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

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

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

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.

Original languageEnglish
Article number094305
JournalJournal of Applied Physics
Volume118
Issue number9
DOIs
StatePublished - Aug 16 2015

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