Preparation and Thermal Stability of Bulk Amorphous Pd&lt;SUB&gt;40&lt;/SUB&gt;Cu&lt;SUB&gt;30&lt;/SUB&gt;Ni&lt;SUB&gt;10&lt;/SUB&gt;P&lt;SUB&gt;20&lt;/SUB&gt; Alloy Cylinder of 72 mm in Diameter

Inoue, Akihisa; Nishiyama, Nobuyuki; Kimura, Hisamichi

doi:10.2320/matertrans1989.38.179

Cited by 336 publications

(148 citation statements)

References 24 publications

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“…Since 1988, various kinds of bulk amorphous alloys in Mg-, Ln-, Zr-, Ti-, Fe-, Pd-Cu-, Co-and Ni-based systems were developed [1,2]. The lowest R c is 0.10 K/s [25] and the largest t max approaches nearly 100 mm [26]. There is a clear tendency for the glass-forming ability to increase with increasing T g /T m .…”

Section: S C I E N C E a N D T E C H N O L O G Y O F Advanced Materialsmentioning

confidence: 98%

High-strength Zr-based bulk amorphous alloys containing nanocrystalline and nanoquasicrystalline particles

Inoue

Fan

Saida

et al. 2000

Science and Technology of Advanced Materials

115

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It was recently found that the addition of special elements leading to the deviation from the three empirical rules for the achievement of high glass-forming ability causes new mixed structures consisting of the amorphous phase containing nanoscale compound or quasicrystal particles in Zr-Al-Ni-Cu-M (M Ag, Pd, Au, Pt or Nb) bulk alloys prepared by the copper mold casting and squeeze casting methods. In addition, the mechanical strength and ductility of the nonequilibrium phase bulk alloys are significantly improved by the formation of the nanostructures as compared with the corresponding amorphous single phase alloys. The composition ranges, formation factors, preparation processes, unique microstructures and improved mechanical properties of the nanocrystalline and nanoquasicrystalline Zr-based bulk alloys are reviewed on the basis of our recent results reported over the last two years. The success of synthesizing the novel nonequilibrium, highstrength bulk alloys with good mechanical properties is significant for the future progress of basic science and engineering. ᭧

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Section: S C I E N C E a N D T E C H N O L O G Y O F Advanced Materialsmentioning

confidence: 98%

High-strength Zr-based bulk amorphous alloys containing nanocrystalline and nanoquasicrystalline particles

Inoue

Fan

Saida

et al. 2000

Science and Technology of Advanced Materials

115

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“…18) and Pd 40 Cu 30-Ni 10 P 20 (Ref. 19) rods were prepared by copper-mold casting. The amorphous states of the samples were confirmed by x-ray diffraction (Bruker D8).…”

Section: Methodsmentioning

confidence: 99%

Characteristic free volumes of bulk metallic glasses: Measurement and their correlation with glass-forming ability

Zeng

2011

Journal of Applied Physics

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Construction of a disorder variable from Steinhardt order parameters in binary mixtures at high densities in three dimensions J. Chem. Phys. 135, 174109 (2011) Fragility of iron-based glasses Appl. Phys. Lett. 99, 161902 (2011) Communication: Are metallic glasses different from other glasses? A closer look at their high frequency dynamics J. Chem. Phys. 135, 101101 (2011) Temperature dependence of the thermoplastic formability in bulk metallic glasses J. Appl. Phys. 110, 043518 (2011) The electronic structure origin for ultrahigh glass-forming ability of the FeCoCrMoCBY alloy system J. Appl. Phys. 110, 033720 (2011) Additional information on J. Appl. Phys. A convenient method is proposed for the measurement of the characteristic free volumes, viz., the amount of excess free volume annihilation in structural relaxation V f-sr and the amount of new free volume production in glass transition V f-gt of bulk metallic glasses (BMGs) by thermal dilation (DIL) test. Through the DIL tests, the characteristic free volumes are found to be sensitive to the change of glass forming ability (GFA). The Pd 40 Cu 30 Ni 10 P 20 BMG has a quite small V f-sr . For a series of Fe-Cr-Mo-C-B-(Er) BMGs, Fe 48 Cr 15 Mo 14 C 15 B 6 Er 2 with the largest GFA is identified to have the largest V f-gt and smallest V f-sr . The correlation between V f-sr and the squares of critical diameters of these iron-based BMGs can be fitted as a negative exponential function with high accuracy.

