Metastable phases produced by laser melt quenching

Elliott, William Allan; Gagliano, F. P.; Krauß, G.

doi:10.1007/bf02643264

Cited by 67 publications

(9 citation statements)

References 5 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].…”

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confidence: 99%

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%

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

Clopet

Mullis

2013

Acta Materialia

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“…However, the thermal profile is not well controlled in these experiments, which are therefore not well suited (at least up to now) to give a full quantitative characterization of the bifurcation. The set of equations (3)- (10) Substituting equations (13)- (14) in the interface boundary conditions (4) and (6) and expanding these resulting equations about z = 0 to first order in e, one obtains :…”

Section: Introductionmentioning

confidence: 99%

“…They are given by [2,3] : where The interface boundary conditions (4) and (6) The values of di are listed in appendix C.…”

Section: Introductionmentioning

confidence: 99%

“…So, since the ratio Y-/Y+ is significant (due to the importance of tl), the 3He-4He azeotrope seems to be a good candidate on which to perform experiments and measure the effect of the chemical capillary term. 4. Non linear stability analysis.…”

Section: Introductionmentioning

confidence: 99%

“…with a front deforma- (1) In rapid solidification experiments, which use a pulsed laser [4] or electron beam [5] to melt a spot in the surface region, the resolidification velocity, which is directly related to that of the beam, can reach values larger than Vmax.…”

Section: Introductionmentioning

confidence: 99%

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