The effect of gravity and temperature gradients on precipitation in immiscible alloys

Bergman, Alexander; Fredriksson, Hasse; Shahani, H.

doi:10.1007/bf01115694

Cited by 20 publications

(10 citation statements)

References 4 publications

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“…As the liquid-phase separation process determines the final solidification structure, many studies have been carried out on it [1][2][3][4][5][6][7][8][9]. It turned out that the minor volume phase will generate in the form of droplets, and the structure evolution mainly involves nucleation and coagulation of the minor droplets due to Marangoni and Stokes motions.…”

Section: Introductionmentioning

confidence: 99%

Macrosegregation driven by movement of minor phase in (Al0.345Bi0.655)90Sn10 immiscible alloy

Zhang

2014

Appl. Phys. A

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Formation of macrosegregation structure in (Al 0.345 Bi 0.655 ) 90 Sn 10 (mass percent, the same below) immiscible alloy was investigated by spraying its melt into silicone oil. Two kinds of typical macrosegregation structures were obtained in the dispersed alloy spheres: core/ shell structure and crescent structure. Based on the estimated temperature field inside the alloy spheres, the velocities of thermal Marangoni, solutal Marangoni, and Stokes motions of the Bi-rich minor droplets were calculated. Analysis shows that surface segregation, Soret effect, thermal Marangoni motion, solutal Marangoni motion, and Stokes motion play a key role in the formation of Al/Bi-Sn core/shell structure. If the liquid alloy spheres solidify on the condition that the radius of the Bi-rich minor droplets is smaller than a critical value, it will form Al/Bi-Sn core/ shell structure, while the crescent structure will be formed when the liquid alloy spheres frozen on the condition that the radius of the Bi-rich minor droplets exceeds the critical value.

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Section: Introductionmentioning

confidence: 99%

Macrosegregation driven by movement of minor phase in (Al0.345Bi0.655)90Sn10 immiscible alloy

Zhang

2014

Appl. Phys. A

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“…This results in low cast quality and demixing, which causes inhomogeneous dispersion of minor phase particles in the monotectic matrix. [20][21][22][23] The casting of wide freezing range alloys is problematic. These drawbacks have delayed the wide use of monotectics as industrial materials to date; even a classification scheme of monotectic solidification and the resulting morphology, as it was achieved previously for eutectics, [9,10] have not yet been completed.…”

Section: Introductionmentioning

confidence: 99%

Effects of squeeze casting on the properties of Zn-Bi monotectic alloy

Savas

Altıntaş

Erturan³

1997

Metall Mater Trans A

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In composite production, the shortest route is via an in situ composite in which a melt dissociates simultaneously into two rather different solid phases. The monotectic alloys can be included in this group. The present work was aimed at extending our recent squeeze casting experience on the Zn-Bi monotectic alloy in order to increase its cast quality and mechanical properties. A squeeze casting unit was built, and its die and punch were machined. The molten monotectic alloy was squeezed in this unit under pressures up to 120 MPa in its freezing range until it solidified completely. It was found that an increase in squeeze casting pressure provided increases in density, tensile strength, and Vickers hardness, which resulted in decreases in chip length and electrical resistivity. Before the squeeze casting practice, the freezing characteristics of this monotectic were estimated using basic solidification principles.

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“…In 1993, VignesAdler et al investigated on Maser 6 solutal Marangoni effects occurring when a surfactant transfers from a drop immersed in an aqueous solution without/with an interfacial exchange reaction, and determined the origin of interfacial turbulences at the drop surface [5]. In relation to this, numerous experiments aiming at understanding the microstructure formed in immiscible alloys upon de-mixing followed by solidification were performed on Texus 5 [6]. After several basic studies, the microgravity experiments on capillarity have moved towards increasingly complex phenomena, mostly involving interfacial dynamics as in the two FAST missions in 1998 and 2003.…”

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confidence: 99%