Breakage Mechanism of Al2O3 Layer on Nano Al Powder by Magnetic Pulsed Dynamic Compaction

Abstract:

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Magnetic Pulse Compaction (MPC), as a dynamic compaction, can be possible to reach higher relative density of nano metallic compacts owing to sufficiently high pressure and adiabatic heating in very short duration of an order of µsec. The present work is concerned with the magnetic pulsed compaction of the nano-sized aluminum powders, which particle size was a range of 50 ~ 100 nm passivated in air. The compaction pressure was 1.5 GPa for 300 µsec in the temperature range from 20°C to 500°C. The grain size of compacts was maintained less than 50 nm, which was analyzed by X-ray diffraction (XRD) using Scherrer method. From the calculation of adiabatic heat and of pressure induced by thermal expansion, and the observation by transmission electron microscopy (TEM), it was found that Al2O3 could be broken and dispersed with a few nano-meter sizes in the Al matrix and that the ultra fine and uniform bulk structure was maintained up to 400°C of compaction temperature.e

Info:

Periodical:

Materials Science Forum (Volumes 449-452)

Edited by:

S.-G. Kang and T. Kobayashi

Pages:

801-804

DOI:

10.4028/www.scientific.net/MSF.449-452.801

Citation:

G. H. Lee et al., "Breakage Mechanism of Al2O3 Layer on Nano Al Powder by Magnetic Pulsed Dynamic Compaction", Materials Science Forum, Vols. 449-452, pp. 801-804, 2004

Online since:

March 2004

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$35.00

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