Cellular growth of lamellar eutectics in undercooled Ag–Cu alloy

Zhao, Shiqing; Li, J.F.; Liu, L.; Zhou, Yaohe

doi:10.1016/j.matchar.2008.12.006

Cited by 38 publications

(30 citation statements)

References 18 publications

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“…Consequently Ag-Cu is regularly selected as a suitable system for undercooling studies. Various processing methods have been employed to investigate solidification of this alloy from its melt, including splat-quenching [1], glass slag melting [2], laser-quenching [3,4], electron beam melting [5], mushy-state quenching [6], melt spinning [7,8], levitation techniques [8], melt fluxing [9][10][11][12][13] and droptube processing [14].…”

mentioning

confidence: 99%

“…Other techniques have produced a range of equilibrium and non-equilibrium microstructures including eutectic [e.g. 5,8,[9][10][11][12][13][14], dendritic [e.g. 5,6,9,12], banded [e.g.…”

mentioning

confidence: 99%

“…4,5,7] and anomalous structures [e.g. 2,9,[11][12][13][14]. At low undercoolings a mixture of eutectic and anomalous microstructures have been reported to develop from a radial solidification front, forming "zones" of microstructure radiating from a single nucleation point [11,12,13].…”

mentioning

confidence: 99%

“…However, it 2 has also been demonstrated that a negative temperature gradient ahead of the eutectic front can have a similar destabilising effect, even in the absence of a third element [15]. In Ag-Cu Zhou et al [11] have suggested that destabilisation of the interface may also arise from the large thermal diffusivity of the alloy melt and the difference in composition of the two phases.…”

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confidence: 99%

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The origin of anomalous eutectic structures in undercooled Ag–Cu alloy

Clopet

Mullis

2013

Acta Materialia

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A melt encasement (fluxing) method has been used to undercool Ag-Cu alloy at its eutectic composition. The recalescence of the undercooled alloy has been filmed at high frame rate. For undercoolings < 60 K a microstructure consisting of mixed anomalous and lamellar eutectic is observed. Analysis of eutectic spacing in the lamellar eutectic reveals little dependence upon the undercooling of the bulk melt and is consistent with growth at an undercooling of 1.5 K.Depending upon undercooling, the progress of the recalescence front may be either continuous or spasmodic, wherein periods of rapid growth are separated by significant interludes in which growth totally arrests. Analysis of spot brightness profiles reveals that during continuous growth the recalescence is characteristic of the advancement of a planar, space-filling, front while during spasmodic growth a double recalescence occurs, the first of which is characteristic of the propagation of a dendritic, or non-space-filling, front. We conclude that during spasmodic growth we observe the propagation of two-phase, or eutectic, dendrites which subsequently remelt to form the anomalous eutectic, while the lamellar eutectic grows during post-recalescence cooling.

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confidence: 99%

“…Other techniques have produced a range of equilibrium and non-equilibrium microstructures including eutectic [e.g. 5,8,[9][10][11][12][13][14], dendritic [e.g. 5,6,9,12], banded [e.g.…”

mentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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The origin of anomalous eutectic structures in undercooled Ag–Cu alloy

Clopet

Mullis

2013

Acta Materialia

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“…In one study of Ag-Cu eutectic alloy it was suggested [10] that the formation of a cellular structure was possibly due to the large thermal diffusivity of the alloy melt and the large difference in the composition of the two phases, rather than due to the presence of an impurity element. This was further investigated in a study [6] looking at the effect of the inclusion of small amounts of Sb in Ag-Cu alloys.…”

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confidence: 99%

Determination of the Origin of Anomalous Eutectic Structures from <i>In Situ</i> Observation of Recalescence Behaviour

Clopet

Mullis

2014

MSF

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Abstract. A melt encasement (fluxing) method has been used to undercool Ag-Cu alloy at its eutectic composition. The recalescence of the undercooled alloy has been filmed at high frame rate. At low undercooling lamellar eutectic is observed to grow, giving way to a mixed anomalouslamellar structure at higher undercooling. In situ observation of the spot brightness reveals, as expected, that the lamellar eutectic grows via a planar front mechanism, while the anomalous eutectic grows via a more complex process characterised by a double recalescence. The first recalescence is non-space-filling (dendritic) in character and is followed shortly afterwards by a second recalescence which appears to be of the planar front type. Moreover, the first recalescence event appears to be to a temperature in excess of the equilibrium eutectic temperature. This is strongly suggestive that the anomalous eutectic morphology arises due to the growth and subsequent partial remelting of a dendritic morphology, probably a two-phase (eutectic) dendrite, followed by planar front growth of a lamellar eutectic into the residual liquid.

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Quasi‐Periodic Recalescence Behaviour in Undercooled Eutectic Alloys

Clopet¹,

Mullis²

2013

TMS2013 Supplemental Proceedings

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Cellular growth of lamellar eutectics in undercooled Ag–Cu alloy

Cited by 38 publications

References 18 publications

The origin of anomalous eutectic structures in undercooled Ag–Cu alloy

The origin of anomalous eutectic structures in undercooled Ag–Cu alloy

Determination of the Origin of Anomalous Eutectic Structures from <i>In Situ</i> Observation of Recalescence Behaviour

Quasi‐Periodic Recalescence Behaviour in Undercooled Eutectic Alloys

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