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

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

Research output: Chapter in Book/Report/Conference proceedingConference 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 languageEnglish (US)
Title of host publicationMaterials Science and Technology Conference and Exhibition 2015, MS and T 2015
PublisherAssociation for Iron and Steel Technology, AISTECH
Pages301-309
Number of pages9
Volume1
ISBN (Print)9781510813939
StatePublished - 2015
EventMaterials Science and Technology Conference and Exhibition 2015, MS and T 2015 - Columbus, United States
Duration: Oct 4 2015Oct 8 2015

Other

OtherMaterials Science and Technology Conference and Exhibition 2015, MS and T 2015
CountryUnited States
CityColumbus
Period10/4/1510/8/15

Keywords

  • Hunt and Lu model
  • Microgravity
  • Primary dendrite arm spacing

ASJC Scopus subject areas

  • Materials Science (miscellaneous)
  • Mechanics of Materials

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