Facetting behaviour of Al2Cu during solidification

Hamar, Roman; Lemaignan, C.

doi:10.1016/0022-0248(81)90143-3

Cited by 40 publications

(16 citation statements)

References 4 publications

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“…15,23,24 Apaydin et al found that the faceted surface grew more stably as the content of Cu increased and the solidification rate decreased. 24 Moreover, the stability of solid-liquid interface and faceting growth of Al 2 Cu crystal were enhanced due to the reduction of Al-rich liquid by the action of the fluid motion.…”

Section: Faceted Growth In the Magnetic Fieldmentioning

confidence: 98%

Faceted growth of primary Al2Cu crystals during directional solidification in high magnetic field

Ren

Shen

et al. 2013

Journal of Applied Physics

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The high magnetic field is widely used to modify the crystal morphology. In this work, the effect of the magnetic field on growing behavior of faceted crystals in the Al-40 wt. %Cu alloy was investigated using directional solidification technique. It was found that the faceted growth of primary Al2Cu phase was degraded and the primary spacing was reduced upon applying the magnetic field. Additionally, the length of the mushy zone first decreased and then increased with increase of the magnetic field intensity. The quantitative analysis reveals that the shear stress induced by the fluid motion is insufficient to break the atom bonds at the solid-liquid interface. However, both of the thermoelectric magnetic convection (TEMC) and the thermoelectric magnetic force (TEMF) cause dendrites to fracture and reduce the primary spacing. The two effects also weaken the faceting growth. Moreover, the instability of the solid-liquid interface is generated by the TEMF, which further leads to degrade the faceted growth. The length of mushy zone was changed by the TEMC and reached the minimum in the magnetic field of 0.5 T, which is in good agreement with the predicted value (0.83 T).

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Section: Faceted Growth In the Magnetic Fieldmentioning

confidence: 98%

Faceted growth of primary Al2Cu crystals during directional solidification in high magnetic field

Ren

Shen

et al. 2013

Journal of Applied Physics

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“…Using the weight percent of different phases from earlier calculations, the Cu content in eutectic a-Al and CuAl 2 from the phase diagram, Eq. [11] can be used to calculate the Cu in primary a-Al. The average Cu in the primary phase, or the Cu solubility in the primary phase, is now given as:…”

Section: Average Cu Content In Primary Phasementioning

confidence: 99%

“…C 0 ¼ Cu aP w aP 1 Cu aE w aE 1 Cu CuAl 2ŵ CuAl 2 [11] where C 0 is the original alloy composition obtained from ICP technique, and Cu with different subscripts denotes the percentage of Cu in each phase. As the eutectic reaction approaches, it is likely that there would be some undercooling [23] associated with it.…”

Section: Average Cu Content In Primary Phasementioning

confidence: 99%

“…Some of the work done in this area has been limited to correlating eutectic morphology with the equilibrium amounts of individual phases constituting the eutectic. [5][6][7][8] For the Al-Cu system, crystallographic growth characteristics of the eutectic phases, [9,10] faceting behavior of CuAl 2 , [11] and morphologic characterization [12] have been reported.…”

Section: Introductionmentioning

confidence: 99%

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Quantification of microsegregation during rapid solidification of Al-Cu powders

Prasad

Nenein

Conlon

2006

Metall Mater Trans A

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A new technique is introduced to quantify microsegregation during rapid solidification. The quantification involves calculation of the average solute solubility in the primary phase during solidification of an Al-Cu binary alloy. The calculation is based on using volume percent eutectic and weight percent of second phase (in the eutectic), which were obtained experimentally. Neutron diffraction experiments and stereology calculation on scanning electron microscope images were done on impulse atomized Al-Cu alloys of three compositions (nominal), 5 wt pct Cu, 10 wt pct Cu, and 17 wt pct Cu, atomized under N 2 and He gas. Neutron diffraction experiments yielded weight percent CuAl 2 data and stereology yielded volume percent eutectic data. These two data were first used to determine the weight percent eutectic. Using the weight percent eutectic and weight percent CuAl 2 in mass and volume balance equations, the average solute solubility in the primary phase could be calculated. The experimental results of the amount of eutectic, tomography results from previous work, and results from the calculations suggest that the atomized droplets are in metastable state during the nucleation undercooling of the primary phase, and the effect of metastability propagates through to the eutectic formation stage. The metastable effect is more pronounced in alloys with higher solute composition.

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“…In-situ observation of melting and solidification processes of metallic films has been made by the use of a transmission electron microscope (TEM) in order to study grain boundary melting [1][2][3][4], microscopic morphology of a solid-liquid interface [5][6][7][8][9], melting transition [10,11], nucleation behavior of melting or solidification [6,[12][13][14][15][16] and behavior of dislocations in melting [17]. However, it can be pointed out that information on behavior of melt growth is lacking, while the melt growth has been observed by X-ray topography on crystals of Sn [18] and Al [19][20][21][22].…”

Section: Physics Abstractsmentioning

confidence: 99%

Observation of Melt Growth Process of Bi and Sn Thin Films

Sugawara

Watanabé

1993

Microsc. Microanal. Microstruct.

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Abstract. 2014 We observed melt-growth process of Bi and Sn thin films by in-situ transmission electron microscopy. After preparing the films with some specified orientations from bulk single crystals of Bi (99.9 and 99.9999 %) and Sn (99.999 %), we partially melted and regrew them by cooling at a nearly constant rate in an electron microscope. In the Bi films, a growing solid-liquid interface was observed to be concave toward melt more frequently than faceted. The movement of the curved interface was sensitive to small fluctuations of the falling temperature, while the faceted interface was insensitive. During the melt growth various crystal defects were introduced, and their density depends on the orientation, purity of films and the cooling condition. In the Sn films, a growing interface was always curved. The defects formed were confined to lineage defects, of which formation was not influenced by the cooling rate but by the film orientation.

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Facetting behaviour of Al2Cu during solidification

Cited by 40 publications

References 4 publications

Faceted growth of primary Al2Cu crystals during directional solidification in high magnetic field

Faceted growth of primary Al2Cu crystals during directional solidification in high magnetic field

Quantification of microsegregation during rapid solidification of Al-Cu powders

Observation of Melt Growth Process of Bi and Sn Thin Films

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