Liquid phase separation in melt-spun Cu70Co30 ribbon

Song, Xiaoping; Mahon, S.; Mullis, Andrew M.; Hickey, B. J.; Howson, M. A.

doi:10.1016/s0167-577x(96)00284-4

Cited by 31 publications

(17 citation statements)

References 5 publications

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“…The Cu-Cr phase diagram with miscibility gap may help to explain the resulted microstructure, but further work is necessary to understand the phenomena and their results during solidification in Cu-Cr alloys. A liquid-phase separation phenomenon also was observed in the alloy systems of Cu-Fe and Cu-Co [15][16]. Sun et al [6] suggested that the liquid-phase separation phenomenon took place at three successive stages: (1) formation of the second-phase rich droplets; (2) growth of droplets; (3) coalescence of small droplets into larger droplets and the solidification of two liquid phases.…”

Section: Discussionmentioning

confidence: 91%

A Cu-Cr alloy with nano and microscale Cr particles produced in a water-cooled copper mold

Hejazi

Fatemeh

Akbari

2010

Int J Miner Metall Mater

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Microstructures have profound effects on the hardness and strength of Cu-Cr alloys. The microstructures of a Cu-Cr alloy cast in a water-cooled copper mold were studied in the present work. The scanning electron microscopy (SEM) results show that there are the copper matrix saturated with chromium, spherical precipitates of chromium separated from liquid phase during cooling before the initiation of solidification, and a eutectic phase in grain boundary areas. To investigate the effect of age-hardening treatment on the microstructures and properties of the material, some samples were subsequently age-hardened in a salt bath and investigated by transmission electron microscopy (TEM). The results show that coherent precipitates with the diameter of 11 nm are detectable in the samples before and after the age-hardening stage. Of course, the volume fraction of coherent precipitates is higher after the aging process.

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Section: Discussionmentioning

confidence: 91%

A Cu-Cr alloy with nano and microscale Cr particles produced in a water-cooled copper mold

Hejazi

Fatemeh

Akbari

2010

Int J Miner Metall Mater

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“…According to the research for Cu-Co and Cu-Fe systems, two liquids from liquid phase separation will solidify respectively depending on their compositions and supercoolings [19][20][21]. Fig.…”

Section: Discussionmentioning

confidence: 99%

Effects of Zr addition on the liquid phase separation and the microstructures of Cu–Cr ribbons with 18–22at.% Cr

Sun

Guo

Song

et al. 2008

Journal of Alloys and Compounds

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“…Therefore, CuCo alloys with such controlled phase separation structures have attracted attention not only as suitable materials in the fields of electrical and magnetic materials, but also as model materials for investigating the kinetics of liquid phase separation. [1][2][3][4][5][6] In addition to the compositions, cooling rate, and degree of undercooling, the convection in molten CuCo alloys also strongly affects the phase separation structures. The effect of melt convection on the phase separation structures in an electromagnetically levitated molten CuCo droplet in the undercooled state has recently been investigated, [7][8][9][10] where the electromagnetic force drives magnetohydrodynamic (MHD) convection in the levitated droplet, in addition to buoyancy convection and Marangoni convection due to thermal inhomogeneity.…”

Section: Introductionmentioning

confidence: 99%

Effect of Static Magnetic Field on Recalescence and Surface Velocity Field in Electromagnetically Levitated Molten CuCo Droplet in Undercooled State

Kitahara

Tanada

Ueno

et al. 2015

Metall Mater Trans B

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TSUBASA KITAHARA, KOKI TANADA, SHOYA UENO, KEN-ICHI SUGIOKA, MASAKI KUBO, TAKAO TSUKADA, MASAHITO UCHIKOSHI, and HIROYUKI FUKUYAMA The recalescence events of phase-separated Co-rich phases in undercooled molten CuCo droplets electromagnetically levitated under various static magnetic fields were observed directly using a high-speed camera, and also the surface velocities on the levitated droplets were measured by tracing the trajectories of the phase-separated Co-rich phases as tracer particles. In addition, numerical simulations of melt convection in a spherical electromagnetically levitated CuCo droplet exposed to a static magnetic field were performed assuming laminar flow. We observed the emergence of many intermittent bright spots due to recalescence on the entire surface of the levitated droplet, and the frequency of the bright spots decreased markedly as the static magnetic field increased, with no bright spots observed at fields larger than 1.5 T. Also, the Reynolds numbers were evaluated from the measured and calculated velocities in the droplet for various static magnetic fields and compared with the critical Reynolds number of approximately 600, at which the laminar-turbulent transition of a magnetohydrodynamic (MHD) flow in an electromagnetically levitated droplet occurs, as proposed by Hyers et al. The above results clearly revealed that the marked change in the phase separation structures in undercooled molten CuCo droplets at approximately 1.5 T is due to a convective transition from turbulent flow to laminar flow in the levitated droplets, as speculated in our previous work.

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Liquid phase separation in melt-spun Cu70Co30 ribbon

Cited by 31 publications

References 5 publications

A Cu-Cr alloy with nano and microscale Cr particles produced in a water-cooled copper mold

A Cu-Cr alloy with nano and microscale Cr particles produced in a water-cooled copper mold

Effects of Zr addition on the liquid phase separation and the microstructures of Cu–Cr ribbons with 18–22at.% Cr

Effect of Static Magnetic Field on Recalescence and Surface Velocity Field in Electromagnetically Levitated Molten CuCo Droplet in Undercooled State

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