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  • 2000-2004  (47)
  • 1995-1999  (24)
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  • 1
    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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  • 2
    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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  • 3
    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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  • 4
    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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  • 5
    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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  • 6
    Electronic Resource
    Electronic Resource
    Full strength compacts by extrusion of glassy metal powder at the supercooled liquid state (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 2008-2010 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the production of full strength compacts of metallic glass by warm extrusion of powders at the supercooled liquid state just above the glass transition temperature. The alloy used was Zr65Al10Ni10Cu15 (at. %) which has the lowest viscosity among Zr-based metallic glasses with large supercooled liquid region. The tensile strength and Young's modulus of the glassy powder compacts were 1520 MPa and 80 GPa, respectively, which are similar to that obtained in the as-cast bulk alloy and melt-spun ribbon. This opens up possibilities of producing high strength amorphous alloys with complex shapes. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.114769
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  • 7
    Electronic Resource
    Electronic Resource
    Stress overshoot in stress-strain curves of Zr65Al10Ni10Cu15 metallic glass (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 779-781 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The essential features of the stress overshoot in the stress-strain curves of Zr65Al10Ni10Cu15 (at. %) metallic glass that has a wide supercooled liquid region were revealed. The stress overshoot was dependent on temperature, strain rate, and stress relaxation. During the stretch, a change in strain rate gave rise to stress overshoot or undershoot which was sensitive to the variable quantities in the strain rate. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.119643
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  • 8
    Electronic Resource
    Electronic Resource
    Newtonian to non-Newtonian master flow curves of a bulk glass alloy Pd40Ni10Cu30P20 (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 3665-3667 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The viscosity and flow stress of a bulk Pd40Ni10Cu30P20 alloy glass near the glass transition were measured as a function of temperature and strain rate under compression. The steady-state viscosity of the glass for a given temperature remains constant at low strain rate, then decreases by many orders of magnitude above a critical strain rate. A master curve in term of the viscosity ratio η/ηN and the product ηNε(overdot) has been constructed, where η and ηN are, respectively, the steady-state viscosity and Newtonian viscosity, and ε(overdot) is the strain rate. The flow stress also can be represented in terms of the product ηNε(overdot). The master curves are fitted with a simple stress relaxation of the form 1−exp[−t/λ] with t=ε(overdot)−1. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.122856
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  • 9
    Electronic Resource
    Electronic Resource
    Bulk amorphous alloys with high mechanical strength and good soft magnetic properties in Fe–TM–B (TM=IV–VIII group transition metal) system (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 464-466 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: New bulk amorphous alloys exhibiting a wide supercooled liquid region before crystallization were found in Fe–(Co,Ni)–(Zr,Nb,Ta)–(Mo,W)–B systems. The Tg is as high as about 870 K and the supercooled liquid region reaches 88 K. The high thermal stability of the supercooled liquid enabled the production of bulk amorphous alloys with diameters up to 6 mm. These bulk amorphous alloys exhibit a high compressive strength of 3800 MPa, high Vickers hardness of 1360, and high corrosion resistance. Besides, the amorphous alloys exhibit a high magnetic-flux density of 0.74–0.96 T, low coercivity of 1.1–3.2 A/m, high permeability exceeding 1.2×104 at 1 kHz, and low magnetostriction of about 12×10−6. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.119580
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  • 10
    Electronic Resource
    Electronic Resource
    Nanocrystalline composites with high strength obtained in Zr–Ti–Ni–Cu–Al bulk amorphous alloys (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 340-342 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nanocrystalline composites with the grain size less than 10 nm were produced by annealing of Cu-mold cast Zr70−x−yTixNi10Cu20Aly (X=5–7.5 and Y=10–15 at %) bulk amorphous alloys. The nanostructured alloys show increased tensile strength at the volume fraction of nanoparticles less than 30%. The microstructure of the amorphous alloys was found to contain medium range order (MRO) domains, which uniformly distributed in the amorphous matrix. We suggest that MRO domains provide nucleation sites for precipitation of the primary crystals and lead to the formation of nanocrystalline composites. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.124254
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