Solidification of the Undercooled Al-Si Alloy Containing 1.0 PctRE

Dang, Bo; Jian, Zengyun; Xu, Jun; Yan, Junhui

doi:10.1007/s11661-016-3882-z

Cited by 3 publications

(3 citation statements)

References 23 publications

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“…The sample was preheated by a 200 W continuous wave CO 2 laser. Next, the radio-frequency generator was switched on, and the sample levitated [16,21]. The sample was heated and cooled cyclically to remove the oxide and the heterogeneous core.…”

Section: Methodsmentioning

confidence: 99%

“…Recently, researchers have observed the solidification process of the silicon alloys using high speed video (HSV) and an infrared pyrometer [14][15][16]. Aoyama et al [17] reported that the behavioural growth characteristics of silicon and germanium go through the lateral, continuous, and successive nucleation process with increased undercooling, and the undercooling transition for silicon were 100 and 210 K, and for germanium were 85 and 170 K. Jian et al [18,19] recorded the recalescence interface and growth morphology of the undercooled silicon using EML and HSV.…”

Section: Introductionmentioning

confidence: 99%

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Critical undercooling of growth mode transition in undercooled Al-80%Si-1.0%P alloy

Dang

Jian

2022

Materials Science and Technology

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Herein, the critical undercooling of growth mode transitions in highly undercooled Al-80%Si-1.0%P alloys were investigated by high-speed video to observe and record the growth process. Under low undercooling, the dendrites with special edges of primary silicon solidify from the undercooled melt and show lateral growth characteristics. As undercooling increases, the primary silicon grows as blocky and dendritic shapes, indicating mixed growth characteristics. With sufficiently high undercooling, the sample's surface exhibits the equiaxed primary silicon and shows non-lateral growth characteristics. The experimentally determined critical undercooling for the growth mode transition of primary silicon in undercooled Al-80%Si-1.0%P alloys are 125 and 225 K, and are consistent with the theoretically predicted values, 112 and 208 K, respectively.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Critical undercooling of growth mode transition in undercooled Al-80%Si-1.0%P alloy

Dang

Jian

2022

Materials Science and Technology

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“…Experiments to investigate the morphological transition of primary Si were using electromagnetic levitation (EML) method in a facility that can be evacuated and filled with gases (details in Refs. 14 , 26 ). Firstly, the sample was placed on a sintered boron nitride holder positioned in the center of the EML coil.…”

Section: Methodsmentioning

confidence: 99%

The effect of phosphorus on solidification behaviour of undercooled Al–70 wt.%Si alloys

Dang

Jian

2020

Sci Rep

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Effect of refining element phosphorus (P) on the morphology of the primary silicon in the Al–70 wt.%Si alloy was investigated via the electromagnetic levitation (EML) technique. The morphology and microstructure were analyzed by using high-speed video (HSV) and scanning electron microscopy (SEM). It was found that the morphology of primary silicon transformed from dendrites with several branches to blocky shape, and then to equiaxed grains in Al–70 wt.%Si and Al–70 wt.%Si–1.0 wt.%P alloys with increasing of undercooling. The nucleation number and nucleation rate increased exponentially with the increase of undercooling for both alloys. Finally, the growth velocity of primary silicon was discussed in combination with classical theory.

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