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 (Al2O3) 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. Disciplines Aerospace Engineering | Structures and Materials Comments This article is published as Levitas, Valery I., Jena McCollum, Michelle L. Pantoya, and Nobumichi Tamura. "Internal stresses in pre-stressed micron-scale aluminum core-shell particles and their improved reactivity." Journal of Applied Physics 118, no. 9 (2015): 094305. doi: 10.1063/1.4929642. Posted with permission. This article is available at Iowa State University Digital Repository: http://lib.dr.iastate.edu/aere_pubs/94 Internal stresses in pre-stressed micron-scale aluminum core-shell particles and their improved reactivity Valery I. Levitas, Jena McCollum, Michelle L. Pantoya, and Nobumichi Tamura Citation: Journal of Applied Physics 118, 094305 (2015); View online: https://doi.org/10.1063/1.4929642 View Table of