Primary dendrite arm spacings in Al-7Si alloy directionally solidified on the international space station

Samuel Angart; Mark Lauer; David Poirier; Surendra Tewari; Ravi Rajamure; Richard Grugel

Primary dendrite arm spacings in Al-7Si alloy directionally solidified on the international space station

Samuel Angart, Mark Lauer, David Poirier, Surendra Tewari, Ravi Rajamure, Richard Grugel

Materials Science and Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

Samples from directionally solidified Al- 7 wt. % Si have been analyzed for primary dendrite arm spacing (A). The alloy was directionally solidified (DS) aboard the International Space Station (ISS) to determine the effect of mitigating convection on λ. In some experiments, λ was measured in microstructures that developed during the transition from one speed to another. To represent DS in the presence of no convection, the Hunt-Lu model was used to represent diffusion-controlled growth. By sectioning cross-sections throughout the entire length of a solidified sample, λ. was measured and calculated using the model. During steady state, there was reasonable agreement between the measured and calculated λ's in the space-grown samples. Where there was evidence of Marangoni convection, however, resulted in primary dendrite arm spacings that were larger than they would have been in the absence of convection.

Original language	English (US)
Title of host publication	Materials Science and Technology Conference and Exhibition 2015, MS and T 2015
Publisher	Association for Iron and Steel Technology, AISTECH
Pages	301-309
Number of pages	9
ISBN (Electronic)	9781510813939
State	Published - 2015
Event	Materials Science and Technology Conference and Exhibition 2015, MS and T 2015 - Columbus, United States Duration: Oct 4 2015 → Oct 8 2015

Publication series

Name	Materials Science and Technology Conference and Exhibition 2015, MS and T 2015
Volume	1

Other

Other	Materials Science and Technology Conference and Exhibition 2015, MS and T 2015
Country/Territory	United States
City	Columbus
Period	10/4/15 → 10/8/15

Keywords

Hunt and Lu model
Microgravity
Primary dendrite arm spacing

ASJC Scopus subject areas

Materials Science (miscellaneous)
Mechanics of Materials

Cite this

Angart, S., Lauer, M., Poirier, D., Tewari, S., Rajamure, R., & Grugel, R. (2015). Primary dendrite arm spacings in Al-7Si alloy directionally solidified on the international space station. In Materials Science and Technology Conference and Exhibition 2015, MS and T 2015 (pp. 301-309). (Materials Science and Technology Conference and Exhibition 2015, MS and T 2015; Vol. 1). Association for Iron and Steel Technology, AISTECH.

Primary dendrite arm spacings in Al-7Si alloy directionally solidified on the international space station. / Angart, Samuel; Lauer, Mark; Poirier, David et al.
Materials Science and Technology Conference and Exhibition 2015, MS and T 2015. Association for Iron and Steel Technology, AISTECH, 2015. p. 301-309 (Materials Science and Technology Conference and Exhibition 2015, MS and T 2015; Vol. 1).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Angart, S, Lauer, M, Poirier, D, Tewari, S, Rajamure, R & Grugel, R 2015, Primary dendrite arm spacings in Al-7Si alloy directionally solidified on the international space station. in Materials Science and Technology Conference and Exhibition 2015, MS and T 2015. Materials Science and Technology Conference and Exhibition 2015, MS and T 2015, vol. 1, Association for Iron and Steel Technology, AISTECH, pp. 301-309, Materials Science and Technology Conference and Exhibition 2015, MS and T 2015, Columbus, United States, 10/4/15.

Angart S, Lauer M, Poirier D, Tewari S, Rajamure R, Grugel R. Primary dendrite arm spacings in Al-7Si alloy directionally solidified on the international space station. In Materials Science and Technology Conference and Exhibition 2015, MS and T 2015. Association for Iron and Steel Technology, AISTECH. 2015. p. 301-309. (Materials Science and Technology Conference and Exhibition 2015, MS and T 2015).

Angart, Samuel ; Lauer, Mark ; Poirier, David et al. / Primary dendrite arm spacings in Al-7Si alloy directionally solidified on the international space station. Materials Science and Technology Conference and Exhibition 2015, MS and T 2015. Association for Iron and Steel Technology, AISTECH, 2015. pp. 301-309 (Materials Science and Technology Conference and Exhibition 2015, MS and T 2015).

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AB - Samples from directionally solidified Al- 7 wt. % Si have been analyzed for primary dendrite arm spacing (A). The alloy was directionally solidified (DS) aboard the International Space Station (ISS) to determine the effect of mitigating convection on λ. In some experiments, λ was measured in microstructures that developed during the transition from one speed to another. To represent DS in the presence of no convection, the Hunt-Lu model was used to represent diffusion-controlled growth. By sectioning cross-sections throughout the entire length of a solidified sample, λ. was measured and calculated using the model. During steady state, there was reasonable agreement between the measured and calculated λ's in the space-grown samples. Where there was evidence of Marangoni convection, however, resulted in primary dendrite arm spacings that were larger than they would have been in the absence of convection.

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Primary dendrite arm spacings in Al-7Si alloy directionally solidified on the international space station

Abstract

Publication series

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Keywords

ASJC Scopus subject areas

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