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Impact Ignition And Combustion Of Micron-Scale Aluminum Particles Pre-Stressed With Different Quenching Rates, Kevin J. Hill, Nobumichi Tamura, Valery I. Levitas, Michelle L. Pantoya Sep 2018

Impact Ignition And Combustion Of Micron-Scale Aluminum Particles Pre-Stressed With Different Quenching Rates, Kevin J. Hill, Nobumichi Tamura, Valery I. Levitas, Michelle L. Pantoya

Materials Science and Engineering Publications

Pre-stressing aluminum (Al) particles by annealing and quenching alters dilatational strain and is linked to increased particle reactivity. The quenching rate associated with pre-stressing is a key parameter affecting the final stress state within the Al particle, with faster quenching rates theoretically favoring a higher, more desirable stress state. Micron scale Al particles are annealed to 573 K, then quenched at different rates (i.e., 200 and 900 K/min), mixed with bismuth oxide (Bi2O3), and the Al + Bi2O3 mixtures are examined under low-velocity, drop-weight impact conditions. Both quenching rates showed increased impact ignition sensitivity (i.e., between 83% and ...