Surfaces, interfaces and phase transitions in Al–In monotectic alloys

Kaban, I.; Curiotto, S.; Chatain, Dominique; Hoyer, W.

doi:10.1016/j.actamat.2010.02.015

Cited by 39 publications

(9 citation statements)

References 42 publications

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“…The average contact angle is approximately 18˝, by measurement in the images. The smaller the contact angle, the smaller the free energy of heterogeneous nucleation [26]. So, it is believed to promote the nucleation of the Bi-rich phase due to the smaller contact angle.…”

Section: Contact Angle Of Cebimentioning

confidence: 99%

Effect of Rare-Earth Ce on Macrosegregation in Al-Bi Immiscible Alloys

Man

Zhang

et al. 2016

Metals

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Liquid phase segregation of immiscible alloys has been investigated for decades. In this work, rare-earth Ce was studied as an additive for Al-Bi immiscible alloys. The addition of Ce restrained liquid phase segregation to obtain a uniformly dispersive microstructure. The experimental results indicated that in situ-precipitated intermetallic CeBi 2 compound acted as an inoculant for the heterogeneous nucleation of the Bi-rich droplets. The Bi-rich droplets nucleated on the CeBi 2 compound surface-a homogenous dispersed microstructure obtained via a heterogeneous nucleation route. We concluded that gravity segregation can be suppressed by the addition of rare-earth Ce.

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Section: Contact Angle Of Cebimentioning

confidence: 99%

Effect of Rare-Earth Ce on Macrosegregation in Al-Bi Immiscible Alloys

Man

Zhang

et al. 2016

Metals

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“…We selected a hypermonotectic Al-10 at.% In alloy composition for our in-situ characterization of metallic alloy melting and solidification, with the intent of creating a fraction of indium-rich (In-rich) L 2 liquid droplets distinguishable from the majority aluminum-rich (Al-rich) L 1 liquid phase at elevated temperatures. Given the density difference between these two immiscible liquid phases41, sufficient contrast is available for the study of L 1 /L 2 fluid flow using radiography. Monitoring of the solid-liquid interface is also possible.…”

Section: Resultsmentioning

confidence: 99%

Proton Radiography Peers into Metal Solidification

Clarke

Imhoff

Gibbs

et al. 2013

Sci Rep

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Historically, metals are cut up and polished to see the structure and to infer how processing influences the evolution. We can now peer into a metal during processing without destroying it using proton radiography. Understanding the link between processing and structure is important because structure profoundly affects the properties of engineering materials. Synchrotron x-ray radiography has enabled real-time glimpses into metal solidification. However, x-ray energies favor the examination of small volumes and low density metals. Here we use high energy proton radiography for the first time to image a large metal volume (>10,000 mm3) during melting and solidification. We also show complementary x-ray results from a small volume (<1 mm3), bridging four orders of magnitude. Real-time imaging will enable efficient process development and the control of structure evolution to make materials with intended properties; it will also permit the development of experimentally informed, predictive structure and process models.

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“…Nevertheless, surface segregation of Bi most probably takes place first. This phenomenon that the surface is covered by a component with lower surface tension has been observed in many immiscible systems including Al-Bi, 12,16,22 Al-Pb, 9 Al-In, 23 Cu-Fe, 5 and Fe-Sn 11 systems. It was demonstrated by simulation that surface segregation before decomposition of the bulk liquid phase is favored thermodynamically.…”

Section: Solidification Pathmentioning

confidence: 89%

One-Step Fabrication of Al/Sn-Bi Core–Shell Spheres via Phase Separation

Dai

Zhang

2011

Journal of Elec Materi

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Al/Sn-Bi core-shell spheres, which have potential for use in advanced electronic packaging, were fabricated in one step via phase separation by spraying liquid (Al 0.345 Bi 0.655 ) 67.8 Sn 32.2 alloy into silicone oil. The core-shell spheres changed morphology from three-layer to concentric or eccentric dual-layer type with decreasing melt superheat and increasing oil temperature. The spheres are Al-rich in the core, covered with a Sn-Bi-rich periphery, showing a two-stage melting behavior suitable for electronic packaging. The (Al 0.345 Bi 0.655 ) 67.8 Sn 32.2 alloy was identified through thermal analysis to undergo liquid-phase separation, monotectic reaction, and eutectic reaction one after another during cooling. Finally, the solidification path of (Al 0.345 Bi 0.655 ) 67.8 Sn 32.2 alloy was analyzed and was schematically illustrated.

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Surfaces, interfaces and phase transitions in Al–In monotectic alloys

Cited by 39 publications

References 42 publications

Effect of Rare-Earth Ce on Macrosegregation in Al-Bi Immiscible Alloys

Effect of Rare-Earth Ce on Macrosegregation in Al-Bi Immiscible Alloys

Proton Radiography Peers into Metal Solidification

One-Step Fabrication of Al/Sn-Bi Core–Shell Spheres via Phase Separation

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