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  • 2000-2004  (47)
  • 1990-1994  (18)
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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
    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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  • 4
    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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  • 5
    Electronic Resource
    Electronic Resource
    On the growth of nanocrystalline grains in an aluminum-based amorphous alloy (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 2644-2646 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have identified a growth process of nanocrystalline grains in amorphous Al87Ni10Ce3 by means of differential scanning calorimetry and transmission electron microscopy. The grain size of the final grown Al was estimated to be ∼15 nm. A typical nucleation-growth process was observed during the transformation in an amorphous Al85Ni10Ce5. The grain growth process was only observed in Al-enriched alloys (Al (approximately-greater-than) 87 at. %), indicating that the nuclei pre-existed in an Al-enriched area in the original amorphous state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110407
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  • 6
    Electronic Resource
    Electronic Resource
    Effects of Nb addition on icosahedral quasicrystalline phase formation and glass-forming ability of Zr–Ni–Cu–Al metallic glasses (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 1024-1026 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This work shows that the crystallization process of Zr–Ni–Cu–Al metallic glass is greatly influenced by adding Nb as an alloying element. Based on the results of the differential scanning calorimetry experiments for metallic glasses Zr69−xNbxNi10Cu12Al9 (x=0–15 at. %), the crystallization process takes place through two individual stages. For Zr69Ni10Cu12Al9 (x=0), metastable hexagonal ω-Zr and a small fraction of tetragonal Zr2Cu are precipitated upon completion of the first exothermic reaction. Contrary to this alloy, the precipitation of a nanoquasicrystalline phase is detected when 5–10 at. % Nb is added. Furthermore, the crystallization temperature Tx, supercooled liquid region ΔTx and reduced temperature Tg/TL (Tg is the glass transition temperature, TL the liquidus temperature) increase with increasing Nb content. These results indicate that adding Nb content to Zr–Ni–Cu–Al metallic glasses not only induces quasicrystalline phase formation, but also enhances glass-forming ability. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1391396
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  • 7
    Electronic Resource
    Electronic Resource
    Investigation of short-range order in nanocrystal-forming Zr60Cu20Pd10Al10 metallic glass and the mechanism of nanocrystal formation (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 1792-1794 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Rapidly solidified ribbons from the nanocrystal-forming Zr60Cu20Pd10Al10 alloy prepared at various melting liquid temperatures were used to study the influence of the liquid state upon quenched-in nuclei. With lowering quenching liquid temperatures, the small-angle x-ray scattering shows increased related periodic composition fluctuations and the radial distribution function analysis from x-ray diffraction method reveals that the coordination number of Pd around Zr increases. These results provide evidence for the stronger attractive interaction in Zr–Pd, which exhibits large negative mixing enthalpy, leads to the formation of (Zr, Pd)-rich domains of short-range order in the liquid. They remain in the amorphous phase as quenched-in nuclei and therefore contribute to nanocrystalline formation. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1404128
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  • 8
    Electronic Resource
    Electronic Resource
    Strong influence of supercooled liquid on crystallization of the Al85Ni5Y4Nd4Co2 metallic glass (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 78 (2001), S. 3061-3063 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The present letter aims to report the effect of supercooled liquid region on crystallization behavior of an Al85Ni5Y4Nd4Co2 metallic glass produced by rapid solidification of the melt. It is found that crystallization behaviors of this alloy above and below the glass-transition temperature are completely different. Formation of the primary nanoscale α-Al particles observed during continuous heating or after annealing above glass-transition temperature does not occur during isothermal annealing below glass-transition temperature when an unidentified intermetallic compound, and α-Al phases are formed simultaneously. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1371795
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  • 9
    Electronic Resource
    Electronic Resource
    Ductility of bulk nanocrystalline composites and metallic glasses at room temperature (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 46-48 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Mechanical properties of bulk Zr60Cu20Pd10Al10 nanocrystalline composite and Zr55Ni5Cu30Al10 metallic glass were measured by compression tests at room temperature. The Zr60Cu20Pd10Al10 as-quenched alloy obviously exhibits plastic strain while no distinct plastic deformation is recognized in the Zr55Ni5Cu30Al10 metallic glass. Moreover, the plastic strain increased by increasing the volume fraction of nanocrystals and achieved maximum value in the early stage of the nanocrystallization. High-resolution electron microscopy showed that, different from the microstructure of Zr55Ni5Cu30Al10 metallic glass, nanocrystals with main grain sizes of about 2 nm were embedded in the amorphous matrix of the bulk Zr60Cu20Pd10Al10 alloy which showed the maximum plastic strain. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.126872
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  • 10
    Electronic Resource
    Electronic Resource
    Electronegativity of the constituent rare-earth metals as a factor stabilizing the supercooled liquid region in Al-based metallic glasses (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 3410-3412 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The letter describes influence of the electronegativity of the constituent rare-earth metals on the supercooled liquid region in the Al–(Gd, Dy or Er)–Ni–Co metallic glasses. The samples were studied by x-ray diffractometry and differential scanning calorimetry. Calorimetry data for the La and Sm—bearing glasses studied earlier were also taken in consideration for comparison. It is found that supercooled liquid range in the Al85RE8Ni5Co2 alloys strongly depends upon electronegativity of the RE metal. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1420781
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