechanical strength is promising a new type of ferromagnetic bulk amorphous alloy. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370385
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  • 4
    Electronic Resource
    Electronic Resource
    Fabrication of nanocrystalline Fe86Zr7B6Cu1 soft-magnetic compacts with high saturation magnetization (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 5545-5551 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Soft-magnetic cores with nanoscale bcc structure were fabricated by consolidation of amorphous or nanocrystalline Fe86Zr7B6Cu1 (at. %) powder using a hot-pressing machine. The most appropriate process to fabricate nanocrystalline Fe86Zr7B6Cu1 soft-magnetic compacts with high density is the direct consolidation of the amorphous powder into nanocrystalline compacts. This process is superior to the annealing method of the amorphous compacts produced from the amorphous powder. The main reason is that the former process fully utilizes the low viscosity of the amorphous alloy before the crystallization temperature. On the other hand, the consolidation of the nanocrystalline powder prepared by annealing of the amorphous powder is an unsuitable process because of the lack of the decrease in viscosity. The nanocrystalline Fe86Zr7B6Cu1 compact obtained by pressing the amorphous powder for 200 s at 853 K and 1.5 GPa has a high density of 99.9% of the theoretical density and exhibits good soft-magnetic properties. The saturation magnetization Bs, coercive force Hc, maximum permeability μmax, effective permeability μe at 1 kHz and 0.8 A/m, and core loss Wh at 10 kHz and 0.1 T are 1.56 T, 33 A/m, 4300, 1300, and 37 W/kg, respectively. It is therefore established that the present compact possesses good soft-magnetic properties combined with high magnetization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357157
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  • 5
    Electronic Resource
    Electronic Resource
    High-frequency permeability of (Fe, Co, Ni)62Nb8B30 amorphous alloys with a wide supercooled liquid region (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 2510-2512 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The increase in B content to 30 at. % for Fe–Co–Ni–Nb–B amorphous alloys caused an extension of a supercooled liquid region before crystallization, and a wide supercooled liquid region greater than 80 K was obtained in a wide composition range of 5–42 at. % Co and 0–10 at. % Ni for Fe62−x−yCoxNiyNb8B30 amorphous alloys. High B-containing amorphous alloys with low Ni content below 10 at. % have high electrical resistivity above 230 μΩ cm and exhibit good soft magnetic properties, i.e., a low coercive force of 2 A/m, low saturated magnetostriction of 2–7×10−6, and high permeability of 21 000–29 300 at 1 kHz and 5000–7500 at 1 MHz. The high-frequency permeability characteristics at 1 MHz are much better than those for any kind of soft magnetic materials, and have been presumed to result from the decrease in eddy current loss caused by the increase in electrical resistivity. The synthesis of the Fe–Co–Nb–B amorphous alloys exhibiting a wide supercooled liquid region greater than 80 K and high-frequency permeability of 7500 at 1 MHz is promising for future development as a type of soft magnetic material. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.123023
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  • 6
    Electronic Resource
    Electronic Resource
    Ferromagnetic Co–Fe–Zr–B amorphous alloys with glass transition and good high-frequency permeability (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 744-746 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A Co-based amorphous phase with glass transition and supercooled liquid region before crystallization was formed in Co70−xFexZr10B20 and Co72−xFexZr8B20 alloys containing more than 14 at % Fe. The crystallization temperature (Tx) is 899 K for the Co–Zr–B alloys and remains unchanged in the Fe concentration range up to 20%. The glass transition temperature (Tg) decreases with increasing Fe content, and the ΔTx(=Tx−Tg) increases from 25 K at 14% Fe to 34 K at 21% Fe. The amorphous alloys with glass transition crystallize with a single stage precipitation of bcc Fe(Co) and Co3ZrB2 phases. The Co-rich amorphous alloys exhibit good soft magnetic properties, i.e., saturation magnetization of 0.58–0.83 T, low coercivity of 4.7–8.3 A/m, and high permeability of 5500–18 300 in the frequency range of 1–103 kHz and low magnetostriction between −1.5×10−6 and +10×10−6 including zero. The success in synthesizing the soft magnetic amorphous alloys with high stability of supercooled liquid is promising for the future development of ferromagnetic Co-based bulk amorphous alloys. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.121987
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  • 7
    Electronic Resource
    Electronic Resource
    Deformation behavior of Zr65Al10Ni10Cu15 glassy alloy with wide supercooled liquid region (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 1208-1210 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the stress-strain behavior for a Zr65Al10Ni10Cu15 (at.%) glassy alloy with a significant supercooled liquid region of 105 K. The transition temperature from inhomogeneous deformation to a homogeneous one increases with increasing strain rate. The alloy in the supercooled liquid state, however, exhibited the homogeneous deformation even at higher strain rates above 0.5 s−1. The strength was also dependent on the strain rate and independent of temperature in the inhomogeneous deformation region, and was sensitive to both strain rate and temperature in the homogeneous region. The stress-strain curves in the homogeneous deformation mode were accompanied by a stress overshoot and its height increases with increasing temperature and strain rate. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.117413
