The freezing of some continuous binary eutectic mixtures

Cooksey, D. J. S.; Munson, D.; Wilkinson, Michael; Hellawell, A.

doi:10.1080/14786436408225381

Cited by 142 publications

(39 citation statements)

References 6 publications

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“…Moreover, the lamellae are not completely uniform in thickness, and even areas with irregular microstructure are present with lamellar sheets running into different directions. Such microstructures have been previously described by Cooksey et al 18) Reasons for irregular morphology are: (i) non-uniform orientation of a set of lamellae with respect to the plane of section, (ii) occurrence of localized cooling at junctions of cells that enhances the freezing rate. The volume fraction of irregular structures was larger at the beginning of the solidification (bottom of the rods), most likely due to the non-radial heat flow conditions.…”

Section: Microstructure Of Copper Mould Cast Rodsmentioning

confidence: 91%

Cooling Rate Evaluation for Bulk Amorphous Alloys from Eutectic Microstructures in Casting Processes

et al. 2002

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The structural features of metallic glasses depend on the cooling rate of the melt. The cooling rates for casting processes which are typically employed for preparation of bulk metallic glasses are suggested from microstructures of an eutectic Al-33 mass%Cu model alloy. The interlamellar spacing λ of eutectic Al-CuAl 2 rod-shaped specimens of 50 mm in length and 2 to 5 mm in diameter has been determined by optical microscopy and scanning electron microscopy. From the measured interlamellar spacings ranging from λ = 0.18 to 0.5 µm, the solidification front velocities and the cooling rates at different positions in the as-cast samples are derived. The decisive effect of the diameter of cast rods is confirmed. For a centrifugal casting technique, the maximum cooling rate decreases from 730 to 95 K/s when the diameter increases from 2 to 5 mm. Moreover, it is revealed that the local cooling rates decrease significantly from the bottom towards the top of the rods. From the estimated cooling rates at a fixed rod diameter the centrifugal casting technique is assessed as superior to other methods applied, namely copper-mould casting and suction casting. The estimated cooling rates are compared with literature data for glass-forming alloys.

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Section: Microstructure Of Copper Mould Cast Rodsmentioning

confidence: 91%

Cooling Rate Evaluation for Bulk Amorphous Alloys from Eutectic Microstructures in Casting Processes

et al. 2002

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“…1,2) The phase diagram, 3,4) exhibits an extended solid solubility range on both sides and an eutectic point at the composition of Ag 60 Cu 40 with a transition temperature of 1 053 K.…”

Section: Introductionmentioning

confidence: 99%

Surface Tension of Liquid Ag–Cu Binary Alloys

et al. 2014

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Surface tension of liquid Ag-Cu binary alloys has been measured contactlessly using the technique of electromagnetic levitation in combination with the oscillating drop technique. The measurements were performed at temperatures above the melting point of alloys. The surface tension values were obtained from an analysis of the frequency spectra of droplet oscillations recorded with a CMOS-camera at 400 fps.The alloy samples covered the entire composition range. The surface tension data can be described by linear functions of temperature with negative slopes. The new experimental data were compared to the corresponding theoretical values calculated combining the Butler equation with the ideal and subregular solution models, respectively. The agreement with the experimentally obtained data is excellent for the isothermal surface tension and quite reasonable for their temperature coefficients.

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“…These should be investigated in future. 6 Sn 5 relative to copper content In the course of this study, the volume fraction of the eutectic Cu 6 Sn 5 did not depend on the growth velocity but did depend on the copper content. This finding is important for understanding the solidified structure in eutectic systems.…”

Section: The Primary Cu 6 Sn 5 + Eutectic Regionmentioning

confidence: 67%

“…4) Furthermore, Cooksey et al reported that the rod structure changes to lamellar in the region of the eutectic cell's boundary in the case of an impure eutectic system. 5) Mollard and Flemings studied the eutectic structure in Sn-Pb alloys and noted a morphology change from lamellar to rod when the Pb content was increased. 6,7) This change in morphology may be due to a volume change in the eutectic structure; however, they did not mention the mechanism in detail.…”

Section: Introductionmentioning

confidence: 99%

Relation between the Solidification Condition and Volume Fraction of Rod-Like Eutectic Cu<sub>6</sub>Sn<sub>5</sub> Phase in the Eutectic Structure in Sn-Cu Alloys

et al. 2015

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The Sn-Cu alloy is a typical rod-like eutectic system. The eutectic Cu 6 Sn 5 phase is a minor phase exhibiting a rod-like structure. The volume fraction of this eutectic Cu 6 Sn 5 (f ECu6Sn5 ) is characterized as a function of copper content and growth velocity using an image analyzer. The volume fraction variation of the eutectic Cu 6 Sn 5 relative to copper content is classified into three regions depending on the solidified structure. In the primary ¢-Sn + eutectic structure and primary Cu 6 Sn 5 + eutectic structure regions, the f ECu6Sn5 increased with increasing growth velocity, independent of the copper content. These were qualitatively explained by the undercooling for the growth of both phases. On the other hand, in the eutectic structure region, the f ECu6Sn5 increased with copper content, independent of the growth velocity. The mechanism for the volume fraction change of the eutectic Cu 6 Sn 5 under this growth condition was discussed. In order to exhibit the eutectic structure even for the off-eutectic composition, the volume of eutectic Cu 6 Sn 5 was primarily altered by their changed rod diameters.

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The freezing of some continuous binary eutectic mixtures

Cited by 142 publications

References 6 publications

Cooling Rate Evaluation for Bulk Amorphous Alloys from Eutectic Microstructures in Casting Processes

Cooling Rate Evaluation for Bulk Amorphous Alloys from Eutectic Microstructures in Casting Processes

Surface Tension of Liquid Ag–Cu Binary Alloys

Relation between the Solidification Condition and Volume Fraction of Rod-Like Eutectic Cu<sub>6</sub>Sn<sub>5</sub> Phase in the Eutectic Structure in Sn-Cu Alloys

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