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Title: Stress relaxation in pre-stressed aluminum core–shell particles: X-ray diffraction study, modeling, and improved reactivity

Abstract

Stress relaxation in aluminum micron-scale particles covered by alumina shell after pre-stressing by thermal treatment and storage was measured using X-ray diffraction with synchrotron radiation. Pre-stressing was produced by annealing Al particles at 573K followed by fast cooling. While averaged dilatational strain in Al core was negligible for untreated particles, it was measured at 4.40×10-5 and 2.85×10 -5 after 2 and 48 days of storage. Consistently, such a treatment leads to increase in flame propagation speed for Al+CuO mixture by 37% and 25%, respectively. Analytical model for creep in alumna shell and stress relaxation in Al core-alumina shell structure is developed and activation energy and pre-exponential multiplier are estimated. The effect of storage temperature and annealing temperature on the kinetics of stress relaxation was evaluated theoretically. These results provide estimates for optimizing Al reactivity with the holding time at annealing temperature and allowable time for storage of Al particles for various environmental temperatures.

Authors:
 [1];  [2];  [2];  [3]
  1. Iowa State Univ., Ames, IA (United States)
  2. Texas Tech Univ., Lubbock, TX (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1379536
Alternate Identifier(s):
OSTI ID: 1425683
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Combustion and Flame
Additional Journal Information:
Journal Volume: 170; Journal Issue: C; Journal ID: ISSN 0010-2180
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Levitas, Valery I., McCollum, Jena, Pantoya, Michelle L., and Tamura, Nobumichi. Stress relaxation in pre-stressed aluminum core–shell particles: X-ray diffraction study, modeling, and improved reactivity. United States: N. p., 2016. Web. doi:10.1016/j.combustflame.2016.05.012.
Levitas, Valery I., McCollum, Jena, Pantoya, Michelle L., & Tamura, Nobumichi. Stress relaxation in pre-stressed aluminum core–shell particles: X-ray diffraction study, modeling, and improved reactivity. United States. doi:10.1016/j.combustflame.2016.05.012.
Levitas, Valery I., McCollum, Jena, Pantoya, Michelle L., and Tamura, Nobumichi. Mon . "Stress relaxation in pre-stressed aluminum core–shell particles: X-ray diffraction study, modeling, and improved reactivity". United States. doi:10.1016/j.combustflame.2016.05.012. https://www.osti.gov/servlets/purl/1379536.
@article{osti_1379536,
title = {Stress relaxation in pre-stressed aluminum core–shell particles: X-ray diffraction study, modeling, and improved reactivity},
author = {Levitas, Valery I. and McCollum, Jena and Pantoya, Michelle L. and Tamura, Nobumichi},
abstractNote = {Stress relaxation in aluminum micron-scale particles covered by alumina shell after pre-stressing by thermal treatment and storage was measured using X-ray diffraction with synchrotron radiation. Pre-stressing was produced by annealing Al particles at 573K followed by fast cooling. While averaged dilatational strain in Al core was negligible for untreated particles, it was measured at 4.40×10-5 and 2.85×10 -5 after 2 and 48 days of storage. Consistently, such a treatment leads to increase in flame propagation speed for Al+CuO mixture by 37% and 25%, respectively. Analytical model for creep in alumna shell and stress relaxation in Al core-alumina shell structure is developed and activation energy and pre-exponential multiplier are estimated. The effect of storage temperature and annealing temperature on the kinetics of stress relaxation was evaluated theoretically. These results provide estimates for optimizing Al reactivity with the holding time at annealing temperature and allowable time for storage of Al particles for various environmental temperatures.},
doi = {10.1016/j.combustflame.2016.05.012},
journal = {Combustion and Flame},
number = C,
volume = 170,
place = {United States},
year = {2016},
month = {5}
}

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Works referencing / citing this record:

The mechanical and thermal responses of colliding oxide-coated aluminum nanoparticles
journal, April 2017

  • Ma, Bo; Zhao, Feng; Cheng, Xinlu
  • Journal of Applied Physics, Vol. 121, Issue 14
  • DOI: 10.1063/1.4980118