Microstructural response to controlled accelerations during the directional solidification of Al-6 wt. % Si alloys

Journal Article · Wed Dec 01 00:00:00 EST 1993 · Materials Characterization; (United States)

DOI:https://doi.org/10.1016/1044-5803(93)90066-5· OSTI ID:5656123

Pratt, R A ^[1]; Grugel, R N ^[2]

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1. Olin Metals, East Alton, IL (United States)
2. Vanderbilt Univ., Nashville, TN (United States). Center for Microgravity Research and Applications

After establishing steady-state directional growth, aluminum-6 wt.% silicon alloys were subjected to a series of programmed accelerations and decelerations. The response of the primary dendrite arm spacing ([lambda][sub 1]), the eutectic spacing ([lambda][sub E]), and the primary dendrite trunk diameter (d) to the imposed rate changes were evaluated and compared with results from constant growth velocity experiments. It was found that both [lambda][sub E] and d responded to a continually changing growth rate, whereas [lambda][sub 1] did not. The implication of using these microstructural features to characterize solidification histories is discussed.

• OSTI ID: 5656123
• Journal Information: Materials Characterization; (United States), Vol. 31:4; ISSN 1044-5803
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM SILICIDES
MICROSTRUCTURE
CRYSTAL GROWTH
DENDRITES
EUTECTICS
GRAIN ORIENTATION
PHASE STUDIES
SOLIDIFICATION
STEADY-STATE CONDITIONS
ALUMINIUM COMPOUNDS
CRYSTALS
ORIENTATION
PHASE TRANSFORMATIONS
SILICIDES
SILICON COMPOUNDS
360102* - Metals & Alloys- Structure & Phase Studies
360601 - Other Materials- Preparation & Manufacture