Rapid Solidification Via Melt Spinning: Equipment and Techniques

Jech, R. W.; Moore, Thomas J.; Glasgow, T. K.; Orth, N. W.

doi:10.1007/bf03338425

Cited by 12 publications

(4 citation statements)

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“…However, the initial matrix grain size must be small, which can readily be achieved through rapid solidification techniques. Rapid solidification broadly describes methods with cooling rates on the order of 10 2 -10 12 K s −1 that form unique microstructures with non-equilibrium phases and structures [9,31]. Rapid solidification is often used to produce fine matrix grains and particles, but these have inherently high interfacial area, and consequently a large interfacial energy contribution to the total free energy and will readily grow unless they form in a stable configuration or are resistant to coarsening.…”

Section: Specifics Of Strengthening Mechanismsmentioning

confidence: 99%

“…Master alloys in these ratios were first produced by induction melting and casting, then re-melted and solidified into ribbons and flakes by CBMS under an Ar atmosphere with a chilled Cu wheel [9,71,72]. Although commonly used for producing bulk metallic glasses, CBMS is useful for testing small volumes and can yield high cooling rates of 10 5 -10 6 K s −1 under optimum conditions [31]. Some of the ribbons were consolidated for by vacuum hot pressing at 124.2 MPa and 923 K for 1 hr [72].…”

Section: Initial Chill Block Melt Spinning Alloyingmentioning

confidence: 99%

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Copper-based alloys for structural high-heat-flux applications: a review of development, properties, and performance of Cu-rich Cu–Cr–Nb alloys

Minneci

Lass

Bunn

et al. 2020

International Materials Reviews

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This review examines the development and current state of Cu-rich Cu-Cr-Nb alloys commonly referred to as GRCop or Glenn Research copper alloys with emphasis on Cu-8Cr-4Nb (at%), or GRCop-84, and Cu-4Cr-2Nb, or GRCop-42. Recent additive manufacturing efforts have increased interest in GRCop alloys, and full-scale hardware has been fabricated using AM techniques and practical hot-fire tests have been conducted, but structure-property relationships are still under development. The development, processing, and current microstructure-property relationships of GRCop alloys are reviewed along with comparisons to similar high-heat-flux Cu alloys including NARloy-Z, GlidCop Al-15, AMZIRC, Cu-1Cr-0.1Zr, and Cu-0.9Cr. The review concludes with an assessment of future prospects for GRCop alloys and overview of advantages provided by additive manufacturing.

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Section: Specifics Of Strengthening Mechanismsmentioning

confidence: 99%

Section: Initial Chill Block Melt Spinning Alloyingmentioning

confidence: 99%

Copper-based alloys for structural high-heat-flux applications: a review of development, properties, and performance of Cu-rich Cu–Cr–Nb alloys

Minneci

Lass

Bunn

et al. 2020

International Materials Reviews

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“…It is a direct and simple process with minimum intervention of the operator, where a proper control of the melt pressure, nozzle inclination, and nozzle diameter results in high throughput and high ribbon quality . Moreover, compared to conventional heating and processing methods, radio frequency induction heating is the usual method to heat the homogenized ingot within the ceramic crucible, providing faster and local heating rates with better energy efficiency. , …”

Section: Introductionmentioning

confidence: 99%

Enhanced Oxygen Evolution Reaction of Zr-Cu-Ni-Al Metallic Glass with an Oxide Layer in Alkaline Media

et al. 2022

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This study elaborates on the tunability of Zr and O amounts in the ZrO2 layer of a melt-spun Zr65Cu17.5Ni10Al7.5 ribbon under cyclic polarization. The formation of an amorphous Zr-rich oxide layer facilitates the oxygen evolution reaction (OER) as confirmed by the decrease in the Tafel slope from 109 to 80 mV dec–1 as well as conservation of its stability over 250 cycles and at long-term open circuit potential measurement, outperforming many of the precious and transition metal-based oxides and their composites. The evolution of additional binding energy at ∼183.5 eV (Zr3d5 Zr–OH peak) indicates hydroxide ion insertion into the Zr-based metallic glass. The magnitude of impedance (cf. 625 Ω cm2 for as-spun vs 140 Ω cm2 for after-OER at 0.6 V and 100 Hz) and characteristic frequency (c.f. 80° at 0.6 V for as-spun and 30° at 0.9 V for after-OER) vs Ag/AgCl are relatively small for the post-OER electrode compared to the as-spun counterpart, corroborating enhanced kinetics of the post-OER electrode. Modifications in the oxide layer upon the OER yield an enormous increase in ion accumulation and electron transfer with a maximum true capacitance reaching ∼0.0271 F cm–2. Thus, a homogeneous combination of inexpensive Earth-abundant metals and an amorphous structure forms a highly active and stable oxide layer to be used for future renewable energy production materials.

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“…The reason is that the solidification of skutterudite alloys undergoes two peritectic reactions. Instead, the melt-spinning [15][16][17] followed by hot-pressing approaches are usually used to synthesize bulk skutterudite alloys; high ZTs are obtained in these bulk samples [18][19][20][21][22][23][24][25]. For instance, previous studies [26][27][28] reveal that a high-density coherent interface strain field can be generated by the spinodal decomposition in the p-type skutterudite, La 0.8 Ti 0.1 Ga 0.1 Fe x Co 4-x Sb 12 , fabricated by the melt-spinning combined with the hot-pressing approaches.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution and Mechanical Properties of Melt Spun Skutterudite-based Thermoelectric Materials

Geng

Zhang

et al. 2020

Materials

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The rapid solidification of melt spinning has been widely used in the fabrication of high-performance skutterudite thermoelectric materials. However, the microstructure formation mechanism of the spun ribbon and its effects on the mechanical properties are still unclear. Here, we report the microstructure evolution and mechanical properties of La–Fe–Co–Sb skutterudite alloys fabricated by both long-term annealing and melt-spinning, followed by sintering approaches. It was found that the skutterudite phase nucleated directly from the under-cooled melt and grew into submicron dendrites during the melt-spinning process. Upon heating, the spun ribbons started to form nanoscale La-rich and La-poor skutterudite phases through spinodal decomposition at temperatures as low as 473 K. The coexistence of the micron-scale grain size, the submicron-scale dendrite segregation and the nanoscale spinodal decomposition leads to high thermoelectric performance and mechanical strength. The maximum three-point bending strength of the melt spinning sample was about 195 MPa, which was 70% higher than that of the annealed sample.

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Rapid Solidification Via Melt Spinning: Equipment and Techniques

Abstract: SUMMARY

Cited by 12 publications

References 1 publication

Copper-based alloys for structural high-heat-flux applications: a review of development, properties, and performance of Cu-rich Cu–Cr–Nb alloys

Copper-based alloys for structural high-heat-flux applications: a review of development, properties, and performance of Cu-rich Cu–Cr–Nb alloys

Enhanced Oxygen Evolution Reaction of Zr-Cu-Ni-Al Metallic Glass with an Oxide Layer in Alkaline Media

Microstructure Evolution and Mechanical Properties of Melt Spun Skutterudite-based Thermoelectric Materials

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