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“…Differential scanning calorimetry with a heating rate of 40 K͞min resulted in a T g at 578 K and a T liq at 865 K in accordance with values given in Ref. [9]. Slices with a thickness of 1.5 mm were cut from the amorphous bulk sample and sealed in a SiC container.…”

mentioning

confidence: 99%

“…This alloy is the best metallic glass former known so far. A critical cooling rate of only 0.1 K͞s is sufficient to avoid crystallization and to obtain bulk metallic glass castings of up to 72 mm in diameter [9]. Pd 40 Ni 10 Cu 30 P 20 combines a deep eutectic composition with a liquidus temperature T liq at only 865 K (V 4: 1050 K) with a high glass transition temperature T g Ӎ 578 K (V 4: Ӎ 626 K).…”

mentioning

confidence: 99%

Time-Temperature Superposition of Structural Relaxation in a Viscous Metallic Liquid

1999

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Bulk metallic glass-forming Pd 40 Ni 10 Cu 30 P 20 has been investigated in its equilibrium liquid by quasielastic neutron scattering. The quasielastic signal exhibits a structural relaxation as known from nonmetallic viscous liquids. Even well above the melting point, the structural relaxation is nonexponential and obeys a universal time-temperature superposition. From the mean relaxation times average diffusivities have been determined, resulting in values on a 10 210 m 2 s 21 scale, 3 orders of magnitude slower than in simple metallic liquids. PACS numbers: 61.25.Mv, 61.20.Lc, 64.70.Pf During the past few years, new multicomponent Zrbased alloys have been found which show a high stability against crystallization in their undercooled liquid state when cooled below their melting point as well as when heated above the calorimetric glass transition temperature [1,2]. Cooling rates as low as 1 K͞s allow for the casting of bulk metallic glass of up to 50 mm in the smallest dimension. The stability with respect to crystallization comes along with a viscosity of several Pa s at their liquidus temperatures [3,4], which is some 3 orders of magnitude larger than in simple metallic liquids. Hence, one expects atomic motion in the liquid state to differ from the microscopic dynamics in simple metals [5].Recently, we investigated the fast dynamics in liquid Zr 46.8 Ti 8.2 Cu 7.5 Ni 10 Be 27.5 ͑V 4͒ by inelastic neutron scattering [6]. Our results compare well to the behavior of certain molecular and ionic glass-forming liquids [7], and to predictions by the mode-coupling theory (MCT) of the liquid-to-glass transition [8]. Within mode-coupling theory, a fast relaxation process on a meV scale-the fast b relaxation, which can be visualized as a rattling of the atoms in the transient cages formed by their neighborsprepares structural a relaxation responsible for viscous flow. It turned out, that, indeed, there is a fast b relaxation in liquid Zr 46.8 Ti 8.2 Cu 7.5 Ni 10 Be 27.5 and that it is in full accord with mode-coupling theory. The dynamics in an equilibrium metallic liquid towards longer times as well as its behavior relative to the structural a relaxation known from nonmetallic glass-forming systems, remains an open question.In this Letter we report on the study of structural relaxation in liquid Pd 40 Ni 10 Cu 30 P 20 over a broad temperature range. This alloy is the best metallic glass former known so far. A critical cooling rate of only 0.1 K͞s is sufficient to avoid crystallization and to obtain bulk metallic glass castings of up to 72 mm in diameter [9]. Pd 40 Ni 10 Cu 30 P 20 combines a deep eutectic composition with a liquidus temperature T liq at only 865 K (V 4: 1050 K) with a high glass transition temperature T g Ӎ 578 K (V 4: Ӎ 626 K). Therefore, in contrast to simple metallic liquids and most alloys, relaxational dynamics in liquid Pd 40 Ni 10 Cu 30 P 20 is sufficiently slow to study structural relaxation in an equilibrium metallic liquid with quasielastic neutron scattering.Common features of structural...

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Preparation and Thermal Stability of Bulk Amorphous Pd<SUB>40</SUB>Cu<SUB>30</SUB>Ni<SUB>10</SUB>P<SUB>20</SUB> Alloy Cylinder of 72 mm in Diameter

Cited by 336 publications

References 24 publications

High-strength Zr-based bulk amorphous alloys containing nanocrystalline and nanoquasicrystalline particles

High-strength Zr-based bulk amorphous alloys containing nanocrystalline and nanoquasicrystalline particles

Characteristic free volumes of bulk metallic glasses: Measurement and their correlation with glass-forming ability

Time-Temperature Superposition of Structural Relaxation in a Viscous Metallic Liquid

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