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Preparation and Reactivity of Gasless Nanostructured Energetic Materials
Published on: April 2, 2015
Dynamic evolution process of multilayer core-shell microstructures within containerlessly solidifying Fe(50)Sn(50)
1MOE Key Laboratory of Space Applied Physics and Chemistry, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China.
Abstract:
Multilayer core-shell structures are frequently formed in polymers and alloys when temperature and concentration fields are well symmetrical spatially. Here we report that two- to five-layer core-shell microstructures were the dominant structural morphology of a binary Fe(50)Sn(50) immiscible alloy solidified under the containerless and microgravity states within a drop tube. Three dimensional phase field simulation reveals that both the uniformly dispersive structure and the multilayer core-shells are the various metastable and transitional states of the liquid phase separation process. Only the two-layer core-shell is the most stable microstructure with the lowest chemical potential. Because of the suppression of Stokes motion, solutal Marangoni migration becomes important to drive the evolution of core-shell structures.
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