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  • 8
    Electronic Resource
    Electronic Resource
    New bulk amorphous Fe–(Co,Ni)–M–B (M=Zr,Hf,Nb,Ta,Mo,W) alloys with good soft magnetic properties : The 7th joint MMM-intermag conference on magnetism and magnetic materials (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 6326-6328 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have found that an amorphous phase with a wide supercooled liquid region reaching 85 K before crystallization is formed in Fe–(Co, Ni)–(Zr, Nb, Ta)–B, Fe–Co–(Zr, Nb)–(Mo, W)–B and Co–Fe–Zr–B systems. The high stability of the supercooled liquid enabled the production of bulk amorphous alloys with diameters up to 5 mm by copper mold casting. These amorphous Fe–(Co, Ni)–M–B alloys exhibit good soft magnetic properties, i.e., saturation magnetization of 0.95 to 1.1 T, low coercivity of 1 to 8 A/m, Curie temperature of 560 to 590 K and low magnetostriction of 8–14×10−6. The effective permeability of the Co–based alloys exceeds 25 000 at 1 kHz and keeps high values above 5000 at the high frequency of 1 MHz. The permeability at 1 MHz is much higher than those for any kinds of soft magnetic materials. The frequency at which the imaginary part of permeability shows a maximum is also about 1 MHz. The success of synthesis of new Fe- and Co-based amorphous alloys with good soft magnetic properties and high glass-forming ability is promising for future development of a new type of soft magnetic material. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.367811
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  • 9
    Electronic Resource
    Electronic Resource
    Some novel melt-spun superconducting materials (abstract) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 4215-4215 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new class of Fe-, Co-, Ni-, Cu-, and Ge-based ductile ribbons in which an amorphous matrix containing less than 12 vol. % of a fine dispersion of 0.1–3-μm size particles of immiscible elements M=Pb, Bi, Sn, or In have been produced by a modified melt-quenching technique. The Fe- and Co-based alloys containing Bi and Pb are found to be ferromagnetic above room temperature and also superconducting at temperatures in a range 7–9 K depending on the alloy. The saturation magnetization in these usual alloys range from 92 emu/gm for Co-Si-B-Pb-Bi to 15 emu/g for Fe-P-Pb-Bi at 77 K. At the superconducting transition the resistivity typically is found to drop by 2–3 orders of magnitude with a transition width ∼0.5 K before the "zero'' resistance value is reached. In all the alloys studied the T dependence of the resistivity shows a typical metallic behavior despite its high magnitude (a few thousand μΩ cm in some cases). Extremely high values are found for the upper critical fields (1.6–1.72 T at 4.2 K) with critical current densities typically around 1.3×107 A m−2 at 4.2 K. For Ge-Pb-Bi-Sn Hc2 values of 5 T are obtained at 3 K. Along with detailed studies of magnetic and superconducting properties, extensive TEM, and x-ray characterization data will also be presented. Attempts to explain the above described behavior in terms of proximity, percolation, and surface properties at the dispersed Pb, Bi particles are found to be unsatisfactory. As far as we know there exists no theory that can explain the co-existence of ferromagnetism and superconductivity of the type described above. Time permitting, we will also discuss our recent work on high Tc oxide materials produced by melt-quenching techniques. Thus amorphous composite materials exhibiting unique and useful characteristics which cannot be achieved for homogeneous amorphous alloys can be produced by melt quenching. These materials are of importance both for scientific and engineering points of view.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340236
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  • 10
    Electronic Resource
    Electronic Resource
    Crystallization on supercooled liquid in metallic Zr-Cu-Al glasses (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 137-139 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Crystallization behaviors are isothermally examined on supercooled-liquid and amorphous states in metallic Zr-Al-Cu glasses using differential scanning calorimetry. On the basis of a kinetic analysis, it is examined that the crystallization occurs with a zero nucleation rate below the glass transition temperature Tg and a nearly steady-state nucleation rate above Tg. Arrhenius relation between effective time lag τ of nucleation and isothermal temperature appears as a curvature for alloys revealing a wide supercooled liquid region and a straight line for alloys without wider supercooled-liquid region. The differences are attributed to the effects of viscosity on nucleation at supercooled liquid. The difference in morphology during crystallization between amorphous and supercooled-liquid states was also confirmed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.109350
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