Effects of alloying components and conditions of solidification on the formation of feathery crystals in aluminum alloys

Nakatani, Yoshizo; Shimizu, Kyoji; Fukuda, Kenji; Hashimoto, Takashi

doi:10.2464/jilm.18.217

Cited by 2 publications

(1 citation statement)

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“…It has been reported that feather crystals sometimes form in a unidirectionally solidified ingot when the pouring temperature is relatively high. 23,24) In the present work, it was assumed that the region of feather crystals corresponds to the region of columnar grains, and the transition from feather crystals to equiaxed grains was regarded as the CET. In the simulated macrostructures, the CET occurred in the upper region of the ingots as observed in the real structures obtained by the experiment.…”

Section: Calculation Proceduresmentioning

confidence: 99%

Prediction of Casting Structure in Aluminum-base Multi-component Alloys Using Heterogeneous Nucleation Parameter

Natsume

Ohsasa

2006

ISIJ Int.

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Heterogeneous nucleation rates in solidifying aluminum-base multi-component alloys (AC2A, AC2B and AC8C commercial alloys) were determined as the form of the nucleation parameter. Unidirectional solidification experiments were carried out using the multi-component alloys and the nucleation parameters were determined by simulating the macrostructure similar to the experimentally observed one with a PF-CA model, which is a model developed by coupling a cellular automaton (CA) method with a phase-field (PF) method. A conventional casting experiment for the multi-component alloys was carried out, and prediction of the macrostructure of the castings with the PF-CA model has been carried out using the determined nucleation parameters from the unidirectional solidification. In the case of the AC2A commercial alloy, the simulated macrostructure was in good agreement with the experimentally observed one. In the case of the AC2B commercial alloy, although the simulated macrostructure near the mold wall was different from the experimentally observed one, the size of inner equiaxed crystals was similar to that observed in the experiment. In the case of the AC8C commercial alloy, the simulated macrostructure was not similar to the experimentally observed one. The disagreement between the results of the experiment and simulation might be due to a multi-phase solidification manner in the AC8C alloy.

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Section: Calculation Proceduresmentioning

confidence: 99%