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Modeling Macrosegregation in Directionally Solidified Aluminum Alloys under Gravitational and Microgravitational Conditions

Technical Report ·
DOI:https://doi.org/10.2172/1433070· OSTI ID:1433070
 [1];  [1];  [1];  [2];  [3]
  1. The Univ. of Arizona, Tucson, AZ (United States)
  2. Cleveland State Univ., Cleveland, OH (United States)
  3. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
+ Show Author Affiliations
This report covers the modeling of seven directionally solidified samples, five under normal gravitational conditions and two in microgravity. A model is presented to predict macrosegregation during the melting phases of samples solidified under microgravitational conditions. The results of this model are compared against two samples processed in microgravity and good agreement is found. A second model is presented that captures thermosolutal convection during directional solidification. Results for this model are compared across several experiments and quantitative comparisons are made between the model and the experimentally obtained radial macrosegregation profiles with good agreement being found. Changes in cross section were present in some samples and micrographs of these are qualitatively compared with the results of the simulations. It is found that macrosegregation patterns can be affected by changing the mold material.
Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
NASA; USDOE
DOE Contract Number:
AC04-94AL85000
OSTI ID:
1433070
Report Number(s):
SAND--2014-17638; 662153
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE