|
7183 |
|
Thursday, June 23, 2022, Saal Brüssel 11:40 AM Modeling and simulation |
|
Capillary flow of aluminum braze in microgravity |
|
Dusan Sekulic* / University of Kentucky, United States of America Yangyang Wu / University of Kentucky/Department of Mechanical Engineering, USA Sinisa Mesarovic/ Washington State University/School of Mechanical and Materials Engineering, USA Konstantinos Lazaridis/ Washington State University/School of Mechanical and Materials Engineering, USA Mikhail Krivilyov/ Udmurt Federal Research Center, Ural Branch of the Russian Academy of Sciences, Russia |
|
This report offers an insight into the study of a molten Al-Si-KxFyAlz braze behavior under terrestrial, and microgravity conditions on the International Space Station (ISS). The BRazing of Aluminum alloys IN Space (SUBSA-BRAINS) project seeks to provide insight into the surface tension driven capillary flow of a braze alternately exposed to terrestrial and ISS conditions. This work is funded by NASA’s Physical Sciences Research Program (NASA Grant# NNX17AB52G) and Roscosmos Research ISS Program (space experiment REAL) . The SUBSA multiple sealed ampoules, tested in a sequence, carry the aluminum/alumina substrates and Al-Si-KxFyAlz braze exposed to a heating/cooling cycle between 70 and ~1100 deg F (21 to ~600 degrees Celsius) in ultra-high purity Nitrogen or a high vacuum. The experiments have been executed at the ISS and returned to Earth for detailed study, including the surfaces topography, microstructure, electron microscopy studies, numerical simulation based on a developed phase-field modeling theory, etc. The study indicates that a combined surface tension and flow conditions may lead to different patterns of phase segregation, various levels of interface dissolution, variable advancing vs. receding contact angles and the triple line locations. |