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Title: Internal stresses in pre-stressed micron-scale aluminum core-shell particles and their improved reactivity

Dilatation of aluminum (Al) core for micron-scale particles covered by alumina (Al{sub 2}O{sub 3}) shell was measured utilizing x-ray diffraction with synchrotron radiation for untreated particles and particles after annealing at 573 K and fast quenching at 0.46 K/s. Such a treatment led to the increase in flame rate for Al + CuO composite by 32% and is consistent with theoretical predictions based on the melt-dispersion mechanism of reaction for Al particles. Experimental results confirmed theoretical estimates and proved that the improvement of Al reactivity is due to internal stresses. This opens new ways of controlling particle reactivity through creating and monitoring internal stresses.
Authors:
 [1] ; ;  [2] ;  [3]
  1. Department of Aerospace Engineering, Department of Mechanical Engineering, Department of Material Science and Engineering, Iowa State University, Ames, Iowa 50011 (United States)
  2. Mechanical Engineering, Texas Tech University, Lubbock, Texas 79409 (United States)
  3. Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
Publication Date:
OSTI Identifier:
22494829
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 118; Journal Issue: 9; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM; ALUMINIUM OXIDES; ANNEALING; COPPER OXIDES; EXPERIMENT RESULTS; FLAMES; QUENCHING; REACTIVITY; STRESSES; SYNCHROTRON RADIATION; X-RAY DIFFRACTION