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

Levitas, Valery I.; McCollum, Jena; Pantoya, Michelle L.; Tamura, Nobumichi

doi:10.1016/j.combustflame.2016.05.012

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

Journal Article · Mon May 30 00:00:00 EDT 2016 · Combustion and Flame

DOI:https://doi.org/10.1016/j.combustflame.2016.05.012· OSTI ID:1379536

Levitas, Valery I. ^[1]; McCollum, Jena ^[2]; Pantoya, Michelle L. ^[2]; Tamura, Nobumichi ^[3]

Iowa State Univ., Ames, IA (United States)
Texas Tech Univ., Lubbock, TX (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)

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.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1379536

Alternate ID(s):: OSTI ID: 1425683

Journal Information:: Combustion and Flame, Vol. 170, Issue C; ISSN 0010-2180

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 11 works

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References (20)

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Impact ignition and combustion of micron-scale aluminum particles pre-stressed with different quenching rates Hill, Kevin J.; Tamura, Nobumichi; Levitas, Valery I. Journal of Applied Physics, Vol. 124, Issue 11 https://doi.org/10.1063/1.5044546	journal	September 2018
The mechanical and thermal responses of colliding oxide-coated aluminum nanoparticles Ma, Bo; Zhao, Feng; Cheng, Xinlu Journal of Applied Physics, Vol. 121, Issue 14 https://doi.org/10.1063/1.4980118	journal	April 2017
Single Particle Combustion of Pre-Stressed Aluminum Hill, Kevin J.; Pantoya, Michelle L.; Washburn, Ephraim Materials, Vol. 12, Issue 11 https://doi.org/10.3390/ma12111737	journal	May 2019
Highly Reactive Prestressed Aluminum under High Velocity Impact Loading: Processing for Improved Energy Conversion Hill, Kevin J.; Pantoya, Michelle L. Advanced Engineering Materials, Vol. 21, Issue 9 https://doi.org/10.1002/adem.201900492	journal	July 2019
Highly reactive energetic films by pre-stressing nano-aluminum particles Bello, Michael N.; Williams, Alan M.; Levitas, Valery I. RSC Advances, Vol. 9, Issue 69 https://doi.org/10.1039/c9ra04871e	journal	January 2019

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