Macrosegregation pattern and microstructure feature of ternary Fe–Sn–Si immiscible alloy solidified under free fall condition

Wang, W.L.; Li, Z.Q.; Wei, B.

doi:10.1016/j.actamat.2011.05.022

Cited by 96 publications

(31 citation statements)

References 29 publications

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“…So the concentration gradient appears. The concentration gradient can drive solutal Marangoni flow, which propels the Bi-rich minor droplets outwards [17]. Meanwhile, as the center of the liquid alloy sphere always possesses higher temperature and thus lower interfacial energy than the surface, the direction of thermal Marangoni motion on the basis of the temperature dependence of the interfacial tension is inward [10,14].…”

Section: Movement Of Minor Dropletsmentioning

confidence: 99%

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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: Movement Of Minor Dropletsmentioning

confidence: 99%

“…However, the ternary immiscible alloys always undergo more complicated liquid-phase separation process than binary immiscible alloys [17,18]. Sun et al [19,20] reported that, characterized by the decrease in the volume fraction of Corich minor droplets, the liquid-phase separation of Cu-Co alloys can be depressed by Ni alloying.…”

Section: Introductionmentioning

confidence: 98%

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

Zhang

2014

Appl. Phys. A

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“…These alloy droplets fell freely inside a 3 m drop tube [1] and were solidified in a container-less state. After the experiments, the solidified samples were sectioned, polished, and then etched with a solution of 1 g CuSO 4 +40 mL HNO 3 +75 mL H 2 O for 5 s. Their solidification microstructures were analyzed by an FEI Sirion 200 Scanning Electron Microscope, a Rigaku D/max 2500 X-ray Diffractometer, and an INCA Energy 300 Energy Dispersive Spectrometer.…”

Section: Methodsmentioning

confidence: 99%

“…Intermetallic compounds have developed into an important category of structural materials with potential high temperature applications. Since their microstructural morphology and solute distribution are intrinsically correlated with mechanical properties, extensive work has been done on the directional and rapid solidification processes of intermetallic alloy [1][2][3][4][5][6]. However, most previous investigations were concentrated on the microstructural evolution at small undercooling condition.…”

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confidence: 99%

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Primary dendrite growth of Ni3Sn intermetallic compound during rapid solidification of undercooled Ni-Sn-Ge alloy

2012

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Liquid Ni-31.7%Sn-2.5%Ge alloy was highly undercooled by up to 238 K (0.17T L ) with glass fluxing and drop tube techniques. The dendritic growth velocity of primary Ni 3 Sn compound shows a power-law relation to undercooling and achieves a maximum velocity of 380 mm/s. The addition of Ge reduces its growth velocity as compared with the binary Ni 75 Sn 25 alloy. A structural transition from coarse dendrites into equiaxed grains occurs once undercooling exceeds a critical value of about 125 K, which is accompanied by both grain refinement and solute trapping. The Ni 3 Sn intermetallic compound behaves like a normal solid solution phase showing nonfaceted growth during rapid solidification. Intermetallic compounds have developed into an important category of structural materials with potential high temperature applications. Since their microstructural morphology and solute distribution are intrinsically correlated with mechanical properties, extensive work has been done on the directional and rapid solidification processes of intermetallic alloy [1][2][3][4][5][6]. However, most previous investigations were concentrated on the microstructural evolution at small undercooling condition. If an intermetallic compound nucleates and grows from a highly undercooled alloy melt, its formation mechanism will display novel kinetic characteristics because of the extremely nonequilibrium thermodynamic state. During conventional solidification, the heterogeneous nucleation caused by the crucible or mold walls prevents liquid alloys from achieving large undercoolings. Fortunately, glass fluxing [5] method and drop tube processing [1] provide an effective way to eliminate heterogeneous nuclei and subsequently undercool liquid alloys to a great extent. The Ni 3 Sn intermetallic compound has attracted much attention in research because it shows an anomalous increase in yield stress with rising temperature like the Ni 3 Al alloy [2,[7][8][9]. The Ni 3 Sn intermetallic compound has a cubic BiF 3 -type(DO 3 ) crystalline structure above 1193.5 K and transforms into an ordered hexagonal Mg 3 Cd-type (DO 19 ) structure at lower temperatures. Meanwhile, Ni 3 Snbased alloys usually exhibit satisfactory undercoolability to realize bulk rapid solidification. The objective of this paper is to investigate the dendritic growth mechanism and solute trapping effect of the Ni 3 Sn intermetallic compound during the rapid solidification of the highly undercooled ternary Ni-Sn-Ge alloy. Both glass fluxing and drop tube techniques have been applied to achieve high undercoolings.

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Extraordinary Solidification Mechanism of Liquid Alloys Under Acoustic Levitation State

et al. 2022

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The acoustic levitation of various materials can be realized by highly intensive ultrasound, which provides a free surface and containerless state for materials processing under space simulation conditions. The nonlinear effects such as acoustic radiation pressure, acoustic streaming, and ultrasonic cavitation open up special access to modulate the fluid dynamics and solidification mechanisms of liquid materials. Here, the physical characteristics of liquid flow, undercooling capability, phase separation, and crystal nucleation and growth within acoustically levitated droplets are explored comprehensively to reveal the extraordinary solidification kinetics of liquid alloys. The sectorial shape oscillations of the 2nd to 10th order modes accompanying internal potential flow are observed for water droplets with modulated ultrasound amplitudes, while the enhanced ultrasound intensity promotes ice nucleation and thus reduces water undercooling. The migration of Sn‐rich globules during phase separation of immiscible Al–Cu–Sn alloy is dominated by the droplet deformation and rotation related to acoustic levitation. The high undercooling states of liquid Ag–Cu–Ge and Ni–Sn alloys during acoustic levitation result in the refinement of (Ag) dendrites and the formation of anomalous (Ni+Ni3Sn) eutectics. The ultrasound–liquid interaction also induces surface waves during the containerless solidification of Ag–Cu and Ni–Sn eutectic alloys.

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Macrosegregation pattern and microstructure feature of ternary Fe–Sn–Si immiscible alloy solidified under free fall condition

Cited by 96 publications

References 29 publications

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

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

Primary dendrite growth of Ni3Sn intermetallic compound during rapid solidification of undercooled Ni-Sn-Ge alloy

Extraordinary Solidification Mechanism of Liquid Alloys Under Acoustic Levitation State

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